COLEOPTEKA. 157 strongly arcuate; disk very convex, more so than in splnvricolliK, polished, impunctate. Elytra at base slightly wider than the pronotuni ; sides feebly divergent posteriorly, feebly sinuate near the humeri, arcuate toward the apices, distinctly shorter than the width at base ; broadly and extremely feebly emarginate behind, edges very slightly divergent at the inner apical angles ; sutui'e and scutellum together distinctly longer than the pronotum : disk depressed, polished, impunctate except a row of very feeble distant punctures near the exterior edge ; color paler along the base and apices. Scutellum broader than long, rather small, rugulose, angulate behind. First abdominal segment nearly as wide as the contiguous elytra ; sides divergent and very feebly arcuate to the fifth segment which is the widest, and one-fourth wider than the first ; border extremely strong, erect, almost reflexed, abruptly nearly obsolete on the sixth ; surface depressed, polished, minutely reticulate, impunctate. Legs rather long ; tarsi slender, third joint of the posterior slightly less than twice as long as the first two together, first slightly shorter than the second ; claws long, feebly arcuate, appendiculate.
■ Male. — General sexual characters similar to those of the preceding species, the emargination of the sixth segment is, however, much broader, less strong and more transverse at the bottom.
Female.—Unknown.
Length 3.0 mm.
F'ort Gai'laiid, Colorado (Schwarz).
ICasily recognized by its very spherical protliorax, thick dark antennae, and strong abdominal border.
The first joint in one of the posterior tarsi exhibits signs of a transverse lobation, and gives a distinct impression of a 4-jointed tarsus, althougli this appearance is generally not at all observable. 4. A. gracilicornis n. sp. — Form rather slender. Pubescence very sparse, setiform, very long and coarse, erect, testaceous. Color of head and protliorax dark reddish-testaceous ; the same color extends to the base of the elytra and along the suture, remainder of the elytra piceous ; abdomen piceous-black, slightly paler and more pubescent beneath; metasternum dark piceous. remainder of the under surface pale rufo-testaceous ; legs testaceous, femora much darker in the distal half; antennae testaceous toward the base, brownish-fuscous toward tip, last joint not paler. Head moderate ; eyes very small, not prominent ; sides behind them feebly convergent,broadlyroundedattheposteriorangles;transversebehind;interocular surface smooth, impunctate, polished, having a deeply impressed foveate piincture near the point of origin of each supra-antennal tuberculation ; the latter rather strong but short ; just in front of this puncture there is another very small one ; epistoma broadly rounded, sides nearly parallel ; antennae very long, as long as the elytra, pronotum and one-half the head together, rather slender, basal joint much elongated, all the joints much longer than wide, incrassate toward tip, second joint much shorter than the third. Prothorax just perceptibly narrower than the head across the eyes, Cont. Part II. 7 January, 1885.
158 NORTH AMERICAN widest at the middle where it is slightly narrower than long ; sides parallel and feebly arcnate ; anterior and posterior angles equally and rather broadly rounded ; base transverse, just visibly sinuate in the middle, apex very strongly arcuate ; disk almost globular, impunctate, highly polished. Elytra at base distinctly wider than the prothorax ; sides as in crussicornis ; together transversely truncate behind, truncation just perceptibly sinuate near the outer apical angles ; inner angles feebly rounded ; suture and scutellum together distinctly longer than the prothorax ; disk very depressed, without trace of punctures or reticulation, highly polished. Scutellum much broader than long, rather short, strongly granulose. First five abdominal segments increasing arcuately and very gradually in width, first as wide as the contiguouselytra and rapidly constricted toward the base; segments three to five almost equal in width, posterior edge of the sixth broadly sinuate dorsally ; surface depressed, polished, impunctate, not reticulate ; lateral border very strong but less so than in the preceding species, abruptly much more feeble on the sixth segment. Legs long ; femora robust ; tibiae distinctly arcuate ; third joint of the posterior tarsi twice as long as the first two together, very slender, first joint much shorter than the second. Mule. — Sexual characters of the same nature as in the preceding species, refU'xed arcuate emargination of the sixth segment very strong and more ar(;uate than in crussicornis: eighth segment less strongly impressed, laminae of seventh much less convergent behind.
fi'inale.—Unknown.
Length 3.3 mm.
California.
tlasily distinguisiied from crassicorni's by its much lon<];er and more slender antennae and le.ss strongly developed abdominal border; from spha-ricollis it differs in the antennae, conformation of the abdominal border, much blacker abdomen, size and structure of the pronotum wliicli in splicer icoll Is is gradually, though very feebly narrowed posteriorly.
5. A. "brevipennis n. sp. — Form rather slender. Pubescence sparse and fine, coarser and more herissate on the abdomen, testaceous. Color of head, prothorax, elytra and first five segments of the abdomen rather pale reddish-testaceous ; abdomen and elytra slightly darker than the head, last three segments dark piceous-brown ; under surface and legs yellowish-testaceous,except the metasternum which is darker ; antennae pale testaceous, almost uniform throughout, terminal joint slightly paler than the penultimate. Head robust, dejiressed ; eyes very small, about three times their length from the posterior angles, very slightly prominent ; sides behind them nearly parallel and strongly arcuate ; broadly and transversely truncate behind and rather strongly sinuate in the middle; upper surface highly polished and impunctate; supra-antenual tuberculations rather strong, much elongated, rather strongly convergent posteriorly; between them and before the middle of the disk there is a small well-marked puncture; punctures at the points of origin wanting; antennae slightly shorter than the head,
COLEOPTEKA. 159 prothorax and elytra together, all the joints elongated, basal joint as long as the next two together, second shorter than the third, eleventh nearly cylindrical.Prothorax small, much narrower than the head, widest at the apical angles where it is distinctly broader than long ; sides feebly convergent posteriorly, sinuate in the middle ; anterior angles acutely rounded, posterior very broadly so ; apex broadly and moderately arcuate, base truncate and just perceptibly sinuate in the middle; disk highly polished and impunctate, very convex, more so anteriorly than posteriorly. Elytra at base distinctly narrower than the head and slightly wider than the prothorax ; sides feebly divergent posteriorly, much shorter than the width at base, evenly and feebly arcuate ; together broadly, angularly and extremely feebly emarginate behind ; inner apical angles not rounded, outer very acute and well-marked ; suture and scutellum together equal in length to the protho- I'ax ; disk highly polished and impunctate. Scutellum very small, rounded behind. Abdonninal segments increasing arcuately and gradually in width to the fourth which is very slightly wider than the fifth, first as wide as the contiguous elytra ; border very strong, thin, nearly vertical, slightly less strong on the fifth, feeble on the sixth segment ; surface highly polished and impunctate. Legs slender, uniform in color tViroughout; tarsi slender ; claws moderately long.
Mule. — Sexual luodifications of the same character as in the preceding species, the edge of the emargination of the sixth segment being much less strongly reflexeil, longer, more feeble in curvature, and having the emarginationof the membranous portion much stronger and less transverse ; seventh segment deeply impressed, with no appearance of the lateral arched laminae, the edges of the impression being in the form of rounded ridges ; eighth deeply impressed, acute at tip.
Female.—Unknown.
Length 3.0 mm.
Louisiana, 1.
Tlie above type is very distinct in all of its characters and cannot be confounded with any other species of the genus.
6. A. analis Lee. — Form somewhat robust. Entire body, legs and base of the antennae pale testaceous ; head more reddish ; last three segments of the abdomen above and beneath and the metasternum piceous. Pubescence consisting of a few widely scattered long erect setae which are more sparse on the head and pronotum. Head rather large, depressed, moderate in size ; eyes scarcely prominent; sides behind them feebly convergent and arcuate; broadly truncate behind ; posterior angles broadly rounded ; upper surface highly polished and impunctate ; supra-antennal tuberculations rather narrow,strong, elongated and parallel; surface between them feebly and evenly coiivex, having in the middle an elongated and prominent puncture; no puncture at the posterior extremities of the tuberculatijns ; antennae but very slightly longer than the head and prothorax together, slightly infuscate toward tip, basal joint scarcely as long as the next two together, second much shorter than the third which is slender and nearly twice as long as the fourth, joints rather abruptly thicker after the fourth, eleventh most robust,
160 NORTH AMKRICAN obtns<^ at tip. Prothorax but slightly narrower than the head, widest at the apex where it is very sliglitly wider than long ; sides very feebly convergent posteriorly, feebly sinuate just behind the middle ; apical and basal angles nearly equally and rather broadly rounded ; apex broadly and evenly arcnate, base truncate, feebly sinuate in the middle ; disk rather strongly convex, very slightly more so than tlie head, highly polished and impunctate. Elytra at base as wide as the head and distinctly wider than the contiguous prothorax ; sides moderately divergent posteriorly, nearly straight near the humeri, strongly arcuate near the apices, slightly shorter than the basal widtii ; together broadly and just perceptibly emarginate behind ; inner apical angles feebly rounded ; suture and scutellum together nearly onethird longer than the pronotum ; disk highly polished and impunctate, with a slight indication of very faint sutural striae which become stronger and widely divergent at the scutellum. Scutellum transverse, short, triangular. Abdominal segments increasing arcuately and rather gradually in width, lirst slightly wider than the contiguous elytra; border strong, nearly vertical, thin, becoming narrower posteriorly, suddenly very strongly convergent on the sixth segment ; surface highly polislied and impunctate. Legs n)oderate in length, slender throughout, not clouded with darker tint. Mule — Emargination of the sixth segment one-half as long as the edge, strong, broadly angiilate at the bottom, edge scarcely reflexed except toward the ends of the emargination which are produced backward in the form of two long parallel porrected horns, the latter concave on their inner faces, the concavity extending under the emargination ; the horn-like projections are membranous and very thin ; the thin membrane is also broadly and roundly emarginate. Seventh segment deeply impressed in the middle, margins of the impression broadly rounded, not having tliin laminae, impressionextending without break and with equal intensity to the eighth segment which is acute behind.
Female. — All the segments normal.
Length 2,S-3.0 mm.
Calilorniu and Arizona, 11.
The above description was taken from Dr. LeConte's type which is a female; the male differs slightly in its larger head, in the absence of the median puncture, and in the slightly shorter elytra ; it also has the anterior angles of the pronotum distinctly more acutely rounded tlian tlie posterior. It also differs in tlie antennae, the basal joint of wliicli is fully as long as the next two together and is much more strongly clubbed.
The very singular sexual characters of this species are different from tliose of any other in the genus and will identify it at once. It will be seen that besides the characters given in the table for separating the species into two divisions according to the size of the head, shape of tiie jjronotiim, and siiape ot the femora, there is a fourth of perhaps more importance tlian any of tliem, viz. : tlie lack of the
COLEOPTERA. 101 arclied laminae of the seventh segment in the males ot the second division.
7. A. stilicoides Lee. — Form rather slender ; castaneous, abdomen darker. Head and prothorax glabrous, strongly and minutely granulose, almost opaque ; elytra and abdomen clothed rather densely with very short fine recumbent pubescence, less strongly ga-anulose, feebly shining. Head robust ; sides parallel and arcuate behind the eyes ; posterior angles acutely rounded ; upper surface longitudinally impressed near the very short and prominent antennal tuberculations, just behind which there is a very small and distinct puncture on each side ; in the middle of the disk there is a very short and somewhat feeble canaliculation ; epistoma strongly produced and arcuate anteriorly ; antennae very short and robust, infuscate toward tip, last joint short, most robust, conoidal. Prothorax very small, trapezoidal, widest at the apical angles ; sides nearly straight ; disk scarcely more convex than the head ; base squarely truncate ; anterior angles rounded, posterior obtuse and very slightly rounded. Elytra at base wider than the prothorax ; sides rather strongly divergent posteriorly, sinuate near the humeri, feebly arcuate toward the apices, slightly shorter than the width at base ; almost transversely truncate posteriorly ; much longer than the prothorax. Scutellum very small, broadly rounded behind. Abdominal segments rapidly and arcuately increasing in width ; border very strong. Legs and tarsi slender, third joint of the latter much less than twice as long as the two preceding together.
Male. — Emargination of the sixth segment very small, scarcely one-eighth as wide as the segment, feebly curvate, edge very narrowly and feebly reflexed ; seventh and eighth segments scarcely modified, the former slightly flattened.
Female.—Unknown.
Length 2.0 mm.
Florida (Baldwin and Enterprise), 2.
The characters of this species differ so strikingly from those of anyother, that it may after careful dissection necessitate the creation of a subgenus. The feeble sexual characters, narrow and prominently arcuate epistoma, granulate surface, and short terminal joint of the maxillary palpi are characters foreign to the remainder of the genus. These may be accompanied by others, of a structural nature in the oral organs, of more positive value.
The longitudinal elevation at the anterior portion of the pronotum is excessively feeble, and is obscurely triple, the ridges being separated by very broadly rounded feeble impressions. The elytra and abdomen are not punctulate, but obsoletely granulate. The sexual characters are not exposed to view in Dr. LeConte's type, the other specimen is a male and is the one above described.
162 NORTH AMERICAN PTILIUMT Erichs.
P. flin^icola n. sp. — Form elongated, nearly as in Collnni. Color above piceou.s-ljhuk, iieneath very slightly paler ; oral organs, legs and parts of the prosternum pale reddish-flavate ; antennae black, basal joints paler. Pubescence rather abundant, cinereous, short. Head two-thirds wider than long, sub-triangular ; sides distinctly sinuate at the antennae ; eyes large, rather prominent ; interocular surface shining, very feebly finely and evenly tuberculate ; antennae slightly longer than the head and prothorax together, slender, third joint narrowest, two-thirds as long as the fourth, joints four to eight cylindrical, nearly equal, ninth slightly thicker, tenth and eleventh much more rol)ust, slightly flattened, eleventh distinctly longer and slightly more robust than the tenth ; basal joints equal, slightly elongated, dark flavo-testaceous. Prothorax widest very slightly behind the middle where it is slightly wider than the head, and three-fourths wider than long; sides evenly and rather strongly arcuate ; apex slightly shorter than the base, both very feebly broadly and equally arcuate, the latter feebly sinuate in the middle ; anterior and posterior angles rounded ; disk distinctly longer than the head, rather strongly convex, evenly and rather coarsely tuberculate, tubercles round, flattened and generally distant by their own widths. Scutellum rather large, triangular, roughly asperate. Elytra at base very slightly narrower than the pronotum, widest at the middle where they are slightly wider than the same ; sides evenly and distinctly arcuate ; together somewhat abruptly and obtusely rounded behind ; inner apical angles feebly rounded ; disk two-fifths longer than wide, convex, apex scarcely paler, evenly strongly and coarsely asperate, having almost an imbricated appearance, very slightly more than twice as long as the pronotum. Legs somewhat slender, translucent: tarsi excessively slender; posterior coxae well separated. Length 0.4;') mm.
Pennsylvania, near Philadelphia, 27.
Common in decaying funsri fjrowinjj amonjist fallen leaves in tiie woods. The abdomen in all tlie specimens wliieli I have collected is stronjjly retracted, so that it comes very far from attaining even the tips of the elytra. Tiie species appears to approximate very closely to P. CoUani Miikl., and differs as far as 1 can determine without having seen specimens of that form, in its mucii smaller size, relatively longer protliorax, black antennae, and coarser sculpture. On comparing it with the figure of CoUani given by Mr. Matthews, the following difi'erences are observable : — Tlie elytra in the figure are nearly three times as long as the pronotum and tiie apex of each is more bioadly rounded, especially at the inner apical angles; the pronotum appears to be nearly twice as wide as long, and its disk is seen tti \n\ nnu'h more finely antl closely tuberculate.
I have selected one of the larger specimens for measurement, and many of tliem are scarcely more than 0.38 mm. in length.
COLEOPTEUA. 103 P. triincatuin n. sp. — Form short, broad; sidos nearly parallel; rather depressed. Color throughout piceous-hlack ; pubescence sliort, not dense, sericeous, pale fulvo-cinereous ; integuments polished. Head large, twice as wide as long ; anterior margin strongly arcuate between the antennae;eyeslarge,prominent;interocularsurfacebroadlyconvex,smooth, excessively finely punctulate at the bases of the hairs ; antennae distinctly longer than the head and prothorax together, strongly geniculate, black except the two basal joints which are dark piceous-brown ; second joint more than twice as long as wide, cylindrical, third much more slender, shorter than the fourth, joints four to eight gradually decreasing in length and very slightly increasing in thickness, ninth distinctly thicker andJonger than the eighth, joints of club increasing rapidly in length and thickness, eleventh somewhat abruptly enlarged at the base, much elongated, nearly as long as the two preceding together, somewhat pyriform. Prothorax widest just behind the middle, where it is about one-half wider than long and but very slightly wider than the head ; sides moderately arcuate ; apex very slightly sliorter than the base, the former broadly and extremely feebly arcuate, the latter transverse and extremely feebly sinuate in the middle ; posterior angles obtuse and very slightly rounded ; disk moderately convex, smooth, extremely narrowly margined at the base and sides, polished; hairs growing from very minute ev^enly distributed and sparse punctures. Scutelluni rather large, finely asperate, equilatero-triangular. Elytra at base as wide as the contiguous pronotum, widest at two-thirds the length posteriorly, where they are conjointly slightly narrower than long and as wide as the pronotum ; abruptly truncate behind, outer angles rounded, inner extremely slightly so ; disk moderately convex, finely evenly irregularly and somewhat closely asperate, shining, about four-fifths longer than the pronotum. Abdomenextending slightly beyond the elytra, very short in comparison with the metasternum. Legs rather robust ; femora reddish-brown ; tibiae and tarsi paler and more flavate ; posterior coxae strongly laminate, rather widely separated ; epipleurae of pronotum finely and distinctly rugulose. Length 0.(3 mm.
Pennsylvania, near Philadelphia, 1.
Found in the same locality as in the preceding. It appears to resemble P. Knnzei slightly in form. It is as far as I can determine very distinct by reason of the large eyes, very broad head, polished integuments and more particularly in the curious structure of the antennae because of which it may have to be generically separated. TRICHOPTERYX Kirby.
T. radicola n. sp. — Form very robust, convex. Color above black; legs, coxae, oral organs dark reddish-testaceous ; antennae piceous-black, basal joints testaceous ; pubescence very sparse, recumbent, short, pale piceo-cinereous. Head large, much more than twice as wide as long; sides convergent and deeply sinuate over the bases of the antennae ; anterior margin truncate in the middle, rounded at the anterior angles ; interocular surface evenly convex, highly polished and impunctate ; eyes rather small,
104 NORTH AMERICAN not prominent, more visible from beneath than above ; labrum rather large, concealed from above, strongly inllexed, wider than long, truncate at tip where it bears four or five short setae ; antennae about as long as the width of head, rather slender, club moderate, basal joint longer and more robust than the second. Prothorax large, just visibly wider at apex than the head, four-fifths wider posteriorly, widest slightly before the base where it is about twice as wide as long ; anterior margin transverse, posterior broadly emarginate, transverse and straight in the middle of the emargination, sinuate toward the posterior angles which are rather strongly produced and very acute; disk very convex, polished, very finely feebly and transversely strigose. itnpunctate except the rather conspicuous pores for the reception of the bulbous roots of the hairs. Scutellum large, triangular, wider than Ion";, asperate. Elytra widest in the middle where they are distiiu-tly iKirrower than the pronotum ; sides parallel and just visi))ly arcuate; conjointly abiuptly truncate behind, truncation broadly arcuate ; inner apical angles very slightly rounded ; disk but very slightly longer than wide, about twofifths longer than the pronotum, moderately convex, rather coarsely somewhat strongly and distantly asperate, shining. Legs rather short ; femora robust, compressed ; tarsi extremely slender ; anterior coxae large, nearly globose ; anterior tibia having at the tip several fine slender interior spines. Abdomen very short, basal joints concealed under large transverse lamellar extensions of the posterior cttxae ; pubescence long and fine. Length 0.8 mm. Milf'ord, Delaware, 1.
I found this spec-imen running amongst the roots of" grass in a dense turf. It appears to be distinct troni ifhibricuUls, the only described species with which it can be compared, as in that species the elytra are widest behind the middle and are shorter than the head and prothorax together, while in the present form the elytra are widest if anything before the middle and are slightly longer than the head and prothorax together; the antennae are fiavate in f/hibn'col/is wliicl^ is not the case in rndicola. The sides of the prothorax are much less arcuate than in the figure of glahriruIUs given by Mr. iNIatlhews, and the sides of the elytra are much more convergent posteriorly through the apical half.
The abdomen in the type is very much drawn up so that the tip scarcely attains the elytral apex, and the light shining through the lateral portions of the latter is of a |)ale flavate color ; I do not think, however, that the tip is actually paler. The same translucency is seen in the thin posterior angles of the pronotum, whi(;h are conse- (pu-ntly paler and fulvous.
T. fllllgiiillH n. sp. — Form robust, oldong ; sides parallel ; rather convex. Color above ])iceous-black, elytra becoming rufo-piivous toward the tips which are margined with fulvous ; under surface of the alidomen, legs, coxae, oral organs, and basal joints of the antennae rather dark piceo-testa-