NORTH AMERICAN COLEOPTERA. 25 fifth equal, sixth and seventh slightly shorter and equal, eighth glohular, ninth very slightly wider than long, slightly longer than the eighth, tenth as long as wide, one-half wider than the ninth, sides nearly straight, eleventh longer than the two preceding together ; maxillai-y palpi very long and well developed, Prothorax widest slightly behind the middle, where it is scarcely more than one-third wider than long ; sides thence very feebly convergent and evenly arcuate anteriorly, merging gradually into the very broadly rounded anterior angles, much more strongly convergent and distinctly sinuate posteriorly ; anterior margin distinctly longer than the isosterior, equally arcuate ; surface evenly convex, very highly polished, strongly punctured, punctures rather variolate, round, separated by from once to three times their own widths, much coarser and deeper in a line along the base, and in two longitudinal lines, extending from the base to the middle, and dividing the pronotum laterally into three equal parts. Elytra at base as wide as the pronotum ; sides rather strongly divergent posteriorly, distinctly shorter than the width at base, evenly and strongly arcuate ; together broadly, roundly, and moderately emarginate behind ; suture slightly shorter than the pronotum ; disk slightly depressed along the suture, feebly, coarsely, and evenly punctulate, punctures round, very feebly impressed, and separatedby slightly more than their own widths ; surface highly polished near the base and exteriorly, excessively minutely granulose and not polished in the neighborhood of the inner apical angles ; in this granulated area the punctures become almost obsolete ; sutural striae very deep. First two abdominal segments slightly broader than the contiguous elytra; surface scarcely shining ; border very strong. Legs moderately long ; first joint of posterior tarsi equal in length to the next two together, and slightly shorter than the last.
Male. — Fifth ventral segment emarginate in^ts middle twelfth at apex, emargination evenly rounded, and about six times as wide as deep ; sixth segment very narrowly and deeply sinuate at apex, sinus two and one-half times as deep as wide.
Female.—Unknown.
Length 1.4 mm.
Cambridge, Mass. ; one specimen.
A very distinct species. The extremely minute granulation of the elytra near the inner apical angles appears to be quite a common character in the genus, and it is undoubtedly the cause of the iridescence seen in iripennis, although in other species it does not have that effect.
In the above-described male, the third and fourth ventral segments are just perceptibly emarginate in the middle at apex, and the surfaces of the third, fourth, and tilth segments appear to be very feebly flattened in the middle.
7. E. iripennis n. sp. — Form somewhat slender. Pubescence long, fine, sparse, sub-recumbent. Color of head and pronotum dark reddishtestaceous, of the elytra castaneous, of the abdomen paler reddish-testace-
20 THOS. L. CASEY.
0113 ; legs paler, antennae scarcely paler. Head moderate, just visibly wider than Itmg ; eyes very small ; interocular surface coarsely, very closely and evenly punctate, punctures round, shallow, sub-variolate, strongly outlined, separated generally by less than one-half their own widths ; antennae moderate, ninth joint scarcely wider than long. Prothorax slightly wider than the head ; widest very slightly before the middle, where it is scarcely one-half wider than long ; sides thence rather strongly convergent and distinctlyarcuate anteriorly, very slightly more convergent and nearly straight posteriorly ; anterior margin just perceptibly longer than the posterior, equally arcuate ; surface strongly and evenly convex, very strongly, finely, and evenly punctate, punctures round, rather deeply and roundly impressed, interspaces as wide as ,the punctures, flat, and highly polished; just behind the middle, and separated by a distance equal to one-third the width of the pronotum, are two short, narrow, deep, longitudinal, and distinctly defined canaliculations. Pllytra at base very slightly wider than the pronotum ; sides rather feebly divergent posteriorly, slightly shorter than the width at base, feebly and evenly arcuate ; together broadly, roundly, and feebly emarginate behind ; suture equal in length to the pronotum ; disk rather convex, extremely feebly and evenly punctulate, punctures round, separated by one and one-half times their own widths, excessively feebly impressed, nearly equal in diameter to those of the pronotum ; surface distinctly iridescent as in Selenophorus ; sutural striae very deep. First two abdominal segments slightly wider than the contiguous elytra ; border very strong ; surface minutely granulose and feebly lustrous. Legs moderate ; first joint of posterior tarsi shorter than the next two together, fourth distinctly longer than the second and third together, second joint longer than the third. Mule.—Unknown.
Female. — Sixth ventral segment rather angularly rounded behind. Length 1.1 mm.
Ross County, Oliio; one specimen.
Tliis little species may be recognized at once by the peculiar shape of tiic prothorax, by the short canaliculations on its dorsal surface, and liy tlie iridescence of the elytra; also by the tarsal structure. It appears to be one of the most well-marked species of the genus. 8. E. texanus n. sp. — Form rather slender. Pubescence fine, rather sparse, niixli'rate in length, recumbent. Body uniformly reddish-testaceous. Head moderate, wider than long ; interocular surface rather strongly convex, somewhat irregularly and sparsely punctured, along the middle usually impnnctate : teeth of labrum nearly twice as long as their intervals asunder ; eyes small ; antennae paler, nearly as long as the width of prothorax, joints three, four, and five equal, sixth joint shorter and thinner, seventh suddenly thicker tlian the third, nearly globular, eighth smaller, globular, ninth very slightly larger than the seventli, transversely oval, joints ten and eleven abruptly much thicker, two-thirds wider than the ninth, equal in width, tenth transverse, eleventh as long as the two preceding joints together, finely acuminate. Prothorax one-third broader than long ; sides parallel and feebly
NORTH AMERICAN COLEOPTERA. 27 arcuate for two-thirds tlie length posteriorly, then rapidly convergent and distinctly sinuate ; anterior angles rounded, posterior very broadly rounded ; disk evenly convex, highly polished, rather distantly, evenly, and finely punctured, punctures round, somewhat feebly impressed, interspaces generally two or three times the width of the punctures. Elytra at base as wide as the protliorax ; sides rather strongly divergent posteriorly, slightly shorter than the width at base, feebly and evenly arcuate ; together broadly and rather strongly emarginate behind ; sutiire about equal in length to the pronotum ; sutural striae fine and close ; disk very feebly punctulate toward the base, toward the apices it becomes almost absolutely impunctate, punctures extremely feebly impressed, separated by twice their own widths. First four abdominal segments equal in width to the contiguous elytra ; sides parallel and slightly arcuate ; border strong ; surface very minutely rugulose, feebly shining. Legs moderate, slightly paler ; first and fourth joints of the posterior tarsi equal in length, first as long as the second and third together. Prosternum rather strongly punctate in its anterior half. Male. — Fifth ventral segment scarcely modified ; sixth segment narrowly, deeply, and triangularly incised at apex.
Female. — Sixth segment rather acutely produced at apex. Length 1.0-1.2 mm.
Columbus, Texas ; three specimens.
The above description was drawn from the female, the male being in very poor condition.
The sexual characters are open to doubt, owing to the extreme difficulty in seeing them, in a satisfactory manner, in the specimens at hand.
9. E. ainericanus Er. — Form moderately slender. Pubescence short, fine, semi-erect, evenly distributed, rather abundant. Color throughout dark rufo-piceous, antennae and legs very slightly paler. Head slightly wider than long, rather large; eyes small; interocular surface evenly convex, strongly punctate, punctures round, sub-variolate, separated by their own widths near the antennae, somewhat more crowded along the middle ; there is usually a very narrowly impunctate line ; supra-antennal tuberculations distinct ; labrum feebly arcuate anteriorly ; teeth rather short and robust; antennae robust, longer than the width' of protliorax, third joint distinctly longer than the fourth, fourth and fifth equal, sixth abruptly much shorter, scarcely longer than wide, seventh more robust, very slightly longer than wide, eighth of equal thickness, globular, ninth transversely oval, much wider than the eighth, tenth as wide as long, two-thirds thicker than the ninth, eleventh as wide as the tenth, as long as the two preceding together, very finely acuminate ; last joint of the maxillary palpi longer than the first two together. Prothorax scarcely one-third broader than long, scarcely wider than the head ; sides sub-parallel and very feebly arcuate for two-thii-ds the length posteriorly, then rather rapidly convergent and very feebly sinuate ; anterior angles rounded ; anterior margin much longer and less arcuate than the posterior ; surface very strongly punctate, punctures
28 TIIOS. L. CASEY.
deeply impressed, separated by their own widths, near the basal angles agglomerated so as to form two distinct erosions. Elytra at base slightly wider than the prothorax : sides feebly divergent posteriorly, feebly and evenly arcuate, nearly as long as the width at base ; together broadly, roundly, and very moderately emarginate behind ; suture as long as the pronotum ; surface finely, evenly, and distinctly punctulate, punctures feebly impressed, round, separated by twice their own widths, becoming slightly more feeble posteriorly ; sutural striae strong, abdominal segments as broad as the contiguous elytra ; border becoming nearly obsolete on the fourth and fifth segments. Legs moderate ; first joint of the posterior tarsi very slightly shorter than the next two together, much shorter than the fourth. Prosternum very strongly punctured in its anterior half.
M,ih. — Fifth ventral segment very broadly and rather feebly emarginate tliroughout its width at apex ; sides of emargination nearly straight, angle at bottom slightly rounded ; sixth segment narrowly and extremely deeply incised at apex, incisure five to six times as deep as wide. Female. — .Sixth segment acutely rounded at apex.
Length 1.2-1.4 mm.
Michigan (Detroit, L. Sup.) 14 ; Cambridge, Mass., 3 ; Washington, D. C, 1 ; Sand Pt., Fia., 1 ; Willets Pt., Long Id., 1 ; Delaware 1. The above description was taken from the male, the female antenna does not seem to differ greatly from that of the male ; the punctation of tlie elytra appears to vary slightly in degree. 111. £. atoniUS n. sp. — Form robust. Pubescence very fine, rather short, very sparse, dark piceo-cinereous, inconspicuous. Color dark piceofuscous, antennae, front of head and legs slightly paler. Head much broader than long ; interocular surface broadly and moderately convex, highly polished, very feebly and distantly punctulate toward the eyes ; broad median line impunctate ; teeth of labrum nearly twice as long as the intervals ; supra-antennal tuberculations rather small ; antennae very slightly longer than the pronotum, joints three to six uniformly and gradually decreasing in length, seventh thicker, very slightly elongated, sub-globular, eightli smaller, globular, ninth very slightly wider than the seventh, broader than long, last two joints abruptly much larger, last as long as the ninth and tenth together; maxillary palpi moderate; mentura broadly and feebly emarginate. Prothorax much wider than long; sides very rajndly divergent and feebly sinuate for a very short distance posteriorly, then parallel and nearly straight for a distance equal to nearly one-half the total length, then strongly convergent to the base and very feebly sinuate ; anterior and poste rior margins nearly equal in length and curvature, feebly arcuate ; posterior angles broadly rounded ; disk highly polished, very feebly, distantly, and irregularly punctulate, punctures very lightly impressed. Elytra at base just perceptibly wider than the pronotum ; sides rather feebly divergent posteriorly, evenly and moderately arcuate ; together broadly, roundly, and moderately emarginate behind ; suture distinctly longer than the pronotum; disk moderately convex, shining, wholly impunctate, more reddish in
NORTH AMERICAN COLEOPTERA. 29 color than the pronotum. Abdominal segments very strongly margined throughont, finely reticulated, feebly convex, somewhat shining. First and second joints of posterior tarsi equal in length, together as long as the last, third joint much shorter than the first. Prosternum impunctate. Male. — Fifth ventral segment very feebly and roundly emarginate in the middle at the apex ; sixth segment narrowly and deeply sinuate at apex. Female. — Sixth segment rounded behind.
Length 1.0-1.2 mm.
Sand Point, Tampa, and Cedar Keys, Florida ; seven specimens. Tlie above description was drawn from a female, the males being defective ; there seems to be very little sexual difference, other than that observed in the abdominal segments, and a slightly more slender form. The species is very distinct and one of the smallest of the genus.
The mentum in Euresthetus is perfectly plane or very feebly undulated on the exposed surface, and is not, like Stenus, ornamented with a very conspicuous triangular cariniform elevation. EDAPHUS Lee.
Dr. LeConte's description of the only species hitherto known in this genus, runs as follows (Smith. Misc. Coll., 'G3-'66, p. 50). £. IlitidllS. — Testaceus nitidus, glaber, laevis capite bi-impresso, thorace latitudiue fere breviore, subcordato postice angustato, ante basin foveis 4 magnis insculpto ; elytria stria suturali vix conspicua. Long .04 (inch). Alabama and Louisiana.
In the course of the remarks made upon this species, the author states that the genus differs from Euaisthetus principally in the smooth impunctured body. Since it is seen tliat we have species of Euaesthetus, which are almost impunctate, more so in fact than the two new species of Edaphus, to be subsequently described, it seems preferable to state the ditierence between Edaphus and Euajsthetus as follows : — In the former the head between the eyes is strongly bi-impressed, the labrum is not provided with teeth, the prothorax has several deep foveae along the base, and the dorsal surface of the first ventral segment has a very narrow acute medial cai'ina throughout the anterior half of its length ; while in Eusesthetus the comb-like row of teeth of the labrum is a very marked feature, the head between the eyes is perfectly even and convex, there is no transverse row of foveae near the base of the pronotum, and the dorsal carina of the first ventral segment is totally absent.
30 THOS. L. CASEY.
If the structure of the abdomen were not noted, it would be almost impossible to distinguish the genus from some of those of the Pselaphida3.
Our tliree species may be distinguished as follows : — Basal thoracic foveae four in number llitidllS.
Basal thoracic foveae six in number.
Prothorax having at the base a very distinct medial carina ; body rather strongly pubescent cariliatllS.
Prothorax having no appearance of the medial carina ; puliescencc very sparse; color pale luculentus.
I have seen no specimen of the first species, and the characters employed rest entirely on the authority of Dr. LeConte. E. carinatlis n. sp. — Form slender. Pubescence moderately close, distinct, sub-recumbent, evenly distributed. Head small, slightly wider than long ; interocular surface with two irregular and well-marked impressions,jwrrected between the antennae, forming a transverse rounded elevation, under which the antennae are inserted ; labrum broadly and feebly angulate anteriorly; antennae slightly shorter than the head and prothorax together, first two joints equal and robust, next three much narrower, slightly longer than wide, sub-equal, joints six to eight shorter, sub-globular, seventh transversely oval, ninth shorter than the eighth, strongly transverse, tenth abruptly more than twice as wide as the ninth, strongly transverse, eleventh slightly wider than the tenth, longer than wide, having a distinct terminal process ; maxillary palpi rather slender, third joint as long as the first two together, fourth not visible ; mentum small, trapezoidal, surface Hat. Prothoraxmuch broader than the head, one-third wider than long ; sides for two-thirds the length from the apex parallel and strongly arcuate, then abruptly convergent behind and sinuate ; anterior angles rounded, posterior acute ; apex much longer than the base, equally and feebly arcuate ; disk impunctate, highly polished, strongly convex ; near each basal angle, and in the middle at the base there is a very acute, short longitudinal carina attaining the basal margin ; between each pair of carinae there are three transversely disposed deep equidistant foveae. Elytra at base as wide as the prothorax ; sides rather rapidly divergent posteriorly, slightly longer than the width at base and feeblj- arcuate ; together broadly and very feebly emarginate behind ; suture one-third longer than the pronotum ; disk convex, very feebly and distantly punctulate ; sutural striae distinct Scutellum excessively small. Abdominal segments as wide as the elytra, very strongly margined, border al)ruptly much narrower, nearly obsolete, on the fifth segment ; surface very convex, highly polished. Legs moderate; first three joints of posterior tarsi decreasing in length, last much longer. Color throughout the body dark red<lish -testaceous, legs paler ; integuments translucent.
Mtilt. — Sixth ventral segment very strongly emarginate at apex, emargination nearly evenly rounde<l, nearly as wide as the entire segment, and alx)Ut two-thirds wiiler than deep ; seventh segment truncate at tii>.
NORTH AMERICAN COLEOPTERA. 31 J-emale.—Unknown.
Lengtli 0.9 mm.
Washington, D, C. (Schwarz).
The carinae of the pronotum are very strong, and will render the species very easily recognizable.
E. lucilleiltlis n. sp. — Form slender. Pubescence extremely sparse, almost totally absent from the pronotum. Head and antennae nearly as in carinatus; labrum very broadly trapezoidal, broadly rounded anteriorly, where it is fringed with very short whitish setae, and also with very long sparse hairs ; third joint of maxillary palpi longer than the first two together. Prothorax wider than the head, one-fourth wider than long ; sides as in carinatus; anterior margin longer and more strongly arcuate than the posterior, which is nearly transverse ; the two carinae at the basal angles are distinct, the middle one is entirely obsolete ; parallel to the basal margin and at a short distance from it, is a row of six very deep distinct impressed foveae ; disk of pronotum impunctate and highly polished. Elytra at the base slightly wider than the pronotum ; sides rather strongly divergent l^osteriorly, longer than the width at base, rather strongly and evenly arcuate ; together broadly, roundly, and feebly emarginate behind ; suture one-fifth longer than the pronotum ; surface moderately convex, highly polished, very minutely, distinctly, and extremely distantly punctulate ; sutural striae distinct and very close ; surface of abdomen extremely highly polished, nearly as in the preceding species. Legs moderate ; first three joints of the posterior tarsi decreasing uniformly and very gradually in length, fourth as long as the two preceding together. Color throughout very pale testaceous, legs paler, last two joints of antennae distinctly darker. Mule. — Sixth segment very broadly emarginate at apex, emargination as wide as the segment, evenly rounded, and very feeble, fifteen to twenty times as wide as deep ; seventh segment rather acutely rounded at- apex. Female.—Unknown.
Length 1.0 mm.
District of Columbia (Ulke).
TYCHIJS.
T. testaceilS n. sp. — Form somewhat slender. Pubescence coarse, erect, somewhat dense and long, shorter on the head and pronotum. Color uniformly reddish-testaceous, integuments translucent. Head, from front of tuberculation to base, longer than the width across the eyes ; interocular surface very convex, smooth, and highly polished ; eyes very small, semicircular; tuberculation large, median furrow very narrow; genae nearly transverse behind the eyes ; antennae as long as the elytra and prothorax together, first joint twice as long as the second, distinctly more robust, second very slightly longer than wide, sub-cylindrical, joints three to eight subequal, joints of club increasing uniformly in width, ninth one-third wider than the eighth, ninth and tenth wider than long, eleventh nearly twice as wide as the ninth, longer than the two preceding joints together, couoidal,
32 THOS. L. CASEY.
abruptly acuminate, very feebly narrowed toward the base; maxillary palpi long, first joint cylindrical, very minute, second at base as wide as the first, much the longest, for three-fifths its length it is very narrow, cylindrical, and bent upward slightly, then suddenly expanding into a flattened, subsecuriform club, third joint nearly one-half as long as the second, strongly flattened and broadly securiform, widest in the middle, fourth joint one-half longer than the third, flattened, strongly securiform, widest slightly behind the middle, where it is three-fifths as wide as long, surface thickly covered with 8hort erect setae, from the immediate apex protrudes a long slender spine ; labrum twice as wide as long, very convex, transverse anteriorly, sides very strongly arcuate and parallel. Prothorax widest in the middle, where it is slightly broader than long and wider than the head ; sides thence very strongly convergent and feebly sinuate anteriorly, rather feebly convergentandnearlystraightposteriorly;anteriormarginthree-fifthsaslong as the base; disk very convex, highly polished, and impunctate. Elytra at l)ase as wide as the prothorax ; sides moderately divergent posteriorly, nearly evenly and rather strongly arcuate ; together broadly and transversely truncatebehind ; suture one-half longer than the pronotum ; disk evenly convex, striae two on each elytra, sutural continuous throughout, medial abruptly ending just before the middle ; surface highly polished, impunctate ; humeri rather liroadly rounded. Abdominal segments arcuately and rapidly decreasing in width, not as long as the elytra, strongly bordered ; surface highly polished. First joint of posterior tarsi very short, second and third of equal length. Length 1.5 mm, Cambridge, Mass.; Trenton Falls, N. Y. ; Ann Arbor, ^lich. (Scliwarz).
Appears to be wklely distributed and not uncommon. Reitter, in the " Insecten Deutschlands," says that the third joint of the maxillary palpi in the genus Tyclius is '"■ very small, scarcely visible." Tiiis is certainly not the case with the North American representatives of the genus, as in all of our species, which I have examined, the third joint is very fully developed, and in 7'. hngipalpus Lee. it becomes nearly as long as the second joint.
BRYAXIS.
B. graciliti n. sp. — Form rather slender. Pubescence very long, rather abundant, erect, setiform, pale fulvo-cinereous, prominent, less dense on the pronotum. Head moderate, length from clypeus to base but very slightly greater tiian width across the eyes, which are small, very prominent, and nearly ht-mispherical ; genae distinct, equal in length to the eye ; interocular surface moderately convex ; the three foveae are at the apices of an equilateral triangle, they are prominent, almost exactly equal, circular, impressed,andspongyatthebottom;antennaeaslongastheheadandprothoraxtogether,firstjointindentedabovetofitthesupra-antennaltubercle, second joint very slightly smaller, remaining joints to the ninth more slender, sub-cylindrical, equal in thickness, ninth slightly larger, very slightly