21 ('. BorelUi Giglio-Tos. This insect was described as Prosarthria BorelUl by Giglio-Tos (Boll. Miis. Torino, Vol. IX, No. 184, p. 4, 1894.) It probably occurs in the region embraced in the territory of Formosa.
C. Calzana Giglio-Tos. Caiza, in Bolivian Chaco, adjoining the northern iDortion of Argentina. (Giglio-Tos.) C. caUiuLKs Jiuviw. Northern Argentina. (Burmeister. ) C. oWi-^sa Giglio-Tos. Provin'::;e of Jujuy. (Giglio-Tos.) C. w«r/;;« Giglio-Tos. Province of Jujuy. (Giglio-Tos.) (J. gigantea G\g\\o-^os. Province of Jujuy. (Giglio-Tos.) ('. teretmscula Brunner. Resistencia, Chaco. (Gigiio-Tos.) ('. lancea Burm. Entre Rios (Burmeister); Cordoba. (Collection P. Schulz and H. Stempelmann. ) ('. luieata Brunn. Mendoza in La Plata (Dohrn's Collection.
) SUB-FAMILY TRYXALINAE.
The insects belonging to this sub-family are much more numerous than are those of any of the preceding sub-families ; and, in some instances, become sufficiently numerous to warrant their being classed as destructive. In Argentina we have so far found species which belong to the genera named in the following table for their separation. Several of these genera are herewith described for the first time, while a few of the species also are made known to science in this paper, they not having been recorded or described by any former writers.
TABLE FOR SEPARATING THE GENERA.
A. Foveohi? of vertex below or absent. Faee usually very oblique, b. Antenna' with the joints depressed, more or less ensiforui. e. Wings of male more or less broadly fenestrate, d. Sides of the fastigium strongly rounded, the apex not acuminate. Tegmina acuminate or decidedly obliciuely truncate. Posterior femora with the apical angles horizontally ])roduced, acuminate, e. Head conical: face moderately obliipie. Foveohc of the vertex indistinct, triagonal.
f. Vertex longer than the eyes. Tegmina of male broader than thelength of the pronotum. Winu's of male vcrv broadly fenestrate. HYALOPTEHVX Charp.
22 ft. Vertex shorLer than the eyes. Tegminaof male narrower than the length of pronotum. Wings of male less Ijroadly fenestrate, g. Tegmina obliqnely truncate at apex; wings hj'aliue and more or less infiisc-ated. Pronotum with the lateral carin;>? continuous uninterrupted, h. Larger, general color green.
31 ETA LEFT E A Brunner.
hh. Smallei", general color testaceous or ferruginous. OKPHULA Stal.
gg. Tegmima acuminate, wings tinted with dilute red. Pronotum with the lateral carina- interrupted. EUTKYXALIS Bruner.
dd. Sides of the fastigium straight or but gently rounded, the apex more or less acuminate. Temina broadl}' rounded or somewhat truncate. Posterior femora with their angles roundly detiexed.
e. Fastigium of the vertex above depressed; without a longitudinal carina, f. Lateral carina' of pronotum more or less converging near the middle. The sides of pronotum compressed: tegmina and wings fully developed, g. Wings tinted with yellowish-brown: the tegmina rather broad. ' PAKOHPHULA Bruner.
gg. Wings transparent, sometimes more or less infuseated: tegmina narrower.
ORPHULELLA Giglio-Tos.
ff. Lateral carin;e of pronotum not converging near the middle. The sides of pronotum not compressed. Tegmina and wings usuallv more or less abbreviated. DICHROMORPHA Morse.
ee. Fastigium of the vertex above rounded, provided with a longitudinal carina.
f. Wings with the anterior ulnar vein bi'anched at base. Antenn;v long, clavate in the male. Wings red and black. TOXOPTERUS Bolivar, ff. Wings with the anterior ulnar vein not branched at base. Antenua> long, not clavate in male. Wings hyaline, more or less tinted with carmine at base. FENESTRA Brunner.
cc. Wings of male not fenestrate, the adial veins not incrassateand constricted on apical third. Pronotum with lateral carina^ gentl.y diverging posteriorily: and with a pair of supplemental carina' on disk. Antenna' sub-ensiform. Front stronglv oblique _ SIXIPTA "Stal.
bb. Antenna? filiform. Lateral carina? of pronotum parallel; supplemental carina' absent. AMBLYTRDPIHIA Stal. AA. Foveohe of vertex visible from above, always present. Face usually more nearly vertical than in the alternate category, b Inner apical spurs of hiud tibia' subeipial in length. Antenna' at least of male nearly or quite as long as hind femora, c. Wings colored. Basal joints of antenn:e depressed. Lateral carina' of pronotum converging toward the middle. Tegmina without trace of intercalary vein.
DICHROATETTIX Bruner.
23 ce. Wings transparent. Basal joints of antenna' not depressed. Lateral carina' of pronotnni nearly parallel. Tegmina with the intercalary vein more or less plainly developed. STAUKORHECTUS Giglio-Tos.
bb. Inner apical spurs very une<iual in length. Antenna' of neither sex anywhere near as long as hind femora, c. Lateral "foveohv of the vertex well developed, once antl a half to twice as long as broad. The lateral lobes of pronotum fiirnislied with a rather broad, smooth raised, light-colored carina a little below the middle. STIKAPLEUKA Scudder. cc. Lateral foveola^ of vertex obscure, linear. J^ateral lobes of pronotumwithout raised line or carina, d. L rger. Lateral carin.-e of pronotum more or less interrupted between anterior and posterior sulci: divertjing strongly anteriorly and posteriorily. PLECTROTETTIX AIcNeill. dd. Smaller. Lateral carina' of pronotum but little or not at all interrupted: diverging but little.
EUPLECTKOTETTIX Bruner.
GENUS HYALOPTERIX, CHARP.
TABLE FOR SEPARATION OF THE SPECIES.
A. Size large. Pronotum behind distinctly angulate, lateral carina' continuous, straight. Wings with the posterior field red, in male the anterior field broadlj' tlilated, the anterior margin distinctly rounded, the fenestrate area very l)road. Tegmina of male broader than the length of pronotum. Last ventral segment of male a))domen long. riiripeiiiiis Charp.
AA. Size small. Pronotum behind rounded to roundly angulatetl, lateral carina' not continuous, being more distant on posterior than anterior lobe. Wings entirely subhyaline, the fenestrate area of male less wide. Tegmina of male narrower than length of pronotum. Last ventral segment short. gTacilis Giglio-Tos. H. rufipennis Charp. Perhaps this insect occurs in northern Argentina, although not definitely recorded from the immediately adjoining regions.
H. grdcins Giglio-Tos. San Lorezo, Jujuy (Giglio-Tos.) GENUS METALEPTEA, BRUNNER.
I\f. hrevicornis Linn This insect is found throughout the Republic north of the Rio Colorado, especially along the eastern border. (Schulz, Stempelmann, Thomas, etc.) Jujuy. (Giglio-Tos.)
GENUS ORPHULA, STAL.
0. jKigana Stal. Formosa, Chaco and Asuncion. (Brunner, Schulz.)
24 GENUS EUTRYXALIS, N. G.
This generic name is suggested for the insect described, by Giglio-Tos as Metaleptca m'nwr and another one which is described herewith as EutryxaUH sfrigafa. The members of this genus differ chiefly from those of MetaJeptea by the characters mentioned in the table for the separation of the genera of the sub-family Tryxalinae.
Ell. minor Giglio-Tos. Bolletino dei Musei di Zoologia ed Anatomia comparata della R. Universita di Torino, Vol. XII, No. 302, jD. 23. (Collections of Schulz, Stempelmann and Thomas. ) Common throughout the provinces north of the Rio Colorado, and quite variable in color.
En. sfrigata, n. sp.
Several specimens of an insect that seems to be distinct from the E. ininoi- G.-Tos were taken at Carcarana. These specimens are of about the same size as that species but differ in having the body somewhat slenderer ; and the legs and body much more sharply carinated, also in being alternately dark brown and light tetaceous striped and streaked, these streaks extending from the tip of the vertex to the apices of the tegmina, femora, and abdomen. On the occiput is a central, narrow line of testaceous bordered on either side by one of dusky, followed by a light, again bordered by dark, almost black, then light, after which follows a dusky band, then a light one which is continuous upon the lateral carinae of pronotum and passes to one of the principal veins of tegmina. Below this is a dusky stripe followed by a light one, then by a dusky, again by a light and dusky, then the lower margin of cheek and lateral lobe of pronotum broadly light testaceous. In like manner the face with all of the carinae are light, the interspaces dark ; the carinae of legs light, the interspaces dark ; tegmina with all the principal veins bordered narrowly by dark, with the intersi3aces or fields yellow.
Length: Female, body 27mm; pronotnm 4.75 mm; tegmina 21 mm; hind femora 14 mm; antennae 7mm.
25 GENUS PARORPHULA, N. G.
Body more or less compressed, antennae in both sexes "with the basal joints flattened, siibensiform in the female, a little longer than (male) or about as long as (female) head and thorax combined : the vertex between the eyes about as broad as the smaller diameter of the former, horizontal, with shallow depression surroundined by rounded walls; angle of fastigium a little less than a right angle; lateral foveolae not visible from above, elongate triangular; frontal costa quite prominent between the antennae, rather broader than diameter of basal joint, sulcate throughout; pronotum with the median carina heavy, subcristate ; the lateral carinae well defined throughout, the three cut by last transverse sulcus a little in advance of the middle, posterior margin angulate; tegmina and wings fully developed, the apex rounded : hind femora moderately stout, in the male surpassing, in the female about reaching, the apex of abdomen; -hind tibiae with from 11 to 18 spines in outer row. In general appearance the insects of this genus resemble some of the larger forms belonging to the genus Orpltulella in North America, but on account of their subensiform antennae, infuscated wings, and well develojjed median carina of the pronotum, they api3roach more closely to the genus Or pin (1(1.
TABLE FOR SEPARATION OF SPECIES.
A. General color more or less green. gTaiiiinea Bruner. AA. General color testaceous and brown.
Ij. The upper portion of pronotum and tegmina pale. pallidiiiota Bruner.
111). Fntii'e body more or less varied with pale and dark streaks. Striji'ata Bruner.
Fig. 7. — Parorphula graminea, female, and top of head and |)roiiotuni.
26 P. (rrdiinnea n. sj).
General color of head, pronotum, sides of thorax, and tegmina grass green varied with brown and testaceous; pronotum with the median carina subcristate, especially in front; lateral carinae nearly parallel to the transverse sulcus behind which they diverge greatly bo the posterior lateral angles ; last transverse incision a little in advance of the middle, front edge straight, hind edge more than a right angle. Tegmina and wings reaching beyond the abdomen and tip of hind femora in both sexes, with the costal and dorsal edges in male ^ rass green ; discal field more or less dusky, provided with a row of rather large quadrate dark brown spots. Posterior femora with indications of dusky bands. Sides of pronotum and metapleurae provided with diagonal testaceous bands ; hind tibiae tetaceous, inclining to reddish, more or less sprinkled with brownish markings. Length: of body, d' 17mm; ? 25 mm; of pronotum, J* 3.5 mm, + 4.75 mm; of tegmina, d 15 to 17 mm, ? 22 to 24 mm; of hind femora, d^ 11 mm, ? 15 mm: of antennae, d and ? 7.5 to 8 mm.
This insect occurs in rather large numbers on the open camp throughout the provinces of Buenos Aires, Sante Fe, and Cordoba. (From the collections of F. Schulz, H. Stempelmann, and O. Thomas.)
P. [KdHdhioUi n. sp.
Very similar to the preceding in size and form, but dilfering from that species by being dull wood-brown and in having a pale disk of pronotum and dorsal edges of tegmina. Head smaller with less advanced vertex than in the preceding species. The lateral fovelae well marked, — sublinear. Median carina of pronotum less develojjed; the lateral carinae converging gently towards the transverse incision from which point they expand rapidly posteriorly as in the preceding species. Lateral lobes of pronotum Avith a rather well defined black band extending from the front edge backwards to the transverse sulcus where it passes, in part, to
27 the disk above. The discal field with only a faint indication of dusky spots. Posterior femora without indications of dusky band ; the posterior tibiae testaceous with a purplish ting'e towards base. Tegmina considerably narrower than in the preceding- species but little surpassing the tips of the abdomen.
Length: of body, female 24 mm: pronotum 4-4.5 mm; tegmina 19 mm: hind femora 14 mm; antennae 7 mm. Carcarana F. C. C. A. on rather low alklai grounds, comparatively rare.
F. Str'Kjdfa n. sp.
A much slenderer form than either of the tM'O j^receding, with the fastigium of the vertex forming a right angle, and having the lateral carinae of pronotum parallel to transverse incision, from this jDoint to back edge of pronotum somewhat bowed, but diverging as in the other species. Tegmina and wings just reaching the posterior extremity of hind femora which slightly surpass the tij) of abdomen. The characteristic features of this species are the numerous dark and light stripes and bands which adorn the body and wings. General color of insect dull testaceous: occiput with two slender dark lines arising near the middle of fastigium and directed backwards upon the head almost to front edge of pronotum, enclosing a stripe of nearly equal width to fastigium of general color of body : a rather broad strii3e from back edge of eyes to front of pronotum along the upi3er edges of lateral sides of which it continues across this to discal field of tegmina. This stripe also crosses lower half of eyes to face and there separates forming two rather large black bands, giving the face a very peculiar appearance. Below this on the face, cheeks, and sides of pronotum is another rather broader testaceous band which continues as the light costal edge of tegmina. Again below this is an idication of dusky bands relieved by smaller stripes of a light color. The femora and tibiae of all the legs are duskv and have the
28 prominent carinae testaceous; upper portion of abdomen testaceous with dusky markings; abdomen on the sides dusky, venter yellow.
Length : of body, female 22 mm ; of pronotum 4 mm ; of tegmina 17 mm: of hind femora 13.5 mm: of natennae 7 mm.
This insect also occurs upon low alkali grounds in the vicinity of Carcarana F. C. C. A. like the preceding. It is much rarer than graminea. (Anton Kurriger. ) GENUS ORPHULELLA, GIGLIO-TOS.
The insects belonging to this genus are all rather small and very variable in color — so much so, that without a very full series of specimens to study the student cannot construct a table that will definitely separate them. There seem to be at least three well marked forms found within the territory covered by the present paper. They may be determined by the following TABLE FOR SEPARATING THE SPECIES.
A. General color griseous. Tegmiua sprinkled with black dots. b. Size larger. Lateral carinie of pronotum entire, strongly diverging posteriorly. punctata De Geer.
]>b. Size smaller. Lateral carina' of pronotum somewhat interrupted near middle, less stronglj'^ diverging posteriorly. intricata Stal.
AA. General color green. Discal field of tegmina varied with black. eleg-aiis Giglio-Tos.
0. punctata BeGeer. Resistencia, Chaco. (Giglio-Tos.) 0. intricata Stal. Buenos Aires (Giglio--Tos) : Cordoba (Schulz) and other localities.
O. elegans Giglio-Tos. Resistencia, Chaco (Giglio-Tos): Cordoba (Schulz); Tucuman (Bruner. ) GENUS DICHROMORPHA, MORSE.
I), anstralis n. sp.
The collections of Masters Oliver and William Thomas at Carcarana contain several specimens of an insect that without doubt can be referred to the genus Dichroniorpha. These specimens certainly are not specifically identical with the