53 been thus far known to do damage to cultivated vegetation or to grasses growing on the pampas will be mentioned in detail under the resjDective species.
TABLE FOR SEPARATING THE GENERA.
A. Posterior Tibirt' provided with an apical spine above iu both margins, b. Fastigium of the vertex horizontally greatly produced. c. Crest of the pronotum serrate throughout. PKIONOLOPHA Stal cc. Crest of the pronotum not serrate or sometimes posteriorih' erenulate, or sometimes cut by the transverse sulci, d. Lateral carina* of the pronotum converging toward the front, e. Carinte of the frontal costa pai'allel or gently diverging above the oee lus.
f. Tegmina and wings complete, erpialing or surpassing the abdomen. TKOPlI>()N<)TUS Serv.
ff. Tegmina and wings abbreviated.
ALCA3IENES Stal.
ee. Carina' of the frontal costa diverging aljove tlie ocellus, dd. Lateral carina- of the pronotum parallel or diverging toward the front. EL.-EOCHLOKA Stal.
bb. P'astigium of the vertex sloping or depressed. c. Wings with that portion just back of the vein which divides the first and second parts dilated and provided with numerous paralleltransverse veins.
d. Fastigium of the vertex subtriangularly acuminate. Frontal costa compressed. Pronotum above rounded: lateral carina obliterated in fi-ont of last transverse sulcus, blunt back of it. KH<)MALE.\ Burmeister.
dd. Fastigium of the vertex obtuse. Frontal costa not compressed or sulcate.
e. Median carina of the pronotum not cristate. f. Head somewhat smooth. Frontal costa above the antennas obtusely sulcate. ZONIOPODA Stal.
ff. Head ru'gulose. Frcmtal costa usually continuous to the clypeus", sulcate. CLAKAZELLA Pict. et Sauss. e. Median carina of the pronotum elevated into a crest which is interrupted by the sulci. TKOPIDACKIS Scudder. cc. Wing with that portion jnstltackof the vein which diviiles the first and second parts not dilated nor provided witli transverse parallel veins. Fastigium of the vertex rounded and fading into the frontal costa. DIPONTIIl'S Stal.
AA. Posterior tibi:e with the a])ical spine absent from the uppei- outer margin, b. Posterior tibi:e more or less flattened toward the apex, the margins acute, c. Mesosternal lobes contiguous nearly throughont in a straight line. (Tegmina acuminate.)
d. Fastigium of the vertex as long or longer than the eyes. e. Fastigium of the vertex with a single deep groove. Interocular space of the vertex verv narrow.
LEI»TVS3I.V Stal ee. Fastigium of the vertex provided wltii four nai-row shallow grooves. The interocnlar space wider.
LEPTVS31INA (iiglio-Tos.
54:
del. Fastiffium of the vertex shorter than the eves. ARNlLIAStal.
ec. Mesosternal lobes more or less distant. Prosterual tubercle conical,somewhatacute, d. Prosternum with the hind margin rounded. Pronotum cjiindrical. when viewed from the side straight above, the metazona not elevated. Frontal costa below the ocellus and lateral carintv of face subobsolete. Eves verv oblique, less prominent. ^ STENOPOLA Stal.
dd. Pronotum with hind margin obtuse-angled. " PAKACOKXOPS Giglio-Tos.
bb. Posterior tibia^ terete, not laminate, the margins rounded, c. Posterior tarsi with the first and second joints subequal in length Fastigium of the vertex horizontal or siibhorizontal, somewhat prominent. The front strongly oblique. Tegmina as long or longer than abdomen. Pronotum sub-cvlindrical. BUCEPHALACKIS Giglio-Tos.
cc. Posterior tarsi with the second joint distinctlv shorter than the first, d. Fastigium of the vertex triangular or in front truncate, divided fi-om the frontal costa by a transverse carina or distinct angle, e. Upper carina of hind femora smooth, f. Interspace between mesosternal lobes narrower than the lobes themselves, distinctly longer than wide. Prosternal tubei'cle conical, the apex acute. Mesosternal lobes in female distiuet. Intel-space of vertex Ijetween eyes not narrower than widest part of frontal costa. ALEUAS Stal.
ff. Interspace between mososternal lobes of about equal width with the lobes themselves, quadrate.
JODACKIS Giglio-Tos.
e. Upper carina of hind femora more or less serrate. Fastigium of the vertex horizDUtally projecting, acuminate, f . Pronotum rugose with the hind margin rounded, the median carina visible throughout. Tegmina and wings somewhat abbreviated. Vertex between the eves moderately broad. A'iLEKXA Stal.
ff. Pronotum at most coarsely punctate on posterior lobe, the hind margin angulate and with the median carina obliterated between the transverse sulci. Tegmina and wings greatly surpassing the abdomen. Vertex between the eyes very narrow. 0S3IIL10LA Giglio-Tos. dd. Fastigium of the vertex cletlexed or horizontal, gently fading into the frontal costa.
e. Mesosternal lobes longer than wide, their internal margin straight. SCHISTOCEKCA Stal.
ee. Mesosternal lobes transverse or of equal width and length, their internal margin rounded, f. Posterior tibia' furnished with eight or sometimes more than eight spines in the outer row.
g. Tegmina equaling the abdomen in length or abbreviate, never lobiform or rudimentary, always with the inner margins overlapping, h. Head small, not exserted, the hind part narrower than front edge of pronotum: occiput and vertex on the same plane with the pronotum.
ATKACHELACKIS Giglio-Tos.
hh. Head larger, distim-tlyexserted, the hiud part as wide or very little narrower than front edge of pronotiiui. i. Pronotuni dilated behind. Cerei of male wiili the apex graceful. DICHHOl'IA'S Stal.
ii. Prouiitinn cvliudrical. Cerei of male broadlj' .spatulate. " SCOTTUSSA Giglio-Tos.
gg. Tegmina lol)iform, lateral, di.stant from one anothei', or meeting above, but never with the edges overlapping. h. Prouotum with the po.sterior edge rounded. Head very large, distinctly wider than the ])Osterior portion of pronotum. Cerei of male, excej)! of base. stvlifoi-m. SCOPAS (iiglio-To.s.
hh. Pronotum with the posterior edge truncate or emargiuate. Head much smaller, not as wide as hind border of pro otum. Cerei of male more or less flattened and curved.
PAKADICHHOPLIS Brunner.
ff. Posterior tibiie generally with less than eight spines, ustisually with six to seven, in outer row. Frontal eosla percurrent. straight, not at all or but little produced between the antenna'. Tegmina and winsjs fullv developed. O'SMlLIAStal.
GENUS PRIONOLOPHA, STAL.
P. serrntd (Linii.) This large locust has been taken in the i^rovinces of Tncuman, Salta, Jujuy and the territory of the Chaco (Gigiio-Tos).
GENUS TROPIDONOTUS, SERV.
TABLE FOR SEPARATING THE SPECIES.
A. Crest of the pronotum more or less erenulate or even serrulate i)osteriorly. Genicular angles of hind femora acixte. a little lengthened, b. Tegmina testaceotis. more or less mottled with brown, e. The markings of tegmina large, forming more or less well-delined l)ands.
d. Hind femora very long, reaching considerably beyond the tip of abdomen in" botli sexes. Crest of pronotum deeply cleft bv all three sulci, the lobes distinctly separated. diiscoideiis Serv.
dd. Hind femora shorter, only reaching the tip of abdomen (female) or but little surpassing it (male). Crest of pronotum less deeply cleft, the lobes closely approximate, e. General color grayish-brown. Tegmina with the markings distinct or apical as well as on basal half. Aiit<Min;r dusky. aiijiulatus Stal.
ee. General color ferruginous ttstaceous. Tegmina with a large triangular spot on l)asal half, the apical portion almost without trace of markings. Antenna* dusky only at tip. Sclmlzi Brniier.
ce. Markings of tegmina small, irregularly scattered over the wing save for a row in basal half of tliscal area, il. Pronotum sliort. the crest low. and but little proiluced posteriorly. Hind tibi;e with nine spines in outer row. iiioclestii.'^ (Jiglio-Tos.
56 dd. ProQotum louger, considerably produced posteriorlj'. Hind tibia? with ten spines in outer row.
conspersiis Brnner.
bb. Tegmiua as well as entire body and legs green, without definite markings. insiguis Giglio-Tos.
AA. Crest of pronolnm smooth posteriorly. Genicular angles of hind femora roimded. Green, varied with dark-brown and Ijlack. laevipe^ Stal.
T. discoideu.'^ Serv. This insect has been reported from both Jujuy and Buenos Aires (Giglio-Tos). Unfortunately the writer has never recognized it.
T. (Dif/u/otufi Stal. Tucuman (GigiioT-os). T. Schulzi n. sp. A rather small ferruginous testaceous insect with short, rather robust hind femora, not greatly elongated pronotum, and with a large dusky spot near base of tegmina. It may be recognized further by its rather short, light colored antennae, the apex only being somewhat dusky: also hj its moderately smooth pronotal crest, the jDOSterior jDortion of which barely shows a trace of crenulation. Hind tibiae with 10 spines in outer row. Length: of body, 2?^ mm: of pronotum 9.5: of tegmina, 24 mm: of hind femora 17 mm.
Only a single male sjDecimen of this insect from Cordoba has come under m.j observation. (Collection F. Schulz). T. iiiodestns Giglio-Tos. Rejjorted from Resistencia, Chaco (Gigiio-Tos).
T. ronftperftn!^ n. sj:).
An insect in which the general color is dull grayish brown, and the markings of tegmina rather small and, save for the row in basal half of discal field, irregularly scattered over the wing. Pronotum rather narrow, the lateral carinae continuous, bluntly tuberculate, especially behind: median carina of moderate height, the posterior portion crenulate. Antennae dusky throughout. Wings with disk red, the costal and axillary fields, along with the hind border dusky. Hind femora .short and robust at base, about reaching the extremity of abdomen in both sexes, the carinae provided with
57 raised blackish tubercles: the outer face and ui)pei' edge with indications of dusky bands. Hind tibiae, glaucocinereous, with Id sjDines in outer row. Length: of body, d' 30 mm, + 48 mm: ofj^ronotum, d 10-11 mm, ? 14-15 mm: of tegmina, d' -o-i^s mm, - oomm: of hind femora, d' 17 mm, '^ !^4 mm.
Specimens have been examined from Cordoba (F. Schulz, H. StemiDelmann). In stature this insect is very similar to T. /iisi(/iiis which follows, and there is a bare possibility that it nvdy prove to be a dusky furm of that species. T. inf<i(/iiis Giglio-Tos. Santa Rosa, Salta (Giglio-Tos): Cordoba (F. Schulz).
7\ laenpe-s Stal. This seems to be the most abundant species of the genus in the Republic, and is found on the open camp, while all of the other species above referred to frequent localities more or less grown ujj with woody plants. Sjjecinjens were taken at Carcarana, Santa Fe (O. Thomas). - Fig. 21. — Tropidonotus laevipes Stal.
GENUS ALCAMENES, STAL.
TABLE FOR SEPARATING TlIK SPECIES.
A. Pronotum tectiforni; the anterior ami iniddlc sulci obsolete above: the posterior lobe longer than anterior. Posterior tibi:e with TJ i;{ spines in outer row. " brovicollis Stal. AA. Pronotum plain above, the median carina nioileratcly elevated: all three of the sulci plain al)ove: the i)osterior lobe shorter than anterior. Posterior tibia' with 8-10 s])ines in outer row. olaraziaiius Pict. et Sauss.
A. brevicollis Stal. Corrientes, Argentina (Stal). .4. clarazlanKs Pict. et Sauss. La Republiciue Argentine (Pict. et Sauss.).
58 GENUS ELAEOCHLORA, 8TAL.
TABLE FOR SEPARATING THE SPECIES.
A. Fastigium of the vertex large. Costal and anal margins of tegmina yellow, bordered internally narrowly with black. b. Tegmina of male but gently narrowing apicallj' where they are broadly rounded. Wings hyaline.
('. Pronotum obsoletely earinated; behind (female) obtuse-angled; male rectangular; tubercles of the sides very small or obsolete. triliueata Serv.
cc. Pronotum very distinctly earinated: behind (female) right-angled or even slightly acute-angled, male frequentl,y acute-angled; lateral tubercles verj' distinct. viridicata Serv. bl). Tegmina of male narrowing apically where they are somewhat acute. Wings with the disk rose-color. picticollis Gerst. AA. Fastigium of the vertex smaller. Costal and anal margins of tegmina concolorous, grass-green. Pronotum short, the hind edge obtuseangled, augustipennis Bruner.
E. trilineata Serv. This insect undoubtedly occurs in northern Argentina since it has been reported from both Bolivia and Paraguay.
E. viridicata Serv. Buenos Aires, Cordoba, Carcarana, etc. (all the collections). At Cordoba a well defined variety of this insect seems to prefer for its food-plant a species of Nicotiana.
E. incticoUis Gerst. San Lorenzo, Jujuy (Giglio-Tos). Elaeochlora angustipeiinis n. sjd.
About the size of E. viridicata but much more slender and with shorter pronotum. General color light olive green with the lower edges and short oblique lateral band of white on pronotum. Fastigium of vertex rather short, but little narrower than the shortest diameter of eyes, acute angled. The pronoum with the anterior margin slightly angulate, posterior margin obtuse angled. Tegmina and wings rather narrow, surpassing the tip of abdomen. Hind femora slender, the posterior tibiae green, the apical inner portion with tarsi red, sjDines on the inner edge large and black: outer ones light colored, black tipped.
Length: of body (male), 40 mm; of pronotum 8.5 mm: of tegmina 38 mm: of hind femora 23 mm.
5 'J A single male specimen collected at Rosario, Santa Fe, by Anton Kurrio'er.
A.
Fio;. 32. — Elaeocldora viridicata (Serv.) GENUS RHOMALEA, BURM.
TABLE FOR SEPARATING THE SPECIES. Wings with l)asal half or more of anterior and axilliarj' fields black. Pronotum with the lower margins incompletely yellow or red bordered, b. Posterior tibia' bifaseiate.
c. The colored bands on the hind lioi-der of ))r()notuin continuoiis. miles Drnry.
cc. The colored bands on hind l)order of pronotum interrupted so as to form four spots, two dorsal and two lateral. Stolli Pict. et Sauss.
l)b Posterior tibiiv obsoletely fasciate. niiptialis (ierst. A A. Wings with basal half of anterior and axilliary liclds colored. Posterior tiljia' uni fasciate. icterus Pict. et Sauss.
60 B. miles Drury, var. a. R.eiDublique x\rgentine (Pict. et Sauss.).
Fig. 23. — Elaeochlora viridicata (Serv. ) — male. Fig. 24. — Rhovialea Stolli Burm — female. B. StoIUBurm. Salta, Jujuy, Resistencia,Chaco, and Buenos Aires (Giglio-Tos): Rosario (H. Stempelmann) ; Cordoba (F. Schulz).
This highly colored insect is very common wherever it occurs, and exhibits a tendency to congregate upon certain plants in such numbers as to completely cover them. The black saltonas with their bright markings of rose color and white render them very consjjicuous objects. Notwithstanding this they seem to be let alone by most insectivorous birds, B. nuptiaUs Gerst. San Lorenzo, Jujuy (Giglio-Tos). B. icterus Pict. et Sauss. Republique Argentine (Pict. et Sauss.).
b.
bb.
AA.
Fig. 25. — Rhomalea Sto li nymph.
GENUS ZONIOPODA, STAL.
TABLE FOR SEPARATING THE SPECIES.
Body gi-eeuish olivaceous: the tegmina of same coloi-, uniform; the wiugs basally and on disk light l)lue. The femora and tibia^ all banded with black. tarsata Serv. Femora and tibiie not banded, the latter all red. juiicoi'Uin Berg.
Body varied with black. Pronotum vittate. Tegmina with interspaces between principal longitudinal veins fuscous. oniulcolor Blanch.