(5 — 
Antenne somewhat shortened, first joint short....... Bria aa asie : | Nesyetel bis (ooops 3. 
Antenne very long, first joint elongated. 
Scutellum with 5 keels. 
Anterior tibiae longer than the femora and trochanters united. 
Interior ulnar and radial veins of corium of equal length, forked at base..,... 
G. 6. Hygyops, A. et S. 
Interior ulnar vein shorter than the radial, the latter forked at base. ... on 
G7. (\Canyra; Stal. 
Anterontmbicmsionclas bhememOondim ert ete litl erence G. 8, Livatis, Stal. 
Ber cadsbroad erathanuthonaxeacieiy- | aaieleieieisistyeereeleiee G. 9. Amblycotis, Stal. 
Head narrower than thorax or of equal breadth. 
Bit a MOMVEXN alse ciel ce coc Seutaielapere eee rmreneare chavcteretay iets G. 10. Rhinotettix, Stil. 
Elytra flat or somewhat flattened. 
Bostenioritarsisshonter hamster bl bison rivet nsielteei tie ieee eee 8. 
Posterior tarsi as long as their tibize. 
Side keels of pronotum oblique, shortened behind...................-..,. 4. 
Side keels of pronotum attaining the posterior margin, divergent ; frons with 
a median keel. 
Vertex a long isosceles triangle, without grooves or fovez, with a median 
keel extending from one extremity to the other, prolonged beyond the 
eyes nearly half their length ; clypeus with a median keel; basal an- 
tennal joint about one-third the length of second, thick,’° cylindrical ; 
posterior tibize with two spines........ G. 11. Tropidocephala, Stil. 
Vertex elongated, quadrangular, more or less prolonged before the eyes ; 
frons with a median keel biforked on the vertex ; clypeus with a sharp 
median keel; basal antennal joint cylindrical, somewhat compressed, 
two-thirds the length of second which is cylindrical...............- ‘ 
G. 12, Megamelus, Fieber. 
4 Frons with two distinct keels, or else feeble above or nearly effaced, or more or 
less lonelyspeduncleditowardiclypeuss.e tees ene eee ieee eee 6. 
Frons with one distinct median keel, entire or shortened, often scarcely visible. 
Frons with the apex of vertex forming an obtuse angle; vertex pentagonal, 
short, as long as wide at the base ; pronotum short, half as long as wide at 
the base , pronotum short, half as long as the vertex with a median keel ; 
side keels robust when with short elytra, feeble when with elytra well de- 
ni(cle) 91200 eee IRR celle Gere cds 6 G. 13. Delphacinus, Fieber. 
Frons at apex and vertex at apex, truncated ; vertex quadrate or elongated 
nearly trapezoidal. 
Vertex a short isosceles triangle, or transversely quadrangular slightly passing 
Nh i ee ou! POS TGS oniod CoO Donon NRO SoedoM geet 5. 
Vertex quadrangular, elongated or trapezoidal, twice as long as wide, passing 
nearly half or more than half its length before the eyes; first posterior 
tarsal joint much longer than 2 and 3 united, joints 1 and 2 deeply ex- 
cised at the apex, their lobes straight. 
Vertex elongated, trapezoidal, visibly wider at the nape of the neck than at 
the apex ; frons elongated nearly hexagonal, widest about the middle 
Oniatthesapicalisthirdejyecry. esate ete G. 14. Chlorion, Ficber. 
5 Frons with keel entire or forked only at the apex. ). 5... ..0.2 J. seeks ons meee 
G. 15. Delphax, Fabr. (= Liburnia, Stal.) 
