SCUDDER. — NORTH AMERICAN TRYXALIN2B. 49 



c 1 . Hind margin of pronotum more angulate than front margin ; posterior 

 margin of lateral lobes straight ; tegmina and wings fully developed. 



Plat ybothrus Scudd. 

 c 2 . Fore and hind margins of pronotum equally (and slightly) angulate; pos- 

 terior margin of lateral lobes sinuate ; tegmina abbreviate and wings aborted. 



Bruneria McNeill. 

 a 2 . Antenna) apically clavate Gomphocerus Thunb. 



Horesidotes (wpeai^dr-ns) gen. nov. 



Allied to Napaia McNeill (which I have not seen) and separable from 

 it in the points mentioned in the above table. Head subpyramidal, the 

 face considerably oblique and straight; occiput with a median carina 

 extending to and invading the fastigium of the vertex and throughout 

 accompanied proximately by a pair of similar supplementary carina? ; 

 foveola? visible from above, elongate, shallow; eyes rather elongate; 

 antennae subfiliform, a little depressed but only feebly expanded basally, 

 moderately slender, a little longer than head and pronotum together in 

 both sexes but especially in the male, and much shorter than the hind 

 femora. Pronotum rather small, the disk markedly clepsydra], the 

 lateral carina; being strongly arcuate and as distinct as the median 

 carina ; prozona and metazona of subequal length, the hind margin 

 rounded obtusangulate ; lateral lobes slightly longer than deep; proster- 

 num not tuberculate. Tegmina extending beyond the abdomen, without 

 intercalary vein, the apical portion of the scapular held expanded in the 

 male. Inner calcaria of hind tibia; subequal. 



Horesidotes cinereus sp. nov. 



Varying greatly from light testaceous with a slight olivaceous tinge 

 and very feeble markings to dark cinereous with heavy markings, which 

 in some females includes a broad median testaceous stripe on head and 

 pronotum, bordered on the latter by a velvety black stripe cut by the 

 lnteous lateral carina? ; but in others these markings are wholly wanting, 

 the disk and tegmina are dark cinereous flecked with griseous, and the 

 lateral lobes are marked with a broad postocular blackish fuscous stripe 

 extending to the eyes and separated sharply and angularly from the clay- 

 yellow of the lower portion of the lobes. Similar differences occur in 

 the males, and there are also some of each sex in which all markings are 

 but faintly indicated. The antenna? are light castaneous, the wings are 

 feebly infumate apically with black veins, and the hind femora are of the 

 color of the upper surface, but where this is light, the upper outer carina 

 is often .marked with black ; hind tibia? glauco-luteous. 

 vol. xxxv. — 4 



