ACRIDIIDAE — OEDirODINAE 37 



inferiorly ; head narrow, its frontal costa mod- 

 erately constricted ; tegmina densely reticulate, 

 fasciate on the costal margin, only the distal 

 third membranaceous. Conozoa Saussure. 



y '. Inferior margin of lateral lobes horizontal, but 

 anteriorly oblique, the jiosterior angle rounded rec- 

 tangulate ; disk of prozona scarcely or not scutel- 

 late posteriorly, the distal third of the tegmina 

 membranaceous. 



h \ Radiate veins of anal field of wings normal. 



Trimerotropis Stal. 

 A-. Radiate veins of anal field of wings dis- 

 tinctly incrassate. . Circotettix Scudder. 

 e ^. Pronotum delicately carinulate ; tegmina densely 

 coriaceo-reticulate, only the distal fourth membrana- 

 ceous. .... Hadrotettix Scudder. 



d^. Pronotal carina obliterated between the sulci. 



e \ Only the proxunal third of tegmina densely reticu- 

 late and coriaceous ; intercalary vein distinctly devel- 

 oped. ..... Anconia Scudder. 



e^. Fully the proximal two-thirds of tegmina densely 

 reticulate and coriaceous ; intercalary vein lacking or 

 indistinct. .... Heliastus Saussure. 



The richest of these genera are Hippiscus with nearly forty 

 species, Arphia and Trimerotropis, each with about twenty, Mes- 

 tobregma (Trachyrachys Scudder) with eight or ten, and Sphara- 

 gemon with nearly as many ; all these genera occur everywhere, 

 excepting Mestobregma, which is found only in the west, where 

 the others are also more numerous in species. Circotettix with 

 about half a dozen species occurs only in the north, but from 

 Atlantic to Pacific. Other genera which range over the whole 

 country or nearly so are Chortophaga and Dissosteira with two 

 or three species each. Chimarocephala, Agymnastus and Lac- 

 tista, each with about two species, are confined to California ; 

 Encoptolophus, Scirtettica and Psinidia, with two or three species 

 each, to the eastern half of the continent ; Cammula Avith a single 



