114 FAMILY v.— TRYXALINvE. 



DD. Spines on the exterior margin of the pos- 

 terior tibiae not exceeding 15. Median 

 carina, of pronotuni cut much behind the 

 middle by the principal su\cus.. Chloealtis. 



BB. Scutellum of the vertex with no distinct median 

 carina. 



C. Posterior margin of the metazone angulate. 

 Tegmina usually much shorter than the ab- 

 domen, with the ulnar area not very much 

 wider than the discoidal area. ...Dichromorpha. 



CC. Posterior margin of the metazone rounded or 

 not distinctly angulate. Tegmina not much 

 shorter than the abdomen, with the ulnar 

 area ver\' wide and several times as broad as 

 the discoidal area. 



D. Hind tibia never red Orphula. 



DD. Hind tibiae red. 



E. Median carina of the pronotum high and 

 sharp, cut by the principal sulcus in, or 

 plainly in front of, the middle. Inter- 

 calary vein very strong. Apical spurs 

 on the inner side of the posterior tibia 



unequal Mecostethus. 



EE. Median carina of the pronotum rarely 

 cut plainly in front of the middle, 

 in this case it is not high and sharp, 

 or the intercalary vein is not strong. 



E. Tempora elongate, narrow, from two 

 to four times as long as broad. The 

 apical spur on the inner side of the 

 posterior tibia is much less than 

 twice as long as the one beside it. 



G. Antenna ^Wiorm.... Stenobothrus. 



GG. Antenna c\aY ate.. Gomphocerus. 



