LOCUSTIDAE DECTICINAE 55 



Genera of XipUidiini. 



a *. Larger and stouter species. Ovipositor short, falcate. 



Orchelimum Serville. 



a 2 . Smaller and slenderer species. Ovipositor straight or 

 scarcely curved. .... Xiphidium Serville. 



These two genera are united by Redtenbacher, the latest 

 monographer of the group. Both, but especially the latter, are 

 represented by a considerable number of species from all parts of 

 the country. 



DECTICINAE. 



This subfamily is fairly well represented in North America, all 

 the groups into which it is divided by Brunner, with but one 

 exception, being represented, and nearly as many genera being 

 found here as in all other countries taken together. The species 

 of the" genera are, however, in no case numerous. 



Genera of Decticinae. 

 A l . Prosternum armed with two erect spines. 



b l . Four terminal spines on the lower side of the hind femora, 

 two smaller ones between a larger pair. 

 c 1 . Ovipositor straight. 



d l . Prosternal spines short, obtuse. Engoniaspis Brunner. 

 c/ 2 . Prosternal spines long and slender, subacute. 



Atlanticus Scudder. 

 c 2 . Ovipositor arcuate. 



(7 1 . Ovipositor curved downward. 



e l . Tegmina longer than the body ; posterior process 



of pronotum brief ; humeral sinus in posterior margin of 



lateral lobes distinct. . . Capnobotes Scudder. 



e 2 . Tegmina shorter than pronotum ; posterior process 



of pronotum long ; no humeral sinus in posterior margin 



of lateral lobes. .... Apote Scudder. 



c? 2 . Ovipositor curved upward. Orchesticus Saussure. 



# 2 . Two terminal spines only (the outer) on the lower side of 



the hind femora. .... Tropizaspis Brunner. 



