FAMILY v.— TRYXALIN^E. 113 



B. Spines of the exterior margin of the posterior tibiae 

 15 or more; posterior margin of the disk of the 

 pronotum mostly straight, scarcely angled or 



rounded Pseudopomala. 



BB. Spines of the exterior margin of the posterior tibial 

 less than 15; posterior margin of the disk of the 

 pronotum obtusely angled or rounded. 

 C. Tegmina exceeding the abdomen considerably in 

 both sexes (in some lari^e females but little); 

 lateral carinas of the pronotum quite as dis- 

 tinct as the median; spurs at the apex of the 

 posterior tibiae on the inner side about equal. 



Try X a. lis. 



CC. Tegmina not exceeding the abdomen, even in 



the male Opeia. 



AA. Antennre never triquetrous, sometimes plainly de- 

 pressed basallv or acuminate, most commonly fili- 

 form, rarely clavate; pronotum with the lateral 

 lobes less distinctly vertical, with the lateral carina 

 very rarely quite straight, but gently or strongly 

 sinuate near the middle; median carina of the 

 pronotum generally cut in or not far behind the 

 middle. 

 B. Scutellum of the vertex with a distinct median 

 carina which is usually a coarse raised line 

 stronger anteriorly. 

 C. Spurs on the inner side of the posterior tibiae 

 very unequal, the apical spur being twice as 

 long as the other; antennae very greatly exceed- 

 ing the head and pronotum, somewhat clav- 

 ate Eritettix. 



CC. Spurs on the inner side of the posterior tibiae 

 about equal in length. 

 D. Spines on the exterior margin of the pos- 

 terior tibiae 19-21 Syrbula. 



