ACRIDIIDAE TRYXALINAE 2 7 



e 2 . Tegmina not exceeding the abdomen even in the 

 male. 



y 1 . Lateral foveolae of the vertex linear and distinct ; 

 tegmina quite unspotted ; inner spurs of posterior 

 tibiae equal. . . . Napaia McNeill. 



/" 2 . Lateral foveolae less distinct and subtriangular or 

 obsolete ; tegmina more or less distinctly spotted as 

 well as the face and pronotum ; inner tibial spurs 

 very unequal, the longer but little shorter than the 

 first tarsal joint. . . . Opeia McNeill. 

 c? 2 . Antennae never triquetrous, sometimes plainly de- 

 pressed basally and acuminate, most commonly filiform, 

 rarely clavate ; pronotum with the lateral lobes less dis- 

 tinctly vertical, with the lateral carinae 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. 



e l . Tempora either foveolate or plane, not visible from 

 above. 



f l . Scutellum of the vertex with a distinct median 

 carina, which is usually a coarse raised line stronger 

 anteriorly. 



g l . Spurs on the inner side of posterior tibiae very 

 unequal, the apical spur being twice as long as the 

 other. 



h l . Antennae depressed basally and distinctly 

 acuminate ; no supplementary carinae present 

 either upon the head or disk of the pronotum. 



Pedeticum McNeill. 



A 2 . Antennae depressed apically and somewhat 



clavate ; supplementary carinae accompanying 



the median carina upon either the head or the 



disk of the pronotum. . Eritettix Bruner. 



g 2 . Spurs of the inner side of the posterior tibiae 



about equal in length. 



h l . Spines on the exterior margin of the pos- 

 terior tibiae 19-21. . . Syrbida Stal. 



