26 GUIDE TO ORTHOPTERA 



e 2 . Metazona barely longer than prozona, only slightly 

 carinate. .... Acrocara Scudder. 



d 2 . Upper half of head only feebly conical, more or less 

 tumid; face below fronto-vertical process distinctly 

 oblique ; antennae less than half as long as tegmina. 

 e l . Vertex of the head forming an acute angle with 

 the face ; tempora nearly plane triangular spaces. 



Bootettix Bruner. 



e 2 . Vertex of the head forming an obtuse angle with 

 the face ; tempora impressed, trapezoidal. 



Ligurotettix McNeill. 



c 2 . Head as viewed laterally less, though distinctly, ascend- 

 ing. 



d 1 . Antennae much longer than the face ; lower margin 

 of lateral lobes anteriorly excised, broadly exposing the 

 pleura. .... Pedioscirtetes Thomas. 



d 2 . Antennae shorter than the face; lower margin of lat- 

 eral lobes nearly horizontal throughout, scarcely exposing 

 the pleura. .... Ch/mnes Scudder. 



b 2 . Head elevated above the pronotum at most only by the 

 feeble tumescence of the occiput, and not otherwise forming 

 any angle with the pronotum. 



c \ Mesosternal lobes separated by a space almost linear in 



its narrowest part; metasternal lobes approximate in both 



male arid female. .... Mermiria Stal. 



c 2 . Mesosternal lobes separated by a space never much longer 



than broad, generally broader than long ; metasternal lobes 



rarely approximate in the male, very rarely in the female. 



d 1 . Antennae triquetrous, or strongly depressed at the base 



and distinctly acuminate ; pronotum with the lateral lobes 



vertical and straight and the lateral carinae not at all 



sinuate; median carina of the pronotum generally cut 



much behind the middle ; the disk plain and unstriped. 



e l . Tegmina exceeding the abdomen considerably in 



both sexes (in some large females but little); lateral 



carinae of the pronotum quite as distinct as the median ; 



spurs at the apex of the posterior tibiae on the inner 



side about equal. . . . Tryxalis Fabricius. 



