196 PROCEEDINGS OF THE AMERICAN ACADEMY. 



<P. Interspace between mesosternal lobes of male quadrate or 

 subquadrate, or, if feebly transverse (as in Paradichroplus), not 

 so broad as the lobes, and then the pronotum furnished with 

 lateral carin* ; tegraiua ovate or linear. 



e\ Subgenital plate of male pyramidal, pointed, a sliglit tubercle 

 extending beyond its posterior margin, but the margin extend- 

 ing well beyond the apex of the supraanal plate. 



Paradichroplus. 

 e^. Subgenital plate of male more or less conically protuberant 

 apically, but its interior apical margin not surpassing or barely 

 surpassing the apex of the supraanal plate. 



/^ Apical tubercle of subgenital plate small, extending bui 

 a short distance beyond the supraanal plate ; cerci of male 

 abruptly narrowed before the middle by excision of the in- 

 ferior margin, the apical half narrow ; lateral carin^e of 

 pronotum wholly wanting Phcedrotettix. 



f^. Nearly the whole subgenital plate forming a blunt coni- 

 cal tubercle projecting some distance beyond the supraanal 

 plate ; cerci of male forming broad, apically decurved, subfal- 

 cate laminae ; lateral carinse of pronotum more or less dis- 

 tinct Conalccea. 



c^. Interspace between mesosternal lobes of female generally longer 

 than broad, sometimes quadrate, rarely feebly transverse ; * of male 

 never at all transverse (except feebly in Sinaloa and Cephalotettix) ; 

 tegmina variable. 



d}. Tegmina never fully developed, rarely as long as the pro- 

 notum, lateral and ovate or linear, or wholly wanting ; hind 

 margin of pronotum distinctly truncate ; fore and middle femora 

 of male (except in Phaulotettix) distinctly more gibbous than in 

 the female. 



e^ Furcula of male wanting, or forming a pair of brief lobes, 

 at most no longer than broad. 



f^. Last dorsal segment of male furnished mesially with a 

 pair of slightly protuberant rounded lobes; cerci of male 

 compressed laminate, beyond the slightly narrowing basal 

 portion equal or subequal, the tip curved downward or 

 inforiorly angulate at apex. 



* Cephalotettix, in vvliich the female is unknown, is placed in this division. 



