180 FAMILY v.— ACKIDIIN^. 



cc. Sub-genital plate of male distinctly narrower 

 than long, often narrowing apicaWy... gracilis. 

 AA. Tegmina nearly or quite as long as or longer than the 

 abdomen; furcula usually well developed, generally 

 at least a quarter as long as the supra-anal plate, 

 but sometimes obsolete, 

 b. Cerci of male rapidly expanding from the base to- 

 wards the middle, as a whole broad and short, 

 flabellate, rarel\' twice as long as broad, not ex- 

 panded apically occidentalis. 



bb. Cerci-of male tapering from the very base towards 

 the middle, rarely equal in basal portion, gen- 

 erally long and slender, and rarely as little as 

 twice as long as broad. 

 c. Cerci of male beyond the middle either equal or 

 tapering, the tip usually slender or acuminate, 

 never bifurcate. Apical margin of sub-genital 

 plate of male notched, 

 d. Tegmina extending bej^ond hind femora, if at 

 all, by not more than the length of the pro- 

 notum, generally by much less than that ; 

 prozona of male quadrate or very feebly 

 * transverse; cerci of male generally almost 



or quite twice as long as broad atlani$. 



dd. Tegmina extending beyond hind femora by 

 the length of the pronotum or nearly as 

 much, often by the length of head and 

 pronotum combined ; prozona of male 

 generally strongly transverse; cerci of 

 male not more than half as long again as 



broad spretus. 



e. Sub-genital plate of male as broad or 

 nearly as broad at apex as at base, 

 generally elevated apically and often 

 notched (generally narrowly) ; cerci 

 usually narrowing but little on basal 



