16 THE SPECIES OF THE GENUS MELANOPLUS. [Jan. 15, 



/\ Hind margin of pronotum distinctly though ob- 

 tusely angulate ; interspace between mesosternal lobes 

 of female at least half as long again as broad ; apical 

 portion of anal cerci of male distinctly and sharply sul- 



cate exteriorly plebejiis. 



/'-. Hind margin of pronotum rarely angulate, some- 

 times emarginate ; interspace between mesosternal lobes 

 of female (where known) subquadrate ; apical portion 

 of anal cerci of male exteriorly tumid or plane. 

 g^. Posterior margin of pronotum distinctly emar- 

 ginate in the middle ; tegmina widely separated ; 

 cerci of male elongate, surpassing supraanal plate; 

 subgenital plate broader at base than apically, its 

 apical margin regularly rounded and even . . .gi-acilis. 

 g\ Posterior margin of pronotum obtusely angulate 

 or rounded truncate, with at most but feeblest sign of 

 any emargination ; tegmina attingent or overlapping; 

 cerci of male relatively brief, not surpassing the 

 supraanal plate ; subgenital plate not broader at base 

 than apically, its apical margin angulate or tubercu- 

 late. 



h^. Tegmina shorter than pronotum ; posterior 

 margin of pronotum rounded truncate, with feeblest 

 signs of mesial emargination; cerci of male curved 

 slightly upward ; subgenital plate ending in a blunt 



rather coarse tubercle inops. 



/^^ Tegmina longer than pronotum ; posterior mar- 

 gin of pronotum distinctly though very obtusely 

 angulate ; cerci of male curved feebly downward ; 

 subgenital plate ending in a delicate pointed 



tubercle marginatus. 



A'\ 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 supraanal plate, but sometimes obsolete. 



^\ Cerci of male rapidly expanding from the base towards the 

 middle, as a whole broad and short, flabellate, rarely twice as 

 long as broad, not expanded apically (Flabellifer series). 



<:\ Cerci of male twice as broad in broadest as in narrowest 

 portion. 



