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



g^. Siibgenital plate of male, as seen from above, 



apically angulate and tuberculate marginatus, 



g"^. Subgenital plate of male, as seen from above, 



apically well rounded and simple paroxyoides. 



d"^. Cerci of male apically bifurcate, or with an inferior 

 submedian process or abrupt angulation, or else expanded 

 so as to be distinctly, generally much, broader apically than 

 at the extreme base ; furcula wanting or minute, rarely {M. 

 arizonce) a fourth as long as the supraanal plate. 



e^. Size smaller or medium ; cerci of male always bifur- 

 cate or with an inferior submedian process or angulation ; 

 supraanal plate pretty regularly triangular with straight or 

 feebly convex lateral margins ; furcula usually distinctly 

 developed, rarely {M. collinus) wanting ; prosternal spine 

 usually short (Collinus series). 

 /\ Lower fork of bifurcation of male cerci much longer 

 than the upper ; apical margin of subgenital plate nar- 

 rowly, abruptly and considerably elevated. 

 g^. Small species; interspace between mesosternal 

 lobes of male more than twice as long as broad ; of 

 female quadrate ; median portion of male cerci cylin- 

 drical, not compressed alpinus. 



g"^. Very small species ; interspace between mesoster- 

 nal lobes of male half as long again as broad ; of 

 female transverse ; median portion of male cerci com- 

 pressed infantilis. 



f^. Upper fork of bifurcation of male cerci longer than 



the lower, which is sometimes merely an inferior median 



or postmedian process ; apical margin of subgenital 



plate elevated, if at all, only broadly, gradually and a 



little. 



^\ Furcula of male distinctly present ; apical margin 



of subgenital plate distinctly elevated more or less 



above the lateral margins. 



h)-. Furcula of male consisting of slender spines, 

 longer than the last dorsal segment ; base of lateral 

 margins of subgenital plate incurved. 



/ \ Furcula of male less than a fourth as long as 

 the supraanal plate ; apical half of cerci bent 

 upward from the basal course. 



