170 NORTH AMERICAN MELANOPLI (ORTHOPTERA) 



1. Male subgenital plate with apex produced, coarsely transversely nodose 



or weakly binodose. Penis with very different development of dorsal 

 lobes. Tegmina averaging narrower and so often more separated in 



both sexes 2 



Male subgenital plate with apex scarcely produced, feebly binodose. 

 Penis with dorsal lobes very greatly produced as very large, horizon- 

 tally spread, erect processes which in caudal aspect show an exception- 

 ally great expanse (PI. XII, fig. 10). Male cerci proportionately 

 smaller, (not spatulate distad. Male furcula small and very strongly 

 divergent. Tegmina averaging broader and so less separated in both 

 sexes than is usual in the related species. Ventral surfaces of caudal 

 femora dull yellowish buff.) Mountains of central western Idaho and 

 adjacent Washington, in Canadian Zone payettei new species 



2. Male cerci not widened distad and there narrowing to the broad rounded 



apex; distal spatulation consequently not indicated 3 



Male cerci widened distad, the distal portion definitely (though rarely 

 strongly) elongate spatulate. (Ventral surface of caudal femora, at 

 least in external portion, richly colored (rich orange to deep red) 

 except in recessive specimens.) 7 



3. Ventral surface of caudal femora dull yellowish buff, tinged with orange 



in most intensive series 4 



Ventral surface of caudal femora, at least in external portion, richly 

 colored (rich orange to deep red), except in recessive specimens. Male 

 furcula not heavy, less than one-third as long as the shield-shaped 

 supra-anal plate. Penis with projecting portions of dorsal lobes very 

 small and short, rounded (PI. XIII, figs. 1 and 2). Missoula, (in 

 western), Montana indigens missoulae new subspecies 



4. Male supra-anal plate much longer than broad 5 



Male supra-anal plate only slightly longer than broad, triangularly 

 shield-shaped. Furcula and penis as in oregonensis oregonensis. 

 Rocky Mountains in southern Alberta and northern Montana. 



oregonensis triangularis Hebard 



5. Male penis with dorsal lobes vertical, their apices not produced 



cephalad. 3 (Male supra-anal plate shield-shaped to linguliform. Male 

 furcula long and heavy, less than half as long as supra-anal plate, 

 rarely divergent.) Rocky Mountains from northern Montana to 

 (probably central eastern and) southwestern Wyoming and extreme 

 southeastern Idaho, in Canadian Zone. 



oregonensis oregonensis (Thomas) 

 Male penis with dorsal lobes projecting cephalad 6 



3 Showing nearest approach to the type developed in indigens missoulae, 

 see plate XIII, figs. 1 and 2. 



