MORGAN HEBARD 171 



6. Male penis with dorso-proximal apices of dorsal lobes produced cephalad 



(PI. XII, fig. 2). Male supra-anal plate shield-shaped to linguliform. 

 (Male furcula variable.) Mountains of Colorado (and probably 

 southeastern Wyoming) at high elevations, (probably in Canadian) 



and in Hudsonian Zone marshalli marshalli (Thomas) 



Male penis with dorsal lobes produced cephalad in dorsal portion but 

 with a delicate integument the cephalic margin of which is vertical 

 which joins this production to the basal portions (PI. XII, fig. 5). 

 Male supra-anal plate narrowly linguliform. (Male furcula long and 

 heavy, less than half as long as supra-anal plate, rarely divergent.) 

 Uinta and Wasatch Mountains of Utah in Canadian and Hudsonian 

 Zones marshalli ascensor (Scudder) 



7. Male penis with dorsal lobes broader and erect, with lateral surfaces 



flattened, dorsal outline rounded angulate in lateral aspect and apices 

 not meeting above the parameres. (PL XIII, fig. 3). Mountains of 

 extreme western Montana (possibly only in southern portion) and 



throughout south-central Idaho indigens indigens Scudder 



Male penis with dorsal lobes narrower, slanting inward, with moderately 

 convex lateral surfaces and apices evenly rounded and meeting above 

 the parameres. Mountains of extreme northwestern Montana (prob- 

 ably north-central Idaho) to northeastern Oregon. 



indigens digitizer new subspecies 



A key to the forms of as difficult a group as the present should 

 be used as an aid, but not as the sole means to distinguish 

 undetermined material. Additional series are badly needed from 

 extreme western Montana, southern Wyoming, northeastern Utah, 

 central and northern Idaho and eastern Washington, and with- 

 out material from these regions the group can not be analyzed 

 with finality. Thus portions of the limits of distribution of 

 several races now remain far from definite, the peculiar condition 

 of indigens occurring in the Payette Lake region of Idaho is 

 assigned to the typical race only tentatively and the condition, 

 known from only a female, which is present in eastern Wash- 

 ington, may well represent a distinctive and undescribed race or 

 species. 



Melanoplus marshalli marshalli (Thomas) (PI. XII, figs. 1 to 3.) 



1875. Pezotettix marshalli Thomas, Rept. Expl. and Surv. West of 100th 



Merid., v, p. 889, pi. 45, fig. 3. [ $ , 9 ; mountains of southern 



Colorado.] 

 1897. Podisma marshalli Scudder, Proc. U.S. Nat. Mus., xx, p. 108, pi. 7, 



fig. 9. [$, 9 ; Mount Lincoln, Colorado, at 11000 to 13000 feet.] 



TRANS. AM. ENT. SOC., LXII. 



