172 NORTH AMERICAN MELANOPLI (ORTHOPTERA) 



I was correct in placing gillettei Scudder as a synonym in 

 1928, but the insect is the typical race of a closely related species 

 and not a race of oregonensis (Thomas) as I then supposed, as 

 is now shown by study of the penis. The individuals which 

 were then considered atypical representatives of " oregonensis 

 marshalli ", from the type of that organ, are seen to be refer- 

 able to oregonensis oregonensis. 



The present race is represented in the author's collection by 

 material from many localities in the Rocky Mountains of Colo- 

 rado, those with altitude given being from 10000 feet or over in 

 the Hudsonian Zone. 4 As already noted here, this race almost 

 certainly occurs also in the mountains of southeastern Wyoming 

 in similar environment. Mount Lincoln is a southern known 

 limit. Extensive collecting in the San Juan Rockies of south- 

 western Colorado indicates that it is not present there, nor has 

 it been found anywhere much west of the continental divide, 

 though it is probably present in the mountains of northwestern 

 Colorado. 



The only material at hand which has not been previously 

 correctly reported is the following. 



Colorado: Trail Ridge Road in Rocky Mountain National Park, 10500 

 feet, VIII, 25, 1933, (G. Alexander), 15,1$. North Park, VIII, 25, 1926, 

 (B. B. Fulton), 2$, 2$. Summit of Gore Mountain near Toponas, VII, 

 10, 1927, (J. C. Bradley), 1$, 1$. 



Melanoplus marshalli ascensor (Scudder) (PI. XII, figs. 4 and 5.) 



1897. Podisma ascensor Scudder, Proc. U.S. Nat. Mus., xx, p. 107, pl. 7, 



fig. 8. [ $ , $ ; American Fork Canyon, [Wasatch Mountains,] Utah.] 



As I have noted in 1928, 5 the type of this insect is an ab- 

 normal specimen in which, though adult, the form of the geni- 

 talia of the instar preceding maturity has persisted. This 

 condition is very rare and is apparently developed only in 

 species which, living in exceptionally rigorous environment, are 

 forced in growth at an unusual rate, during the brief period in 

 which the temperature is sufficiently high for them to move about 

 and feed normally. 



4 See Hebard, Proc. Acad. Nat. Sci. Phila., lxxxi, p. 375 (1929), for five 

 Colorado records. 



5 Proc. Acad. Nat. Sci. Phila., lxxx, p. 269. 



