Tryon Reakirt on ColoraiUan Butterflies. 131 



all the species, marked with a similar macular row, which it has been 

 my fortune to examine, and very strongly so from Nonu'on, the only 

 species so far as I know, which closely approximates certain forms of 

 the male and/emafe. 



Mr. Ridings captured this fine species in July, solely within the 

 mountain districts; usually when settled upon the flowers of some tree, 

 and always near the edge of a water course. It is abundant, but of 

 difficult capture, not only from the natural obstacles interposed, but 

 also from its very quick and high flight, this commonly ranging from 

 four to eight yards above the head. 



Parnassius Nomion, Fischer. 



Hah. — •■ Rocky Mountains," (Boisduval.) 



Dr. Boisduval states— Ann. Soc. Ent. 2d ser, x. p. 282, that No- 

 mion, in conjunction with Smintheus, is found in the Rocky Moun- 

 tains. I think he must have had in view one of the forms of the pre- 

 ceding species, perhaps var. a — female. 



Pieris Oleracea, Harris, sp. 



Scudder, Proc. Boston Soc. Nat. History, VIII. p. 178. (1861.) 



Hah. — (Western). Empire City, Colorado Territory; Virginia City, 

 Montana Territory. (Coll. Tryon Reakirt.) 



Pike's Peak, Colorado Territory, (Coll. Ent. Soc. Phil.) 



The examples from Empire City ha?e all, with one exception, the 

 apex considerably tipped with black ; the black costal line, and basal 

 atoms are also strongly marked. Three, out of five specimens before 

 me, have on the under side, the costal, sub costal, and median ner- 

 vures of the secondaries, bordered with grayish scales as far as the ex- 

 tremity of the cell only ; in these the under surface of the secon- 

 daries, and the apex of the the primaries are distinctly yellowish 

 trreen. In the other two, the ground color is nearly white, and in 

 these the nervules on the under side of both primaries and secondaries. 

 are heavily bordered with darker scales ; they also present a slender 

 line of grayish scales, crossing the cell longitudinally. 



A single specimen from Montana has the base strongly strewn with 

 black, and a narrow black line at the apex. Underneath, the exterior 

 nervules of the primaries, and nearly all of the secondaries are broadly 

 bordered with dark greenish-gray scales. The exception upon the 

 hind wings is in the lower disco-cellular vein, which is immaculate. 



Mr. Ridings informs me that in Colorado, he captured it only at 

 Empire City, nor did he see it anywhere else on his route. I had it 



