585 



lections received from Lieutenant Carpenter, United States Army, and reported 

 on by himself and mc in Hayden's Annual Report for 1873. The results 

 obtained by Lieutenant Carpenter enabled me to say "that on the peaks above 

 a line of 12,000 feet, the fauna is as truly alpine as on the summits of the Alps 

 or the top of Mount Washington in New Hampshire. Several species occur 

 there which are also "found on the Swiss Alps, as well as Mount Washington, 

 and in Labrador and Greenland, at the level of the sea." Among the but- 

 terflies, Oeneis semidm, previously only found on the summit of Mount Wash- 

 ington, N. H., has been found by Lieutenant Carpenter at 12,000 feet eleva- 

 tion, and 1 found it at about the same elevation on Pike's Peak in the summer 

 of 1875. This establishes the complete identity of the faunae of the alpine 

 summits of the United States at or above the snow-line. 



The following table shows the distribution of the alpine and arctic 

 Lepidoptera up to this lime known to inhabit the alpine summits of Colorado. 

 It will be observed that no purely arctic Phalsenid moth inhabits any alpine 

 summit in the United States. 



Besides Anarta melanopa, two other species (A. quadrilunata and A. 

 subfuscula Grote) are recorded from Colorado by Mr. Grote. These two 

 species are closely allied to Anarta melanopa and- richardsoni {A. algidd) 

 respectively. Chionobas chryxus has been found by Mr. W. H. Edwards to 

 occur both in Colorado and Hudson's Bay, while another species (C. uhleri) 

 inhabits Colorado. 



The following table shows the distribution of fourteen species of 

 Phalcen'idcc, most of which are found in Colorado, between an elevation of 



* The Colorado and Pacific coast form of this species is regarded by Mr. Grote as a distinct species, 

 and described by him under the name of Agrolis auxiliaris. For my remarks on islandica, see Hayden s 

 Annual Report, 1873, p. 555. 

 74 P n 



