585 



k'ctions received I'loiu Liciiteiuiiit (!ar|)('nlcr, UnilctI .Slates Army, iiiid icpurted 

 on by himself and me in llayden's Annual Re[)(jr( for 1S7.''. Tiic results 

 obtained by Lieutenant Carpenter (Miabled me to say "that on I lie peaks almvc 

 a line ot" 12,000 ("eet, the lit una is as truly al|)ine as on the sum mils ol' llie Alps 

 or I he t<)|i of Mount \\'ashinii;ton in New Hampshire. Several species oi!(!ur 

 there which are also found on liie Swiss Alps, as well as Mount Washinirlon, 

 and in Labrador and (ireeidaiid. al the level of the sea." Among the Ijul- 

 terthes, Oenels seiiildea, previously only found on the sumn)it of Mount Wash- 

 ington, N. H., has been found by Litnitenant 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 alpini^ and arctic 

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

 It will be observed that no purely arelie Phahenid moth inhal)its any alpine 

 summit in the United States. 



Oeneis semidca 



Arcti.iqneuselii 



Aiiarta melanopa . . . 

 Agrotis islandica " . . 

 Plusia bochenwarthi 



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

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

 species are closely allied to Anarta melanopa and richardsoni. {A. alg'ida) 

 respectively. Chionohas chryxm has been titund by ,Mr. \\ . 11. I'dwards to 

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

 inhabits Colorado. 



The following table shows the distribution of fourteen species of 

 Phalcenidce, 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 bim under the name of Agrotis auxiliaris. For my reinark.s on i-ilaiidku, see Haydons 

 Aunnal IJeport, 1S73, p. 5.')o. 



74 P H 



