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VOL. XXVI. 



LONDON, MAY, 1894. 



No. 5. 



BUTTERFLIES COMMON TO NORWAY AND ARCTIC 



NORTH AMERICA* 



BY F. M. WEBSTER, WOOSTER, OHIO. 



In his " Fortegnelse over Norges Lepidoptera" (Christiania Viden- 

 skabsSelskabs Forhandlinger for 1893, No. 13), Dr. W, H. Schoyen, 

 State Entomologist of Norway, has given us a list of 1267 species of 

 Lepidoptera that inhabit his country, tabulated to show the Provinces in 

 which they occur, and the exact latitude over which each species is known 

 to be distributed. The interest which this list posesses for the American 

 entomologist is in the number of species it contains that are common to 

 both countries. As studies of this nature are of much interest to the 

 student of geographical distribution, but unfortunately out of the reach 

 of many, I here give a list of such species as occur with us, their distri- 

 bution being given both in America, as far as I am able to do so, and in 

 Norway according to the information contained in Dr. Schoyen's list. 



It will aid us considerably in understanding the subject, to keep in 

 mind an idea of the topography of Norway, stretching as it does from 

 lat. 58° to 71°, and throughout this distance consisting of a narrow stretch 

 of country lying between a mountain range and the Arctic Ocean. 

 Northward from about 62° 30' the provinces extend from the sea inland 

 to the mountains, but south of this a range of mountains extends through 

 near the centre with provinces lying both to the east and to the west. 



Papilio inachcion, Linn. This is the only species of the genus in- 

 cluded in the list, and occurs in all but six of the eighteen provinces of 

 Norway, ranging from the extreme south at lat. ^2>'^ to 70^ rS', the un- 

 occupied area, however, being the central and the very extreme northern 

 parts of the country. In North America, var. Alaska, Scudder, is quite 

 common in Alaska, from whence it extends eastward to Hudson Bay at 

 about 51° 30', though I find no proof of its holding this latitude to the 



*Read before the Ohio Academy of Science, Dec. 28, 1893. 



