12 University of Michigan 



Michigan to the vicinity of the Straits of Mackinac and from 

 there along the St. Mary's River to Lake Superior and thence 

 to Whitefish Point. A few local lists along the Michigan 

 shores would assist in testing this hypothesis. It is a well 

 known fact that these southern species are found at least 

 along southern parts of both the east and west shores of Lake 

 Michigan. 



Such butterflies as Colias interior, Argynnis atlantis and 

 Grapta gracilis are of distinct northern range and are found 

 also in the White Mountains of New Hampshire, wdiile CJirys- 

 ophanns epixanthe, Limenitis arthemis and Grapta j-albuni 

 are also rather northern in their affinities. These species, 

 with the exception of Grapta gracilis, were the only common 

 butterflies at the Point during the period of investigation. 

 This would seem to indicate that conditions at the Point, 

 though attractive to temperate and even more southern species, 

 are in reality most favorable to the boreal species of the 

 fauna, probably because of the severe winters. 



A western element in the butterfly fauna is represented 

 by Chrysophanns hclloidcs and perhaps Colias curythcme. 

 Regarding the moths of the Point the opinion of specialists in 

 various families is ver}^ interesting. 



Mr. F. H. Wolley Dod writes that the Noctuidce indicate 

 the fauna of Ontario and Quebec generally. Among the rarer 

 species listed are Diphthera fallax, Manicstra rnhefacta and 

 M. ncvadcc, Hadcna indocilis and H. vcrhascoidcs and Hor- 

 misa hivittata. 



Mr. Louis W. Swett says of the Geometridae that outside of 

 a few species it is a typically New England lot, neither south- 

 ern nor northern. Petrophora abrasaria and P. convallaria 

 and Diastictis hicolorata are strictly northern species while 

 Diastictis zvatiaria is rather northern, and all are rare. The 



