Occasional Papers of the Museum of Zoology ii 



quette in 191 6) and in the Lower Peninsula (near Benton 

 Harbor in 19 17, in connection with the biological survey of 

 the state j reports of which will be published at a later date, 

 and has also seen collections made by Dr. W. W. Newcomb 

 at Eckerman, Chippewa County, in 19 15 and in Dickinson 

 County in 1909. 



In looking over the list of \Miitefish Point butterflies the 

 most striking features seem to be the presence of several 

 rather southern species which one would hardly expect to 

 find so far north, the small numbers of true boreal species, the 

 dominance as regards species of the usual forms found in 

 the northeastern temperate region of the United States, that 

 is the New England states, New York, Ohio and Lower 

 Peninsula of Michigan, and the presence of a few western 

 forms. 



The occurrence of such butterflies as Junonia ca^nia, 

 Euptolcta claudia, Tcrias lisa and Catopsilia cuhulc and the 

 hawk moth Acllopos tantalus, although the latter is not com- 

 mon, certainly makes one believe that the Whitefish Point 

 coimtry is at least somewhat attractive to those southern but- 

 terflies which have any inclination at all to migrate, and it is 

 very possible that some of the species listed bred at the Point. 

 On the dry sandy ridges it is very warm as a rule, and un- 

 doubtedly the vegetation in some places corresponds well to 

 certain sand dune regions along the Lake Michigan shore. 

 At Whitefish Point and along the coast, killing frosts do not 

 occur as a rule until October, while back from the coast a 

 short distance and in the interior such frosts occur a month 

 or two earlier. 



From the collections and lists it appears that the most prob- 

 able route of migration for these southern forms is along the 

 lake shores, that is along both east and west shores of Lake 



