^72 MICHIGAN SURVEY, 1908. 



immediate descendants of such migrants. It is well known tliat these 

 butterflies congi-egate in vast flocks in the fall and migrate, some think 

 to the south (like birds), others that they wander about aimlessly until 

 killed by the approaching winter (Tutt, '02, p. 127). This wandering 

 tendency, however, would tend to scatter them as they died off slowly 

 by exhaustion. While it seems incredible to think of a southerly 

 migratory instinct, yet the meteorological conditions developing in the 

 far north might give a southerly direction to the wandering move- 

 ments. 



The occiu'rence of specimens in the shore drift is of interest in 

 connection with the wandering habit of this butterfly. Specimens have 

 been picked up on the beaches of Lake Michigan (Needham, '00, p. 6) ; 

 Lake Erie (Moffat, '01, p. 48) ; and Lake Ontario (Bowles, Can. Ent. 

 Vol. 12, p. 134; and they have been observed flying over Lake Erie. 

 Such facts as above cited suggest that this member of the Isle Royale 

 fauna is restocked each year by migrants, which are probably more 

 likely to come from the southern rather than the northern shore of 

 Lake Superior. If Scudder's opinion is correct, an annual extension 

 of range from the Gulf States to Isle Royale — over 1,200 miles — certain- 

 ly shows remarkable powers of dispersal. 



Geographic Range. — This species has a very extensive range in this 

 hemisphere from northern Patagonia in South America, northwiard 

 through the tropics, West Indies, over most of the United States and 

 southern Canada to British Columbia, Hudson Bay and Lake Athabaska. 

 Through man's influence this species has become almost world-wide in 

 its range. It has been recorded from the south Pacific 500 miles from 

 land (Tutt, '01, p. 40). Originally it was of American origin. 



Lycaenidae. 



Epidemria dorcas Kby. A single specimen of this was taken on August 

 16 in the Cassandra and sedge zone of an open bog (V, 11), (A. 136). 

 Determined by Dr. James Fletcher. 



Geographic Range. — Michigan (Isle Royale) ; Nipigon, Ontario; Mani- 

 toba; Saskatchewan; Athabasca; Alaska, 



Epidemia epixanthe Bd. — Lee. Exipanthe Butterfly. Four specimens 

 were taken on the sedge zone on the north shore of Sumner Lake (III^ 

 5) on July 29. 



This is a swanip species about which Fiske ('01, p. 50) writes: "Tr 

 confines itselif closely in its journeyings to the swamp or bog in whic'li 

 its early stages are passed, and rarely indeed ventures upon higher 

 ground. It loves best of all an open, mossy morass, such as are found 

 scattered" throughout New England, usually surrounding some small 

 pond caught in a hollow between the hills, and formed by the moss and. 

 subaquatic plants which, constantly encroaching upon the water, are 

 bound in time to cover it over." 



Geographic Range. Newfoundland; Quebec; Ontario; Maine; New 

 Hampshire; northern Indiana; Iowa; Kansas and Nebraska. 



Cupido saepiolus Bd. Greenish Blue Butterfly. In all seven speci-' 

 mens of this interesting western species were taken; one about the 

 camp at the Light-house (I, 7) on July 7, (G. 26) ; a second in the 

 clearing on Benson Brook (TI, 1) on July 25 (G. 148) and five speci- 



