THE MOUNT DESERT REGION 85 



on most of the Crncif erae, including turnip, mustard, horse- 

 radish, water-cress, etc. It is usually kept in check by 

 parasites.^ 

 P. NAPi var. OLERACEA Harr. White mustard butterfly. Rare. 

 Near Newport Mt. (Reich and Burton). Formerly com- 

 mon throughout northern New England, but since the intro- 

 duction of Pieris rapae, it has become comparatively 

 scarce, probably owing to parasites. The larva feeds on 

 mustard, cabbage, turnip, and other Cruciferae. 



EuRYMUS Swainson (Colias auct.) 



E. PHOLADiCE Godart. Common sulphur-butterfly. Common, 

 July-Sept. The larva feeds on a number of the Legumino- 

 sae, but prefers the clovers. 



E. INTERIOR Scud. Pink-edged sulphur-butterfly. Sometimes 

 quite common throughout the island in July. 



E. EURYTHEME Bdv. Oraugc sulphur-butterfly. A western 

 species that is occasionally found in New England. Mr. 

 Scudder, on the distribution of this species in his "Butter- 

 flies of New England," says: "Mt. Desert, Me., a single 

 specimen seen (Thaxter)." Again, on page 1132, he says: 

 "Mr. Thaxter was attracted to the specimen which he took 

 at Mr. Desert by the orange color of the wings, and says the 

 .butterfly was apparently dancing in nuptial pas de deux 

 with a companion; they twirled high into the air beyond 

 reach but soon separated and came to earth again w^hen one 

 was captured." 



EuREME Swainson {Terms auct.) 



E. EUTERPE Menet. (T. lisa Bdv.). Little sulphur-butterfly. 

 "One in excellent condition was taken on Mt, Desert, Me., 

 by Mr. Roland Thaxter in August, 1880" (Scudder). 



Nymphalidae 

 Argynnis Fabricius 



A. CYBELE Fab. Great spangled fritillary. Common during 

 July and August. The larva passes the winter in a partly 



' For a list of the parasites of butterflies, moths, and other insects, consult the 

 lists of parasitic wasps, Braconidae and Ichneumonidae, and the parasitic flies, 

 Tachinidae. 



