BUTTERFLIES OF MONTANA. 



37 



GENUS EURYMUS, Swainson. 



(The Sulphurs.) 



Fig. 33. 



Butterfly — Medium sized, yellow or orange 



in color, with black borders upon the wings. 



In many species this border is heavier in the 



female than in the male. 



Egg — The egg is spindle shaped, thickest at 

 the middle, tapering at the apex and at the 

 base, generally attached by an enlarged disk- 

 like expansion, to the point on which it is 

 laid. The caterpillar feeds upon Leguminosae 

 and especially upon the clover. 



Distribution — This genus is represented 

 throughout the temperate regions of both 

 hemispheres. It also occurs in the cooler por- 

 tions of South America and along the ranges 

 of the Andes. 



Key to Species. 

 1. Ground color of wings yellow, no black at 

 base; underside with a sub-marginal 

 row of dark points, philodice. 



Ground color of wings orange, or at least an orange patch in the 

 middle of fore wings. 



Wings orange above and below, eurytheme. 



Wings deep orange above, green below meadii. 



Under side without sub-marginal row of black spots. Apex of fore 

 wings and the entire surface of hind wings greenish gray, color 

 generally white, scudderi. 



Canary yellow, larger than preceding; ocellus on under side, hin 1 

 wings white, alexandra. 



Venation •f Eurymns. 



THE COiVIMON SULPHUR. 

 Eurymus philodice Godart. Fig. 34. 



Fig. 34. Eurymus philodice, left figure, male; right female. 



