BUTTERFLIES OF MONTANA. 



23 



THE EURYMEDON BUTTERFLY. 



Papilio eurymedon, Boisduval, Fig. 19. 



Fig 19, Papilio eurymedon. 



Butterfly — In the style of its marking it resembles P. daunus, but 

 the ground color is always pale whitish yellow or white, and the white 

 marginal spots on the under side of the fore wings continuous as in 

 P. rutulus. Expanse 3.50—4.00, 87—100 mm. 



In the western part of the state it is the most abundant species, 

 flying as early as April 30, and taken through May, June and July. 



Food — The caterpillar resembles P .turnus, but may be distinguished 

 by its paler color and the much smaller spots composing the longitudinal 

 series on the back and sides, and by the different color of the head. It 

 feeds upon a variety of plants, and is especially partial to Rhamnus 

 californicus. 



Distribution — The species ranges from Mexico to Alaska, eastward to 

 Colorado. It is abundant in the valleys of the Coast ranges, and is very 

 common in the canyon of the Frazer river, British Columbia, in June. 

 Common, though not abundant, around Missoula, and taken in the Mis- 

 sion mountains and at Swan lake. It has been taken at 6,000 feet at 

 Helena by Brandegee. At Bozeman it is not very abundant (Cooley). 

 Wiley has one specimen from Miles City. 



