i;?8 BULLETIN UNIVERSITY OF MONTANA. 



On the underside the wings are stone-gray, with the usual sijots, and on 

 the secondaries the orange colored marginal spots are oblong, tipped in- 

 wardly with black and outwardly by a series of metallic green macula- 

 tions. Expanse, .90-1.15 in. 



Early Stages — Very little known. 



Distribution — It is found from Kansas to Arizona, and northward to 

 Montana. The University of Montana collection contains specimens from 

 the Mission Mountains, Flathead Indian Reservation, Missoula, New Chi- 

 cago (Smith). It is rei)orted as common at Miles City (Wiley). It is 

 abundant around the University of Montana Biological Station at Flat- 

 head Lake. Taken by Couzeaux in the Bear Pow Mountains. Allen has 

 it from Dillon. Coues collected a number of specimens from a number 

 of localities along our northern border in 1874. 



THE SHASTA BLUE, Rusticus shasta, Edwards. 



Butterfly — The male is blue; the female brown. On the underside 

 the wings are a dirty gray, with black spots, and in addition, on the 

 hind wings, there are a number of small marginal spots, surmounted by 

 metllic colored bluish green scales. Expanse, 1.00 inch. 



Early Stages — These have not been described. 



Distribution — It is found in Montana and Nevada. It is also reported 

 from northern California and Oregon. 



There are two specimens from Martinsdale in the University of 

 Montana collection. 



Genus CYANIRIS Dahlman. 

 THE COMMON BLUE or SPRING AZURE, Cyaniris ladon, Cramer. 



Fig. 102A. Cyaniris ladon, slightly reduced. 



Butterfly — Expanse of wings, 9 inch to 1.4 inches, 23-25 mm. The 

 species is subject to great variation. In general terms, the upper side 

 of the wings of the male is a deep azure-blue with a delicate terminal 

 black line. Fringes black on the apical part of the wings, but white 

 barred with black on the rest of the fore wings and on the hind wings. 



The fore wings of the female have a broad blackish outer border, 

 in some examples extending along the costa. The hind wings have a 

 blackish costa, and a row of dark spots along the outer margin. The 

 ground color is usually a lighter blue on the females than on the males. 



The under side is a very pale silvery gray, with a silky lustre, and 

 there are the following pale brown markings: a row of spots along the 

 outer margin, each preceded by a crescent ; a curved row of alongate spots 

 across the disk of the fore wings; and several small spots on the basal 

 part of the hind wings. 



