136 BULLETIN UNIVERSITY OF MONTANA. 



On the underside the wings are whitish. There is a row of blacli spots 

 on the fore wings and a oar at the ends of the cell. The hind wing has 

 also a row, but not so large. 



Early Stages — These await description. 



Distribution — The butterfly is found in the region of the Rocky 

 Mountains, from New Mexico to Montana. The University of Montana 

 ■collection has many specimens, collected as follows: at Madison Lakes by 

 Douglas, at New Chicago by Fred D. Smith and Douglas, at Missoula by 

 Elrod, and at Sinyaleamin Lake in the Mission Mountains by Elrod. At 

 Sinyaleamin lake large flocks assembled about camp on the lake bank. 

 Cooley has two from Bozeman, one from 5,800 feet altitude. Coubeaux 

 reports it rather common in the mountains near Big Sandy. 



THE GREENISH BLUE, Cupido saepiolus, Boisduval. Plate XI. 



Butterfly — The male on the upperside has the wings blue, shot in 

 certain lights with brilliant green. xae female on the same side is 

 dusky, with greenish blue scales at the bases of the wings and often with 

 reddish markings on the outer margin of the hinds wings. On the under- 

 side, the wings are gray or pale wood-brown with greenish blue at their 

 base and a profusion of small spots margined with white. Expanse, .95- 

 1.10 in. 



Early Stages — These have not been studied. 



Distribution — The species ranges from British Columbia to Colorado. 



$n western Montana this is a very common species. On the moun- 

 tain slopes by the University it abounds in early spring, collecting in con- 

 siderable numbers by the damp places. Along the roadside in the moun- 

 tain canyons it is a conspicuous figure. It is found throughout the Mis- 

 sion Mountains and around the Biological Station at Flathead lake. 



Genus NOMIADES Hubner. 

 THE SILVERY BLUE, Nominades lygdamas Doubleday. 



Butterfly — Expanse, .85 to 1.10 inches, 21 to 27 mm. Upper side 

 of wings of male pale silvery blue, narrowly edged with black; the wings 

 of the female above darker blue, dusky on the borders, with a dark spot 

 at the end of the cell of the primaries. Under side of wings pale 

 chocolate brown, with a submarignal band of black spots, margined with 

 white, on both wings, as well as a spot at the end of the cells, and one 

 or two on the costa of the secondaries. 



Early Stages — These are unknown. 



Distribution — Found in the South Atlantic states, Colorado, California, 

 New Mexico, and in the Kootenai district of British Columbia. In the 

 state collected by Brandegee at Helena, one male, and by Cooley at 

 Bozeman, two males. 



Genus AGRIADES Hubner. 

 THE RUSTIC BLUE, Agriades rustica, Edwards. Fig. 102B. 



Butterfly — Expanse, .90 to 1.00 inches, 23 to 25 mm. Male bright 

 blue above, female darker. Under side pale-gray on the secondaries, with 

 white spots; primaries with a row of black spots, and a discal black spot 

 bordered with white. 



Early Stages — Unknown. 



