BUTTERFLIES OF MONTANA. 



151 



10. 



Antennae in length twice the width of thorax 

 Antennae short, equal to the width of thorax. 

 Male stigma with modified scales below 

 Male stigma without modified scales below 

 Stigma apparently continuous 

 A small black area below stigma 

 An obscure, weak fulvous area below stigma 

 Mid tibiae with long distinct spines 

 Mid tibiae not, or very feebly spined 

 Male with a stigma 



Genus PAMPHILA. Fabricius. 

 THE ARCTIC SKIPPER, Pamphila palaeman, Pallas. 



7. 



Ochlodes 

 8. 



Thymelicus 

 Erynnis 



10. 

 Limochroes. 



Fig. 111. 



Fig. ill. Pamphila palaemon. 



Butterfly Expanse, 1.10 inches, 27 mm. This butterfly is wholly 

 unlike any other species, and is easily recognized from other skippers of 

 our fauna. The figure shows the markings. The upper side of the 

 wings is dark brown conspicuously marked with yellow spots. The fore 

 wings of the male lack the brand; the spots on the lower side of the hind 

 wings are silvery white. 



Early Stages The caterpillar feeds on grasses. 



Distribution The insect ranges from southern Labrador as far south 

 as the White Mountains and the Adirondacks, thence westward, follow- 

 ing a line north of the Great Lakes to Vancouver's Island and Alaska. 

 It ranges southward along the summits of the mountains as far as South- 

 ern California. Taken in the state by Cooley near Bozeman. One 

 taken at i< lathead lake. 



Genus OARISMA, Scudder. 

 THE POWESHEIK SKIPPER, Oarisma powesheik. 



Fig. 111A. Oarisma powesheik. 



