BUTTERFLIES OF MONTANA. 91 



patch; a black spot in the cell with three black spots below the cell, the 

 one nearest the base of the wing quite large. 



The hind wings have a black and brown border a little within the 

 margin, the yellow outside sprinkled with brown atoms; a large black 

 space below the costa, beyond which is a whitish patch. 



Under side grayish brown, the usual darker band across the middle 

 which on the hind wings is but little darker than the base; beyond this 

 greenish white the whole surface finely reticulated with brown lines. 

 There are the usual three elongate patches edged with dark brown in the 

 cell of the fore wings. The submarginal row of ashy-blue lunules be- 

 tween these and the median band. The lunules do not reach the apex 

 of the fore wings. 



Early Stages The mature larva is two inches, 50 mm. long, head with 

 black markings on the sides, thickly set with little points and with 

 short spines; somewhat cordate, the vertices surmounted by two shining 

 black, thick spines, verticeliated near the tip. The dorsal and subdorsal 

 rows of spines shining black except at the base, which is reddish, with 

 long branches, those of the anterior joints more thickly branched than 

 the others. The super- and sub-stigmatted row reddish tipped with 

 black. 



The chrysallis is one inch long, of a beautiful color, delicately re- 

 ticulated, with six golden spots on the bac't. 



The food-plant is not known, but Prof. Fernald's surmise is that 

 it may be willow. The butterfly hibernates, the new brood appearing 

 about the middle of August. 



Distribution It is a northern form, being found in Pennsylvania upon 

 the summits of the Alleghanies, and thence northward to Labrador on 

 the east and Alaska on the west. It is always a rather scarce insect, 

 says Holland. See note accompanying"' the genus. It is occasionally 

 found at Missoula. Around the biological laboratory at Flathead lake 

 it is often captured. At Schultz's cabin, which is along Aeneas trail 

 over the Swan range, it is quite common, but Bond's cabin at Swan lake 

 is the greatest collecting field in the state, perhaps in the country, for 

 this species. Hundreds were taken here in two or three days in August. 

 1903. Wiley has one specimen from Miles City, July 15, 1892. 



