88 BULLETIN UNIVERSITY OF MONTANA. 



at Bozeman, by Wiley at Miles City, Brandegee at Helena, and by Elrod 

 at Missoula. One worn specimen from Bear Paw Mountains belongs to 

 this species. 



THE GRACEFUL ANGLE-WING. 

 Polygonia gracilis, Grote and Robinson. 



Butterfly A small species, rather heavily marked with dark or 

 blackish on the upper side. The wings on the under side are very dark, 

 crossed about the middle by a pale gray or white band, shading off to- 

 ward the outer margins. This light band serves as a means of easily 

 identifying the species. Expanse, 1.75 inches, 45 mm. 



Early Stages Unknown. 



Distribution The species has been found on White Mountains in 

 New Hampshire, in Maine, Canada and British America, as far west as 

 Alaska. 



While the species is recorded as having a western distribution it 

 has not been taken by the writers in the state, nor is it reported in the 

 other collections. 



THE SILENUS ANGLE-WING. 

 Polygonia oreas. var. silenus, Edwards. 



Butterfly Expanse, 2.2 inches, 56 mm. Primaries moderately in- 

 cised; slightly dentated; tail long, broad and straight; a prominent 

 dentation between tail and inner angle, which last is much pronounced. 

 Upper side deep red-fulvous, clouded with brown-ferruginous next base 

 of each wing and on disks, and spotted with black, hind margins have 

 a broad cinnamon border of nearly uniform width, black with a ferrugin- 

 ous tint; on the inner side a series of separate, pale fulvous spots, yel- 

 lowish next apex of primaries, irregular in size, lanseolete; primaries 

 have a large sub-apical ferruginous patch on costal margin, another near 

 inner angle, a broad black spot from costa covering the arc, two oval 

 spot in cell placed transversely and sometimes confluent, two others in 

 first and second median spaces, and a large sub-ovate spot on sub- 

 median interspace extending partly over the one next above. Secondaries 

 have the entire costal margin brownish-black, a large irregular black patch 

 on disk between upper branch of the sub-costal and the median nervure; 

 a brownish-ferruginous patch at base of the upper median nervules; the 

 whole extra-discal area suffused with ferruginous, passing imperceptibly 

 into the marginal border; fringes fuscous, with a very little white in the 

 emarginations. 



Under side mostly in shades of black or black-brown, the entire sur- 

 face, except where deep black prevails, covered with fine abbreviated 

 streaks darker than the ground; apex of the primaries faintly tinted with 

 olivaceous; costal mragin brown, with a few gray scales near apex, a 

 whitish patch beyond extremity of cell and a smaller one nearer base; 

 base of primaries brown, of secondaries brown next costa, black towards 

 abdominal margin; the disks crossed by a common, broad, black band, 

 very irregular in its exterior outline, on lower part of secondaries merg- 

 ing into the black basal area, outside the band, on primaries and upper 

 part of secondaries, grayish-white for a little space, densely streaked, 



