232 ARGYROPHORUS. By G. Weymer. 



Forevv'iiig witliunt oyc-s])ots or with 1 or 2 black ones, sometimes white-pupilled, hiiulwing without ocelh. 

 Hindwiiig beneath ochre-yellow, marbled with grey and black-brown. Median band darker, bordered at each 

 side by a light grey, sometimes darker band. Veins not dusted with white. Sometimes, however, the marbling 

 assiiiiilis. of the hindwing is so nrach darkened as to obliterate the median band (assiniilis Btlr.). — The egg is similar 

 to that of jnfia. but the ribs on the surface are finer. The larva is ochre(nis grey, with darker and lighter longi- 

 tudinal stripes and rows of black spots. Localities: Newfoundland, l^abrador, Alaska. Occurs also in North 

 Asia (cf. vol. I, p. 120, pi. 40 f, under "cramAis"). 



semicka. 0. seiTlidea Say. (50 g). The fj is ruiicolorous grey-brown above, the $ dark brown with darker mar- 



ginal line, chequered fringes and small dark brown spots at the margin of the hindwing. The body is black- 

 brown, the club of the antenna red-brown. The forewing beneath is brownish grey, towards the apex marbled 

 with dark brown and whitish grey. The hindwing beneath is brown, marbled with dark brown in the basal 

 and median areas, only the marginal area is marbled with whitish grey and brown, at the distal margin darker- 

 spotted. — The egg is rather irregularly ribbed, grey-Avhite, with silky gloss. The larva light green or yellow- 

 brown with dark transverse shades on each segment and rows of blackish dots at the sides and on the back. 

 Pupa black-brown with yellow-brown abdomen. The butterfly flies on rocky mountains, locally in large numbers, 

 as on the peak of Mt. Washington in New Hampshire, also in Colorado and Labrador. 



bniccl. 0. brucei Edw. (50 g) approaches semidea. It is, however, much more thinly scaled and hence semitrans- 



parent. Above like semidea, the under surface of the forewing also as in this. But the under surface of the 

 hindwing is much lighter, the basal area has a whitish grey ground-coloiu', the median band stands out distinctly 

 and the brown lines bordering it are outcurved at the costal margin (which is not the case in semidea). — The 

 larva is ochre-yellow, shaded with brownish, with rows of darker dots. Pupa obtuse with the head truncate 

 (nmch as in semidea and uhleri, but less than in jutta). The butterfly flies on grassy mountain slopes from 

 the end of June to August, local. (Not on rocky peaks like sertiidea.) It is found in Colorado at elevations of 

 12 to 14(i()(» ft., in the Canadian province of Alberta at 8 to 9()(l() ft. 



hriDii. 0. bean! Elw. Likewise similar to .semidea and thinly scaled. Above unicolorous light smoke-brown, 



the costal margin very narrowly light grey, dusted with black. The scent-scale stripe of the ^(^ indistinct. 

 Beneath the forewing is as above, but the costal margin narrowly and the apex broadly light grey, dusted 

 with dark brown. The hindwing is light grey, densely dusted with black-brown without any trace of a band. 

 Fringes chequered. Palpus entirely black. In the $ the hindtibia is thickened and at its extremity curved in- 

 wards. Found on rocky peaks near Laggan in Alberta at 8000 — 9000 ft. 



kalaliiiiii. 0. katahdin Newcomh (50 g). Above dark-brown, the distal third of the wings yellowish brown with 



blackish marginal line, fringes chequered with light and dark brown. A small black, white-pupilled spot before 

 the apex of the forewing. Sometimes 3 or 4 such spots are present on the forewing, sometimes again all are 

 absent. The scent-scale spot is faintly visible. Beneath the forewing is as above, but paler, costa and apex dotted 

 with brown. The hindwing Iseneath has an irregular brown band through the middle, which is at first bordered 

 with black, then with grey. The V has the light brown colouring of the distal margin on the upperside more 

 definite and usually 2 or 3 eye-spots. There is also a row of 5 whitish spots before the distal margin on the 

 underside of the hindwing. The butterfly flies on Mt. Katahdin in Maine at altitudes of 4250 — 5000 ft., at 

 the end of June. 



daaru. 0. daura Sfreck. has been described from a single example, which was taken by Morrison on Mt. 



Graham in Arizona. It is similar to the Siberian fidla Eversm. (cf. vol. I, p. 119, \)\. 40 d), of a whitish ochre- 

 yellow ground-colour (like ivalida [50 f]) with an angled brown median line and 3 small black spots, the first 

 pupilled on the forewing. Hindwing at the margin broadly lighter and with a black dot in cellule 2. Fringes 

 chequered. Beneath the hindwing is almost white, very finely and weakly marbled, with a somewhat darker, 

 sharply defined median band. From Arizona. 



21. Genus: Ai'^",vi'<»|»Imumis Blanch. 



This genus is easily recognized by the dense silver gloss Avhich almost entirely covers the wings above 

 and beneath, or at least the upperside of the forewing. The costal and median are strongly inflated at the base. 

 The upper discocellular of the hindwing is rather short. The wings are broader and less elongated than in Oeneis, 

 the distal margin more rounded, the palpus less hairy. The antenna has the club comparatively short and thick. 

 Although the butterflies do not even reach medium size, the first species is one of the most striking insects in 

 the American fauna. 



arycutcui: A. argeilteus Blanch. (51a). Above entirely glossy silver-white without markings, fringes brown, body 



brown with white hairs. Forewing beneath likewise silvery white, the cell dusted wilh reddish yellow, with a 

 snuill, round black .spot before the apex, which in the $ contains a white ceirtral dot. inner margin grey, fringes 

 brown. Hindwing silver-white, basal half dusted with brownish white, with brown spots between, but with all 



