334 



The head and body are whitish above. On the primaries all pale areas are 

 heavily clothed with whitish scales and all dark spots but the large triangle 

 more or less irrorate with white. Expanse about 21 mm. 



Distribution : The types were taken on the Rouge River, S. Ore., 

 and in Lake County, Cal., in May and June respectively. We have 

 four specimens from Monache Meadows, Tulare Co., Cal., taken at an 

 altitude of 8000 ft. in July. 



There are two paratypes in the Fernald collection. (3ne lacks the 

 wings on one side, and agrees with our specimens as described above. 

 The other is in good condition and is less contrasty. 



From some two hundred specimens of this group in the Barnes 

 collection, including a good series from the locality mentioned above, 

 we have picked only the four specimens which seem to us typical of 

 this form. Others from the same locality appear to be nearer fragilis 

 and shastae. 



17. Platyptilia shastae Walsingham. PI. XLIII, fig. 7. 

 Platyptilus shastae Walsingham, Pter. Cal. Ore. 14, pi. I, f. 11, 1880. 



Dimmock, Psyche III, 403, 1882. 

 Platyptilia shastae Fernald, Smith's List Lep. N. A. 87, 1891. 



Id., Pter, N. A. 28, 1898. 



Id., Bull. 52 U. S. N, M. 443, 1902 



B. C. Ent. Soc. Check List 42, 1906. 



Meyrick, Gen. Ins. C, 11, 1910. 



Id., Wagner's Lep. Cat. pars 17, 15, 1913. 



Barnes & McDunnough, Check List ISO, 1917. 

 Shastae is in general of cold shades, but much darker than albida. The 

 legs, as noted in the key, tend more to a variably complete suffusion of gray 

 and the head and body are usually noticeably gray above. The spots near the 

 inner margin of the primaries are completely lacking in the typical form, and 

 that in the cell is fused with the dark costal area. All other marks are as in 

 albida and the other forms, but the wings have a vaguely marked, dull-gray 

 appearance. Expanse about 22 mm. 



Distribution: California, June and July; Utah, June. The type 

 locality is Mt. Shasta, where the types were taken at an altitude of 

 6,700 ft. 



18. Platyptilia albidorsella Walsingham. PI. XLIII, fig. 9. 

 Platyptilus albidorsellus Walsingham, Pter. Cal. Ore. 13, pi. I. f. 10, 1880. 

 tPlatyptilia albidorsella Fernald, Smith's List Lep. N. A. 87, 1891. 



Id., Pter. N. A. 30, pi. VIII, ff. 5-7, 1898. 

 Id., Bull. 52 U. S. N. M. 443, 1902. 

 Meyrick, Gen. Ins. C, 11, 1910. 



