335 



Id., Wagner's Lep. Cat. pars 17, 14, 1913. 

 Barnes & McDunnoiigh, Check List 150, 1917. 

 fStcnoptilia coloradcnsis Grinnell, Can. Ent. XL, 321, 1908 (in part). 



Albidorsclla is closely related to the several preceding species, 

 but we do not doubt its distinctness. We have two specimens from 

 the Monache Meadows, taken in July, which, with two other Califor- 

 nian specimens in coll. Fernald, are very similar in appearance to 

 shastae as already described. One specimen from San Diego is much 

 brighter, approaching albida but more heavily marked and with less 

 whitish. The expanse of these specimens ranges from 27 to 30 mm. 

 We regard the faint scale tuft in the fringes of the third feather of 

 the secondaries as the distinguishing feature of the species. This tuft 

 is made up of slender dark scales and is not readily noticed without 

 the aid of a lens. It occurs just before the apex of the lobe, and is 

 preceded by only a few scattered dark scales. Such a tuft appears 

 in a few specimens which we refer to maca, but these may be separated 

 by their smaller size and the absence of a well defined costal triangle. 



The male genitalia resemble those of the preceding group. 



19. Platyptilia grandis Walsingham. PI. XLIV, fig. 6. 

 Platyptihis grandis Walsingham, Pter. Cal. Ore. 6, pi I, f. 5, 1880. 

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



Id., Pter. N. A. 30, 1898. 



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



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



Meyrick, Gen. Ins. C, 12, 1910. 



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



Barnes & McDunnough, Check List 150, 1917. 

 BufT. Antennae with brown dots above. Frontal tuft very short; palpi 

 moderate. Abdomen with subdorsal and lateral black spots in posterior mar- 

 gins of segments. Triangular spot on primaries light brown with its angle 

 opposite cleft blackish. Spot in cell blackish, light brown shades near inner 

 margin at one quarter from base and at middle. Both lobes with similar shades, 

 crossed by a whitish outer line. Fringes white, containing a row of blackish 

 scales along outer margin and a few clusters on inner. Secondaries pale, dull 

 brown, fringes with paler bases. Third lobe buff along inner margin, with 

 a few light brown scales in fringe. Expanse 36 mm. 



Distribution : Siskiyou Co., Cal. The three types were taken 

 on M'Leod Creek, near Mt. Shasta, and the one female in our pos- 

 session at Shasta Retreat, all in August. Its occurrence in British 

 Columbia is not improbable, but we cannot verify it. 



