341 



25. Platyptilia petrodactyla Walker. PI. XLIV, fig. 7. 

 Pieroplwrus petrodactylus Walker, List Lep. Ins. B. M. XXX, 940, 1864. 

 Plalyftilus petrodactylus Walsingham, Pter. Cal. Ore. 20, pi. II, f. 15, 1880. 

 tPlatyptilia petrodactyla Fernald, Smith's List Lep. N. A. 87, 189L 



Id., Pter. N. A. 31, 1898. 



Dyar, Proc. Wash. Acad. II, 499, 1900. 



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



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



Id., Wagner's Lep. Cat. pars 17, 16, 1913. 



Barnes & McDunnough Check List 150, 1917. 

 Primaries powdery gray. Cleft preceded by a faint transverse dash and 

 a few black scales. Both lobes crossed by a pale outer line, preceded in the 

 second by two dark dashes and in the first by a heavy black dash, very oblique, 

 running toward base of cleft and in turn preceded by a pale costal area. Sec- 

 ondaries concolorous, third feather with a few scattered blackish scales in 

 fringes of inner margin. Expanse about 25 mm. 



The male genitalia agree with those of Carolina and the albida 

 group, but in our .single slide we are unable to be certain of the shape 

 of the uncus. 



This species was described from '"Arctic America," and is known 

 to us through two specimens from Dawson, Alaska, taken June 20, 

 1916. These were presented to the National Museum by Mr. B. P. 

 Clark, and through the courtesy of the staff of that institution, one 

 is now in the Barnes collection. Mr. Meyrick has verified our identi- 

 fication by comparison with Walker's type in the British Museum. 

 Dyar records three specimens taken on Popof Is., July. 



Walsingham's figure, presumably drawn from the type, is much 

 paler than the Alaskan specimens, but agrees in essential features. 

 We regard the heavy oblique dash as a sufficient distinguishing fea- 

 ture. It is conspicuous and easily separates this froin all of our other 

 species, since they are marked in the same place by either transverse 

 shades or longitudinal dashes. 



Nothing is known of the early stages. 



26. Platyptilia albicans Fish. PI. XLIII, fig. 11. PI. L, fig. 12. 

 Platyptilus albicans Fish, Can. Ent. XIII, 71, 1881. 



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

 Id., Pter. N. A. 32, pi. VIII, ff. 12, 13, 1898. 

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

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

 Id., Wagner's Lep. Cat. pars 17, 15, 191.1. 

 Barnes & McDunnough, Check List 150, 1917. 



