342 



Creamy white, usually more or less discolored. Antennae with brown 

 dots above. Frontal tuft lacking. Palpi rather small and slender, but pro- 

 jecting well beyond front ; brownish on sides. Legs with brown stripes, hind 

 pair with brown shades. 



Primaries creamy white with white-irrorate brown areas, the two colors 

 about equally extensive. Both lobes with a terminal brown band and one just 

 before middle which fades out toward inner margin of wing. Costa brown 

 as far as base of cleft and inward to a transverse dash before cleft, this area 

 usually almost connected by brown with anal angle. Fringes white with gray 

 tips ; brown and white scales in bases along outer margin. Secondaries gray- 

 brown, either without dark scales in fringe or with a faint tuft of slender 

 scales, not visible without lens, near middle of inner margin of third lobe. 

 Expanse 17-24 mm. 



The male genitalia are somewhat similar to those of tcsseradac- 

 tyla, which agree also with the two following species, but possess dis- 

 tinctive features as iUustrated. This relationship suggests that tesscr- 

 adactyla should be associated with this and the other two species, but 

 its superficial characters lead us to leave it elsewhere. 



Distribution: Described from Nevada (Morrison). We have 

 five specimens from Verdi, Nev. June, one from Yellowstone Park, 

 VVyo., July, and two from Silverton, Colo. In the Fernald collection, 

 in addition to the unique 9 type, there is a specimen from California, 

 and we have identified a specimen from British Columbia for Mr. G. O. 

 Day. 



The last specimen mentioned, a 3 taken on Stoker's Mt., July 

 23, 1909, is anoinalous. We place it here with little hesitation, though 

 it is so much darker than the typical form that a casual examination 

 discloses little resemblance. It corresponds in essential features with 

 our series, but differs in having the brovv'n areas darker and more 

 extended, the pale areas consequently narrow and somewhat tinged 

 with brown. The tuft in the fringes of the secondaries is faintly visible 

 to tiie naked eye. 



Nothing is known of the life history. 



27. Platyptilia pallidactyla Haworth. PI. XLIV, fig. 3, 4. PI. 



L, fig. 11. 

 .Uiicita pallidactyla Haworth, Lcp. Brit. 478, 1812. 

 Ptcrophorus marginidactylus Fitch, Trans. N. Y. Agr. Soc. XIY, 848, 18S4. 



Id., 1st Rep. Ent. N. Y. 144, 1854. 



IMorris, Cat. Lep. N. A. 54, 1860. 



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



