1 23 



costa to the middle of the inner edge, with a small tooth pointing inward just 

 above the internal vein ; outer line running straight from the outer quarter of 

 the costa in an oblique direction to the first median vein ; scalloped slightly in 

 the two succeeding interspaces; in the submedian interspace the line is 

 straight, directed a little outward ; the region between these two lines a little 

 darker ochreous than the rest of the wing, with two faint, parallel, median 

 hair-lines passing through it ; beyond, and especially toward the apex, the 

 wing is lemon-yellow, frosted with white; the apical, oblique streak white, 

 a little waved below; under the line deep-ochreous ; fringe whitish. Hind 

 wings whitish, with a faint outer line; in the male, tinted faintly with pale- 

 brown along the outer edge of the wing; beneath uniformly whitish, with two 

 brown hair-lines common to both wings, the inner obsolete away from the 

 costa, and a little scalloped on the hind wing ; discal dots dark, distinct 

 beneath on both wings. 



Length of body, <?, 0.60, 9, 0.43; of fore wing, $, 0.64, <?, 0.58; 

 expanse of wings, 1.20 inches. 



Newton, Mass. (Dr. Waters) ; Brookline, Mass., August 26 (Shurtleff, Bost. 

 Soc. Nat. Hist.) ; New Jersey (H. Sachs) ; Easton, Pa. (Stultz) ; Bailey's 

 Ranch, on South Park Road, twenty-five miles from the park, elevation 8,000 

 or 8,500 feet, Colorado Territory, August 29 (Mead) ; Victoria, Vancouver 

 Island July, (Gr. R. Crotch, Mus. Comp. Zool). 



This species is characterized by the frosted appearance of the wings, 

 the lines being edged with white ; by the third line on fore wings being 

 regularly curved outward, and not pointed and scalloped. The outer line is 

 less scalloped below the first median venule than usual, and the triangular, 

 deep ochreous, apical spot is very distinct. It is identical with the Euro- 

 pean P. tcstata, as I find by comparing our specimen with two from Europe 

 received from Dr. Staudinger. The hind wings are apt to be darker, more 

 yellowish, in American examples. 



Staudinger gives the following distribution : Central and Northern 

 Europe, excluding Halicia and (?) Hungary; Ural Mountains; Altai Mount- 

 ains; Amur. 



Larva. — "The caterpillar, when full-grown, rests in a straighl posture, 

 and does not tall off its food-plant when disturbed ; the head is Hat and por- 

 rected; the body is cylindrical, without humps. The head is putty-colored, 

 with darker dots and reticulations ; the body, also, is putty-colored ; the back 



