338 



discal dots on both pairs of wings, with a single dark wavy line half-way 

 between the discal spol and outer edge of the wing, common to both wings. 

 Hind tibiae long, no! dilated; tarsi longer than the tibiae 



Length of body, <?, 0.40; of fore wing, <?, 0.50; expanse of wings, 

 1.00 inch. 



Brunswick, Me., duly 10, not common (Packard, Mus. Peab. Acad. Sc). 



This is an interesting species, with very small palpi, semitransparent 

 wings, much rounded at the apex and on outer edge of hind wings, with 

 two very faint, much waved, dark lines, the outer very distinct on the under 

 side, and with the hind tarsi longer than the tibiae. 



Acidalia nivosata Guenee. Plate 10, fig. 56. 



Acidalia uirosuria Giii'ii,, Phal., i, 499, 1857. 



Walk., Lop. Het. Br. Mus., xxii, 723, 1861. 



5 S and 2 9. — Of large size; costa of lore wings much arched, espe- 

 cially near the hase; apex subacute; outer edge lull hut not bent; hind 

 wings square, with a prominent angle in the middle. Body and wings uni- 

 formly snow-white, with no markings or discolorations. The front of the 

 head is rather narrow and white, the upper edge of the short, slender palpi is 

 discolored with blackish, hut the terminal joint is white. Fore wings slightly 

 discolored along the costa; four discal dots visible on the under side, not seen 

 above; some specimens are entirely white. Fore tibia' dusky on the inside; 

 hind tibiae considerably swollen, with two pairs of unequal spurs; the tarsi 

 two-thirds as long as the tibiae. 



Length of body, c?, 0.50, 9, 0.50; of fore wing, i, 0.60, 9, 0.63; 

 expanse of wings, 1.20-1.30 inches. 



London, Canada (Saunders); Essex County, Vt„ July 28 (Cassino) ; 

 Maine, August (Packard); vicinity of Boston, Mass. (Sanborn); Easton, Pa. 

 (Stultz). 



r J nis species, while closely resembling A. enucleata in size and the shape 

 of the wings, differs in the narrower front of the head, the more arched base 

 of the costa of the fore wings, and the presence id' tibial spurs; it is much 

 slighter. Well-preserved examples show the four dark discal dots and dusky 

 tint on the under side of the anterior tibia' and along the palpi. Other 

 examples are immaculate, and justify G-ueneVs remark that this is the only 

 example known to him of a Lepidopter "entirely white in all its parts". 



