338 



(lisoal (lots on Ijotli pairs of wings, with a single dark wavy line half-way 

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

 Hind tibifB long, not dilated; tarsi longer than the tibiai. 



Lengtli ol' liody, S, 0.40: of fore wing, <?, 0.50; expanse of wings, 

 1.00 ineh. 



Brnnswick, Me., July 10, not eomuiou (Packard, Mus. Peab. Acad. Sc). 



This is an interesting species, witli 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 Cluene'e. Plate 10, fig. 56. 



Acidal'ta nivonaria Gucu., PUal., i, 409, 1857. 



AValk., Lcp. Het. Br. Miis., xxii, 723, 18G1. 



5 <? and 2 9 . — Of large size ; costa of fore wings much arched, espe- 

 cially near the base; apex subacute; outer edge full but not bent; hind 

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

 t()rmly snow-white, with no markings or discolorations. The front of the 

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

 discolored witli blackish, but the terminal joint is white. Fore wings slightly 

 discolored along the costa; four discal dots visil)le on the' under side, not seen 

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

 hind tiljia^ considerably swollen, with two jjairs of unequal spurs ; the tarsi 

 two-thirds as long as the tibiie. 



Length of liody, <f 0.50, 9 , 0.50 ; of fore wing, S , O.GO, 9 , 0.63 ; 

 expanse of wings, 1.20-l.o0 inches. 



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

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

 (Stultz). 



This species, wiiile closely resembling^, enucleata in size and the shape 

 of the wings, dill'crs in the narrower t^ont of the head, the more arched base 

 of the costa of the fore wings, and the jtresence of tibial spurs; it is much 

 slighter. Well-])reserved examples show the four dark discal dots and dusky 

 tint on the under side of \\\v, anterior tibitic and along the jialpi. Other 

 examples are inniuiculate, au<l justify Gnenc^e's remark that this is the only 

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



