MEMOreS OF THE NATIONAL ACADEMY OF SCIENCES. 167 



I'lipd. — S . ]'>i)(ly nitlicr slender, much as iu Lophodoiita. Head nimided as usual. Abdiuniiial 

 segments smooth, spaisidy. and finely i)ittiHl; end of tlie abdomen smootli, ending- in a shoit, veiy 

 broad, crenuister, bearing lu-ar tlie outer edge on tlie underside tour or live sliorfc spine.s and with 

 two spines, one on each side, at the end. V(\stiges of the larval male sexual a])erture with an oval 

 aiea on each side. Length, 17 mm. 



Food plants. — Willow and poplar. 



Habits. — Tlie cateri)illar of tliis luoMi has been reared by ^Ir. Tepper iu Xew York. It was 

 found on the poplar July 4, the motii ap])earing July L'7. (Bull. Ent. Soc. Broolilyn, i, 10.) 

 Messrs. Edwards and Elliot have found the food plant to be the willow. 



This singular cateri)illar is not unconunon at Brunswick, ^le., late in August. It has the 

 peculiajrity of raising and depressing the two large dorsal horns in the middle of the body; when 

 at rest they are depressed, appearing simply as humps; when erect they are somewhat larger and 

 evaginated. with their psendojoints like those of a telescope; probal)ly they serve to frighten away 

 ichneumons. IMy specimens molted for the last time August 31. 



A caterpillar of this species was observed feeding on the extremity of a partially eaten leaf 

 of pojilar, and its oblicjue markings bore a striking resemblance to the twisted, partly dead, and dry 

 jKution of the leaf. The larva stood feeding in a very conspicuous position, ami would easily be 

 mistaken for an end of the poplar leaf. 



The larva occurs in IMarch, May, June, July, August, and September. (Eiley MS.) 



Geographical <listrihution. — This species is not uncommon in Maine, Canada, and southern Xew 

 England, inhabiting the Appalachian suljprovince. (Jrono, Me. (Mrs. Fernald); Brunswick, Me. 

 (Packard) ; Amherst, Mass. (Mrs. Fernald) ; Brookline (Shurtleff) ; Williamstown, Mass. (Nason./i(/e 

 Grote); New Jersey (Palm); Chicago, 111. (Westcott); Brooklyn, N. Y. (Tepper, Elliot); Plattsburg, 

 ISI. Y. (Hudson); Xew Y<u-k, Canada. Pittstield, N. H.; Maine (U. S. Nat. Mus.); Canada, Maine, 

 Massachusetts, AViseousin, Tiffin, Ohio; Champaign, HI. (French). The dark form jwc(/(.ca Behr 

 occurred in Placer County, Cal. 



Notodoiita simplaria Graef. 

 (PI. IV, iig. G.) 



JS\)loilnnta simplaria Graef, Bull. Ent. .Snc. Brooklyn, iii. p. 95. IS.Sl, pi. 1. (The fisure scarcely rccogniz.able.) 



Grote, Check List N. Amer. Jloths, p. 18, 1882. 



Smith, List Lep. Bor. Amer., p. 30, 1891. 



Kirby, Syn. Cat. Lep. Het., i, p. 601, 1892. 

 Pheosia simplaria Neum. and Dyar, Trans. Amer. Ent. Soc, xsi, p. 195, 1894; Journ. X. Y. Ent. Soc, ii, p. 

 113, Sept., 1894. • 



This is a true Notodonta. The auteinne are pectinated in the same manner. Fore and hind 

 wings a little sharper at the apex, especially the hind wings, hinder edge of collar and inner 

 edge of ])atagia black, and a black spot over tlie scutellum. Thorax gray, dark behind. 



Fore wings granite ash-gray, and rather dark, blackish at base. On the inner third' of the 

 wing is a transverse scalloped line, the end of the line oblique, directed inward, and ending on 

 the short broad tuft. A distinct linear discal spot encircled by whitish scales. PLxtradiscal line 

 much excurved, so as to reach a point halfway between the discal spot and the apex of the wing; 

 it is not wavy iu its oblique course in the median interspace, but scallo])ed on the subinedian 

 space, and ending on the hind edge in a distinct, not wavy line, exactly parallel with that ending 

 on the tooth. A submarginal row of dusky iutervenular round .spots; fringe white, with seven 

 black dots. Hind wings whitish, a linear diffuse discal discoloration, but with no transverse 

 diffuse median band. 



Underside of the wings unifonnly jiale whitish gray, a ditfuse dark extradiscal line, with 

 discal spots. (Descriptimi drawn up from a $ compared by Mrs. Slosson with Mr. Graef's type.) 



Expanse of wings, $ , 4S-5() mm.; length of body, S ,19-20 mm. 



Geographical diistribution — Catskill, N. Y., August (Graef); St. Johns, New Brunswick 

 (H. Edwards); New York (French). 



^OTE.— Notodonta plagiata Walk., Cat. Lep. Het. Br. iMus., vii, p. 1719, ISM, belongs to the 

 JEuropean Y. tritophus (tide Grote and Eobinson), with an erroueous locality. 



