MEMOIRS OF THE natio:n^al academy of sciences. 273 



Var. moHesta, at Francoiiia, N. H. (Mrs. Slosson); Plattsburg, X. Y. (Hudson, TTidted States 

 ^National Maseum); Providence, E. I. (Clark); Kittery, Me. (Tbaxter); Saratoga Springs, N. Y. 

 >(McKuiglit). 



The normal aquihnaris, at JMontreal, Canada (Lintner); Canada, Maine, Xew York, Colorado 

 (Freucli); Colorado (Ilulst); Denver, Colo., April oO, at ligbt ((iillette); Olymjua, Wash. (T. Kin- 

 ■caid); Miles City, Mont. (Wiley ex Dyar); Taos, N. Mex. (Lieutenant Carpenter, Wheeler's 

 exi)edition); Mendocino County, Cal. (Walsinghani ex Butler); "Oregon and California" (Dyar); 

 normal form scoloponlriiut, Onkhiud, Gi\\., Yosemite, Cal., I'orthmd, Oreg., April 24; Nanaimo, 

 British Columbia, Manitou, Colo., May 3; Miles City, Mont. (Dyar); var. albicoma, Denver, Colo., 

 April 29 (Dyar); Colorado (Palm); Calgary, Alberta (F. H. Wolley Dod). 



Cerura cinerea Walker. 

 (PI. A'l, tigs. 16-20; PI. VII. fig. 30.) 



Cerura cinerea Walk., Cat. Lep. Het. Brit. Mus., xxxii, p. 407, 1865. 

 Grote, New Check List N. Amer. Moths, p. 20, 1882. 

 Centra paradoxa Behr, Bull. Cal. Acad. Sci., p. 6-1, 1885. 

 Cerura ciiiereoides Dyar, Can. Ent., xxii, p. 253, Dec, 1890. 



Druee, Biologia Ceiitr. Amer. Het., i. p. 241, 1887. 



Smith, List Lep. Bor. Amer., p. 31, 1891. 



Kirby, Syn. Cat. Lep. Het.. i, p. .588, 1892. 

 Cerura meridionalis Dyar, Psyche, vi, p. 291, .Inly, 1892. 

 Heterocampa nirea Neum., Can. Ent., xxiii, p. 124, .June. 1891. 

 Cerura cinerea var. jjlacida Dyar. Psyche, vi, p. 291, 1892. 

 Cerura nirea Palm. .Journ. N. Y. Ent. Soc, i, p. 20, March, 1893, PI. I, lig. 8. 

 Cerura cinerea Neum. and Dyar, Trans. Amer. Ent. Soc., xxi, p. 190, 1894 ; Journ. N. Y. Ent. Soc, ii, p. 114, 1894. 



Larva. 

 ( PI. XXXVI, tigs. 4, 4a ; XXXVII. ) 



Edwards and Elliot, Papilio, iii, p. 130, Dec, 1883. 



Packard, Proc Bost. Soc Nat. Hist., xxiv, p. .555 (Stages II, V (last), and pupa), 1890. 



Dyar. Psyche, p. 80, 82, May, 1891. (Egg and all the larval stages, with cocoon and pupa descrilied in detail.) 



Miith — Two S , one 9 , and several others examined. The wing.s of tlie 9 wider and more 

 triangular than in C. scolopendriiia. Head and body uniformly ash gray to whitish gray. Thorax 

 pale gray, but with yellowish and steel-blue scales concealed by the long gray hairs. Palpi and 

 head smoky black. 



Fore wings with the markings very indistinct; the usual dot at base of wing; extrabasal 

 line of four dots, the line being much curved outward. Traces of a median band shaped as in 

 C. scolopendrina var. modesta, though the species seems nearer allied to G. scolopendrina. Xo extra- 

 discdl line, hut traces of an imperfect one of dots instead, and the discal dot either absent or only 

 a small blackish dot. The usual subajjical dark .shade is nearly obsolete and of the same shade 

 with the dusky outer edge. The marginal dots distinct. 



Hind wings uniformly white, with a small discal dot; the marginal dots jnesent. but none ou 

 the internal angle. Underside of fore wings uniformly dusky; a large distinct, but dirt'nse discal 

 spot, and an extradiscal diffuse wide dark shade. Hind wings a little whiter. Expanse of 

 ■wings, i 40 mm., 9 43 mm.; length of body, S IC mm., 9 IS mm. 



The Colorado examples are, so far as we have seen, somewhat larger than the Eastern ones, 

 the S expanding 40 mm. and the 9 43 mm. 



Besides being perhaps a little smaller, the S from Xew York (from Mr. Hulst) is darker and 

 the markings are more distinct than in the Colorado examples. 



I suspect that this .species has been derived from C. scolopendrina. wliicli seen]S nearest to it 

 in markings, its geographical range being al.so nearly coextensive with that widely diflused 

 •species. In two 9 Colorado specimens faint traces of the costal portion of the dark median and 

 subapical bauds are to be seen. 



Frt)ni an examination of C. paradojcaBehv, in Mr. Dyar's collection, 1 feel ijuite sure that it is 

 a very pale white variety of C, cinerea; and a more extreme form seems C «/(•«(, in which the 

 S. Mis. 50 18 



