MEMOIRS OF THE NATIOIS^AL ACADEMY OF SCIENCES. 273 



Var. mofhuta, at Francouia, N. H. (Mrs. Slosson); Plattsbiirg, N. Y. (Hudson, United States 

 JSTational Museum); Providence, E. I. (Clark); Kittery, Me. (Thaxter); Saratoga Springs, N. Y. 

 ^McKuigbt). 



The normal aquUonaris, at JNIontreal, Canada (Lintner); Canada, Maine, New York, Colorado 

 .(French); Colorado (Ilulst); Denver, Colo., April 30, at light (Gillette); Olympia, Wash. (T. Kin- 

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

 expedition); Mendocino County, Cal. (Walsinghaiu ex Butler); "Oregon and California" (Dyar); 

 normal form scoloiyendrinn, Oakland, Cal., Yosemite, CaL, Portland, Oreg., April 24; Kanaimo, 

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

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



Cerura cinerea Walter. 

 (PI. VI, figs. 16-20; PI. VII, fig. 30.) 



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

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

 Cerura paradora Behr, Bull. Cal. Acad. Sci., p. 64, 1885. 

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



Druee, Biologia Centr. 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, Ptsj'che, vi, p. 291, .July, 1892. 

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

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

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

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



Larva. 



(Pl.XXXVI, fig8.4, 4a; XXXVIL) 



Edwards and Elliot, P.apilio, iii, p. 130, Dec, 1883. 



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



Di/ar, P.syche, p. 80, 82, May, 1891. (Egg and all the larval stages, with cocoon and pupa described in detail.) 



Moth — Two <J , one 9 , and several others examined. The wings of the 9 wider and more 

 triangular than in C. scolopendrina. 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 ba.se of wing; extrabasal 

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

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

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

 a small blackish dot. The usual subapical dark shade is nearly obsolete and of tlie same shade 

 with the dusky outer edge. The marginal dots distinct. 



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

 the internal angle. Underside of fore wir'gs uniformly dusky; a large distinct, but diffuse discal 

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

 wings, $ 40 mm., 9 43 mm.; length of body, $ 10 mm., 9 18 mm. 



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

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



Besides being perhaps a little smaller, the $ from New 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 G. scolopendrina, which seems nearest to it 

 in markings, its geographical range being also nearly coextensive witli that widely diflused 



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

 subapical bands are to be seen. 



From an examiuation of C. paradoxaBehv, iu Mr. Dyar's collection, I feel (luite sure that it is 



• a very pale white variety of C cmerert; and a more extreme form seems C w/rea, in which the 



S. Mis. 50 18 



