MEMOIES OF THE NATIONAL ACADEMY OF SCIENCES. 
273 
Yar. modesta, at FraBcouia, N, H. (Mrs. Slosson); Plattsburg, N. Y, (HudsoB, Uaited States 
■NatioBal MuseuiB); ProvideBce, E. I, (Clark); Kitterj^, Me. (Thaxter); Saratoga SpriBgs, N. Y, 
(McKBiglit). 
The Bornial agiiUonariSj at MoBtreal, Canada (Liatner); Canada, Maine, New York, Colorado 
(French); Colorado (Hulst); Denver, Colo., April 30, at light (Gillette); Olympia, Wash. (T. Kin- 
caid); Miles City, Mont. (AYiley ex Dyar); Taos, N. Mex. (Lieutenant Carpenter, Wheeler’s 
expedition); Mendocino County, Cal. ('Walsinghani ex Butler); “Oregon and California” (Dyar); 
normal form sco/ope/idrinu, Oakland, Cal., Yosemite, Cal., Portland, Greg,, April 24; Nanaimo, 
Britisli Columbia, Manitou, Colo., May 3; Miles City, Mont, (Dyar); var. albicoincij Denver, Colo., 
April 29 (Dyar); Colorado (Palm); Calgary, Alberta (F. H. Wolley Dod). 
Cenira cinerea Walker. 
(PI. VI, figB, 16-20; PI. VII, fig. 30.) 
♦ 
Centra cinerea Walk., Cat. Lep. Het. Brit. Mas., xxxii, p. 407, 1865. 
Grote, New Check List N. Amer. Moths, p. 20, 1882. 
Cerura paradoxa Behr, Bull. Cal. Acad. Sci., p. 64, 1885. 
Centra cinereoidea Dyar, Can. Knt., xxii, p.253, Dec., 1890. 
Druce, Biologia Contr. Amor. Het., i, p. 241, 1887. 
Smith, List Lep. Bor. Araer., p. 31, 1891. 
Kirby, Syn. Cat. Lop. Het., i, p. 588, 1892. 
Cernra meridionalis Dyar, Psyche, vi, p. 291, July, 1892. 
Heterocampa nivea Neum., Can. Ent., xxiii, p. 124, Juno, 1891. 
Centra cinerea Yiir.2)Iacida Dyar, Psyche, vi, p. 291, 1892. 
Certira nivea Palm, Journ. N. Y. Eut. Soc., i, p. 20, March, 1893, PI. I, fig. 8. 
Centra cinerea Neum. and Dyar, Trans. Amer. Ent. Soc., xxi, p. 190, 1894 ; Jourii. N. Y. Ent. Soc., ii, p. 114, 1894. 
Larva. 
(PI. XXXVI, figs. 4, 4fl; 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 described in detail.) 
Moth — Two 3 , one 9 , and several others examined. The wings of the 9 wider and more 
triangular than in C, scolo 2 }€ndrina. 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 maiddugs 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, sooloperuh'ina var. modesta, though the species seems nearer allied to C. seolopendrlna, Yo e.vtra- 
discal Unej hut traces of an imperfect one of dots instead^ and the discal dot either absent or only 
a small blackish dot. The u.sual subajneal dark shade is nearly obsolete and of tlie same shade 
with the dusky outer edge. The marginal dots distinct. 
Hind wings uniformly Avhite, with a small discal dot; the marginal dots present, but none on 
the internal angle. Underside of fore wings 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 min., 9 43 min.; 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 S expanding 40 mm. and the 9 43 mm. 
Besides being perhaps a little smaller, the 3 from New York (from Mr. llulst) is darker and 
the markings are more distinct than in the Colorado examples. 
I suspect that this species has been derived from C, scolopendrina, which seems nearest to it 
in markings, its geographical range being also nearly coextensive with that widely diffused 
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 examination of C. paradoxa Behr, in Mr. Dyar’s collection, I feel quite sure that it is 
-a very pale white variety of G. cinerea 2 and a more extreme form seems <7. in which the 
S. Mis, 50 18 
