MEMOIRS OF TUE NATIONAL ACADEMY OF SCIENCES. 
265 
Larva. 
(PI. XXXVI, lig8.1,la,2,2o,3,3«,6; XLrX,fig.2.) 
Griffithj Eng. Edit. Cuvier’s An. Kingdom, xv, 183*2, PI. XXXII, fig. oa. (So description.) 
Harris, Ins. iuj. Veg., 1st edit., p. 305, 1841. 
lAnfner, Ent. Coutr., iii, p. 151, lig, 11, May, 1874; Eut. Coutr., iv. p. 84, 1878. 
Frcnchy Can. Eut., xiii, p. 145, 1881. 
Packard, Fifth Rep. U. S. Ent. Comm. Forest Insects, pp. 434, 458, 530, 597 ; 1890. 
Proc. Host. Soc. Xat. Hist., xxiv, p. 552, 1800. 
Dijar, Cau. Ent., xxiii, p.83, April, 1891 (egg and larval Stages II, III, IV, V (and last); cocoon and pupa 
described.) 
Moth, — Two ^ , one $ , Female anteiiniv well pectinated. Head above white, each side in front 
black. Thorax in front to a little behind the base of the fore wings white, and behind edged with 
steel-blue metallic scales. Abdomen dull smoky gray, segments edged with whitej end of S 
abdomen white, Huffy, with a central dorsal black spot; end of $ dark brown, clothed with white 
and dusky scales. 
Fore wings in 6 white, in $ somewhat smoky. The median hlacl' hand with very irregular 
edgen^ both within and without; the band varies in being either narrower or wider on the costa 
than on the internal edge, and the edges are irregular, the band contracting in the snbraediau 
space and becoming hourglass-shaped, and edged more or less continuously on each side with 
yellow oclier. A black dot on the common origin of the subcostal and cubital veins; beyond is a 
series of four black dots forming not a straiglit but a sinuous line, one of each being situated on 
the costa, on the cubital and internal veins, and on the internal edge. 
A roundish, oval, small black discal mark. No distinct eMradiscal white hand like that in C,. 
occidentalism but a subapical black shade ending on the first cubital vein and edged within with 
dots of yellow ocher, succeeded behind by a black and yellow dot on the first, second, and third 
venules, and a large black patch edged with yellow within on the internal angle, the yellow spot 
being continuous with the yellow lining of the outer side of the median black band. The usual 
marginal row of coarse black dots. 
Hind wings Avhite, with a distinct discal mark; a dusky patch ou the internal edge, and a 
distinct row of black spots. In $ the hind wings are somewhat dusky, the discal mark larger and 
diffuse, and the outer third of the wing dusky white, while the spots in the smoky fringe are 
black and diffuse. 
Underside: Fore wings of male white, with three large equidistant costal black spots; from 
the third of. these on the outer fourth of the costa a broad sinuous dusky shade crosses the wing, 
losing itself ou the subiuedian fold. A submargiual dusky costal patch halfway between the line 
and the apex of the wing. Hind wings wliite, with a discal dot and one in the internal angle, and 
with black dots ou the base of tbe wliite fringe. Fore wings of $ more dusky than the hind wings;, 
no distinct sinuous line or black costal spots except those near the apex. Hind wings white,, 
with a large diffuse black discal mark ou each wing, and traversed by an extradiscal sinnons line- 
of diffuse dark dots. Expanse of wings, $ 38-42 mm., $ 43 mm.; length of body, S 13 mm., 
9 13 mm. iSIy specimens were so labeled by Riley, also by Edwards and Dyar, and the 9 in 
the United States National Museum was so labeled by Mr, Lintner. 
This species may be known by the irregular, hourglass-shaped median black band edged with 
ocher, by the inner baud of four black dots, and by the absence of an extradiscal line. 
The figure in Griffith’s Cuvier well represents the female. The statement made by Harris in 
his description of C, borealis, that the outer blackish band “is traversed and iuterru])ted by an 
irregular, wavy, whitish line,” shows that he had before him an exauix)le of C\ occidentalis, while 
those individuals before him with dusky wings and indistinct bauds are stated by Lintner to 
belong to C. cinerea. 
The caterpillars occurred at Providence, September 18 to 24; one cocooned September 21. 
The following account of the ontogeny of this species (identified from l^rofessor French’^ 
descrii)ti()ii) has been drawn up in part from alcoholic specimens and in iiart from greatly 
enlarged and most carefully executed drawings by Mr. J. Bridgham. The different stages. 
