264 
MEMOIRS OF THE NATIOI^AL ACADEMY OF SCIENCES. 
Coeootu — More dense and perfect than usual in other Notodontiaus; elliptical, hard, and 
dense, flattened, the edges broad and thin, surface above well rounded; closely resembling an 
excrescence on the bark of trees. 
Papa . — Body cylindrical, tapering at each end. “Eyes prominent, a narrow carinated ridge-, 
runs along the head from between the eyes to back of the place of origin of the antenuai” (Dyar). 
End of the body rounded and obtuse; cremaster not prominent, and with no traces of a spine or 
hooks, since the cocoon is so dense and perfect that the pupa can not fall out or be easily disturbed. 
“Pupation occurs in about two weeks after the completion of the cocoon, and the insects, 
remain in this stage throughout the winter.” (Dyar, Psyche, v, p. ^195.) 
Geographical cJistribution . — ^The species of this genus are to be found in the Old and New 
woxdds; but two occur in India, however, and the two Brazilian species are doubtfully referred* 
to Gerura by Walker, 
In North America it ranges throughout the entire continent north of Mexico, excluding the. 
arctic region, including the cold temperate subregion and warm temperate subregion and the 
humid provinces of the latter, and is represented by one species (cinerea f Druce) in the Mexican 
subprovince, and also in Guatemala. Its extreme northern and northw^estern range is not yet 
well known. Walker describes a form, perhaps G. occidentalism as a Amriety of G. hifidam from St.. 
Martins Falls, Albany Eiver, Hudson Bay. 
SYNOPSIS OF THE SPECIES. 
A. Foro w'iugs narrow, outer edge very oblique; discal mark a black dot. 
Median black baud very irregular on each, side, rudely hour-glass shaped; extrabasilar line consisting- 
of four dots; no extradiscal hues C, borealis 
Median black bfind broad, distinctly and evenly edged on each side with black; extrabasilar line of 
live dots; a distinct white broad scalloped extradiscal line V. occiHentalis- 
Median band usually narrow, much contracted or obsolete in the middle; three extradiscal scalloped 
dark lines C. scolopendrina 
Like scolopendrina, but the band and lines faded out; thorax all gray, and body and wings whitish gray. 
C. cinerea 
B. Fore wings broad, outer edge inclined to be less oblique; discal mark a ringlet. 
Forf wings with no median dark baud, but crossed by nine dark scalloped linea, the third and fourth 
uniting to form a series of ringlets; hind wings often dusky; thorax white, with transverse black 
lines scitiscripta 
SYNOPSIS OF THE KNOW'N LAKV^. 
With longer cervical shield and shorter horns in Stage III than in the corresponding stage ot' borealis. 
C. occidentalism 
Difiers from 'nmUiscripia in that the dorsal reddish patch in the middle of the body does not descend so far 
down on the side - - C. borealis 
Differs from C. borealis and occidentalis in the less connected and narrower dorsal lilac red patches, and in 
the end of the suranal plate being sqnarer than that of C. occidentalis C, cinerea 
Like borealis but paler, more purplish, and dorsal hump distinct * C. scitiscripta. 
Cerura borealis Boisduval. 
(PI. VI, figs. 10, 11,12.) 
Dicranoura borealis Boisd., Guerin. Icon. Regno Animal, t. 88, fig. 5, 1829, p, 519, 1844. 
Griffiths Cuvier’s Animal Kingdom, xv, 1832. PI. XXXII, fig. 5, 6a, larva. (Ko description.)!, 
Cerni-a borealis Morris, Syn. Lep. K. Amor., p. 238, 1862. 
Pack., Proc. Ent. Soc. Phil., iii, p. 375, 1864. 
Lintner, Rep. N. Y. State Museum, xxx, p. 196 (84), Juue, 1878. 
Grote, New Check Inst N. Amer. Moths, p. 20, 1882. 
Smith, List Lep. Bor. Amer., p. 31, 1891. 
Kirby, Syu. Cat. Lep., i, p. 588, 1892, 
Neum. and Dyar, Trans. Amer. Ent. Soc., xxi, p. 189, 1894; Joiirn. N. Y. Ent. Soc., ii, p. 114,, 
Sept., 1894. 
