2G8 
31EM0mS OF THE NATIONAL ACADEMY OF SCIENCES. 
setiferons flesliy tubercles, which lie between the bases of the spiny anal legs or iilaments, which 
are about one-half or two-thirds as long as the body, and yellow, with two broad brown rings, and 
brown at the tip. Body greenish yellow, marked as usual with lilac-brown, this tint mimicking 
the dead, withered brown of the edge of ])oi)lar leaves of late summer; it is a dark lilac-brown 
Avith reddish brown and lilac broAvn patches, and in this way the caterpillar mimics the dead 
stained portion of the leaf on Avhich it feeds and thus escapes observation. From head to end of 
mesothoracic segment a brown patch, succeeded by a i)ointed brown baud which extends to the 
base of caudal appendages, but contracted on the eighth abdominal segment, the dorsal tubercles 
of which are yelloAV. 
Larva after laM molt, — Length, except caudal appendages, 17 mm. Differs from foregoing 
stage in the prothoracic spiny horns being replaced by smooth, shining tubercles with faint traces 
of the spines of the former stage; the sides of the thoracic segments more distinctly spotted, Avith 
faint traces of broken yellow lines in the middle of the body. 
Cocoon , — “Like those of the other species of Cenira, but rather flatter for its size. Length, 
38mm.; width, 11 mm.; height above the surface of the Avood, Gmm.” (Dyar.) 
P»|;a. — “Cylindrical, flattened a little on the ventral side, the ends rounded, not tapering; 
cases prominent, those covering the anteiime large; a slight depression behind thorax dorsally; no 
cremaster; color, red brown; cases finely Avriukled ; dull ; body smooth, slightly shiny. Length, 
17 mm.; width, 5mm.” (Dyar.) 
Uahits , — The caudal appendages are soft and extensible on their outer third, forming the 
“ flagellum,” and are quickly jerked ui) Avheu the creature is disturbed ; they are evidently delicate 
repellant organs. 
The close resemblance in the lilac-brown patches of this caterpillar and others of the genus to 
the sere and l>rown edges of certain of the leaves is remarkable, and plainly enough serves 
to protect the caterpillar from observation. I have observ^ed the same in other ^7otodontians, 
especially Schizura unicorni'i and allied forms. 
Food plant — Species of wild cherry (Cerasus). In Edwards’s Bibliographical Catalogue of 
the described Transformations of North American Lepidoptera, page 70, the word “Salix,” should 
be replaced b}^ “Cerasus,” in line 13 from the bottom of the page. 
Geographical disti'ihution , — Maine (Packard); Franconia, N. TT. (Mrs. Slosson); Massachusetts 
(Harris). Lintner gives the following localities for C. borealis (emend.) : “ New York, Pennsylvania, 
Yirginia, Washington, D. C., Georgia, IMissouri, August 26, at light (Piley).” Plattsburg, N. Y. 
(Hudson) ; Illinois (Dyar) ; Ormond, Fla., darker than the one from Franconia, N. 11. (Mrs. Slosson) ;. 
New York, Wisconsin, Carboudalo and Champaign, 111. (French); Chicago, 111. (Westcott). 
Cerura occidentalis Lintner. 
(PL VI, fig. 15.) 
Cerura horealie (in part, and citterea) Harris, Rep. Ins. Mass., p. 306, 1841; Treatise Ins. Inj. Veg., 3d edit.,, 
p. 423, 1862. 
Cerura occidentalis Lintner, Ent. Contr., iv, p. 82, June, 1878. 
Grote, New Check List N. Amer. Moths, p. 20, 1882. 
Smith, List Lep. Bor. Amer., p. 31, 1891. 
Kirby, Syn. Cat. Lep. Het., i, p. 588, 1892. 
Neuiii. and Dyar, Trans. Amer. Ent. Soc., xxi, p. 189, June, 1894; Journ. N. Y. Ent. 
Soc., ii, p. 114, Sept., 1894. 
Larva. 
French, C.an. Ent., xiii, p. 144, 1881. 
Fackard, Fifth Rep. U. S. Ent. Comm., p. 565, 1890 (description copied from French) (PI. XT, fig, 7, from 
a colored drawing by Dr. Lintner. This is more probably cinerea or horealis.) 
Proc. Boat. Soc. Nat. Hist., sxiv, p. 554, 1890 (Stages II, III). 
Moth , — One S , and others examined. Very distinct from C, horealis and scolopendrina. Head 
and collar dusky white; a black band crosses the thorax between the fore wings, behind Avhich 
are yellow scales; black over the scutum. Fore wings ashy Avhite, outer edge and base sordid 
