268 MEMOIRS OF THE XATIOXAL ACADEMY OF SCIENCES. 



setiferous tieshy tubercles, wliicli lie between the bases of the spiny anal legs or filaments, which 

 are about one-half or two-thirds as long as the bodj^, and yellow, with two broad browu rings, and 

 browu at the tip. Body greenish yellow, marked as usual with lilac-brown, this tint mimicking 

 the dead, withered browu of the edge of ])oplar leaves of late summer; it is a dark lilac-brown 

 with reddish browu and lilac brown patches, and in this way the caterpillar mimics the dead 

 stained portion of tlie leaf on which it feeds and thus escapes observation. From head to end of 

 mesothoracic segment a brown patch, succeeded by a pointed brown baud -which extends to the 

 base of caudal appendages, but contracted on the eighth abdominal segment, the dorsal tubercles 

 of which are yellow. 



Larva after last moU. — 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, with 

 faint traces of broken yellow lines in the middle of the body. 



Cocoon. — "Like those of the other species of Cerura, but rather flatter for its size. Length, 

 38 mm. ; width, 11 mm. ; height above the surface of the wood, 6 mm." (Dyar.) 



Puim. — "Cylindrical, flattened a little on the ventral side, the ends rounded, not tapering; 

 cases prominent, those covering the anteuuiii large; a slight depression behind thorax dorsally ; no 

 cremaster; color, red brown; cases finely wrinkled; dull; body smooth, slightly shiny. Length, 

 17 mm.; width, 5mm." (Dyar.) 



Hahits. — The caudal appendages are soft and extensible on their outer third, forming the 

 " flagellum," and are quickly jerked up wheu the creature is disturbed ; they are evidently delicate 

 repellant organs. 



The close resemblance in the lilac-brown p.atehes of this caterpillar and others of the genus to 

 the sere and brown edges of certain of the leaves is remarkable, and plainly enough serves 

 to protect the caterpillar from observation. I have observed the same in other Notodontians, 

 especially ^cliiznra unicornis and allied forms. 



Food plant. — Species of wild cherry (Oerasus). In Edwards's Bibliographical Catalogue of 

 the described Transformations of North American Lepidoptera, page 70, the word "Salix," should 

 be replaced by "Cerasiis," in liue 13 from the bottom of the page. 



Geographical distribution.— 'Maiim (Packard); Franconia, N. II. (Mrs. Slosson); Massachusetts 

 (Harris). Lintner gives the following localities for C. horealis (emend.) : " New York, Pennsylvania, 

 Virginia, Washington, D. C, Georgia, Missouri, August 2(5, at light (Eiley)." Plattsburg, N. Y. 

 (Hudson); Illinois (Dyar); Ormond, Fla., darker than theonefrom Francouia, N. H. (Mrs. Slosson); 

 New York, Wisconsin, Carboudale and Champaign, 111. (French); Chicago; 111. (Westcott). 



Cerura ocoidentalis Liiitucr. 

 (PI. VI, fig. 15.) 



Cerura borealis (in part, auil cinerea) Harris, Rep. Ins. Mass., p. 306, 1841; Treatise Ins. Inj. Veg., 3<1 edit., 



p. 423, 1862. 

 Cerura oceidentalia Lintner, Ent. Contr., iv, p. 82, June, 1878. 



Grote, Now 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. 



Neum. and Dyar, Trans. Amer. Ent. Soc., xxi, p. 189, June, 1894; Jourii. X. Y. Ent. 

 Soc., ii. J). 114, .Sept., 1894. 



( Larva. 



French, Can. Ent., xiii, p. 144, 1881. 



Paclcard, Fifth Rep. U. S. Ent. Comm., p. 565, 1890 (description copied from French) (PI. XI. fig. 7, from 

 a colored drawing by Dr. Lintner. This is more probably cinerea or lorealh.) 

 Proc. Bost. Soc. Nat. Hist., xxiv, p. 554, 1890 (Stages II, III). 



3foth.— 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 which 

 are yellow scales; black over the scutum. Fore wings ashy white, outer edge and base sordid 



