272 MEMOIES OF TOE XATIOXAL ACADEMY OF SCIENCES. 



conical tubercles, each with a short spine, tnln'r<-lcs one and two on joints (! anil 7 lar;;er than the others. Cervical 

 shiehl colored like the head; horns rod-hrown, their tnlicrcles paler; body green, ii broad red-brown dorsal band, 

 very narrow and nearly obsolete on joints 3 and 4, widenin<; into an elliptical patch on joints 5-11 and inclosing on 

 joints 7 (posteriorly), 8, 9, and 10 (anteriorly) a patch of the ground color, faintly bisected by a brown dorsal line. 

 On joints 12 and l'^ the band is faint, only tinging these segments. 'I'ails red-brown, twice auuulated with green; 

 length, ■1..'5 mm. Five days after the molt, the following des<'ription was made: Hody highest at joint 3 posteriorly; 

 a red-brown dorsal band begin.s widely on joint 2, covering the horns, narrows to a line on joint 4, rapidly widens 

 anil reaches the spiracle on joint 8; then narrows to a line on joint 12 and, widening again, covers the anal plate. 

 It is edged with yellow and contains, on joints G-9, an ocherons yellow jiatch which is broken by a narrow, brown 

 dorsal lim^ and the brown tubercles. The sides of the body are clear green, dotted with yellow. The anterior 

 aiinnlation of the tails is yellowish, the posterior one yellow. Venter, especially i)osteriorly. whitish. .Joint 2 

 edged with yellow at the sides anteriorly. 



Foiirlh Hidfir. — Head partly retracted beneath joint 2. shapeil as before and ccdored much the same, but yellow 

 on the sides jiosteriorly ; mouth parts whitish; a few ]piliferous tubercles; width, l.fl nnu. I'rothoracic horns thick, 

 pointing forward, covered with piliferons tubercles. The tubercles on the body are short, but bear stilf lilack set;p. 

 They are concolorous with the markings escejit tubercles one and two on joints (S, 7, 10, and II, which are larger 

 than the rest and blackish. Tails covered with spines which arise from enlarged bases. Body marked as in the last 

 jiart of the previous st.age except that the paler patch on joints 6-11 is more brownish, and the anal plate is 

 tinged with yellowish. Tails 5 mm. long, the extensile threads black, but white at base and middle. 



Two days after the molt the markings had more the appearance of the last stage, the centr.il jiatch (that part 

 of the band on joints 4-11) being slightly indented along its edges in each segmental incisure. 



Fifth staye. — Head partly retracted below joint 2, rounded, higher than wide; clypeus small, depressed; red- 

 brown, the upper two-thirds, except the clypeus, covered with little, round, yellowish dots, but leaving an obscure 

 line of the ground color on each side of the median suture; yellow at the sides posteriorly ; month ]i;irts pale, jaws 

 brown, antenna' yellowish; width, '^ mm. Cervical shield large, horns short, rouiuled, smooth, without tubercles 

 but sparsely punctured. Piliferous dots absent, the seta' short and fine. Tails spinoso, turned U]) at the end. Rody 

 pale yellow, thickly sprinkled with little whitish and brownisli dots, not very distinct; spiracles pale brown; a 

 subventral row of brown spots corresi>oiidiug to legs on the jiosterior apodal segments, and a luedio-ventral line 

 posteriorly. Dorsal band ferruginous brown, consisting of three connected pati'hcs; the first triangular, covering 

 the horns, marked like the head on joint 2 and narrowing to a line .it the elevation ,it joint 3 posteriorly; the second 

 widens rapidly, reaching below the spiracle on. joint 8, and narrows to a line on joint II posteriorly, being incised 

 on its edges in the segmental sutures, shaded with blacki.sh brown around its borders, and containing a darker dorsal 

 and oblifiue suljdorsal line, beside brown dots representing the tubercles ; the third, on joint 12 jiosteriorly and joint 

 13, elliptical, covering the anal plate, but largely replaced by whitish. All the patches are bordered by a eontinuous 

 yellow line. Tails brown, green below at base and twice annulated with yellowish green; length. 6 mm. 



As the stage advances a purplish tint suffuses the dorsal patches, the second one becomes darker, obscuring its 

 markings, but three pale orange patches appear in it on each side, behind the former obliciue subdorsal lines, distinct 

 or confluent and becoming pinkish ytdlow. There is a narrow, reddish edging inside the now obscure yellow border. 



Cocoon. — Made, as usual in the genus, of pieces of bark and wood spun together over the hollow in the wood 

 from which they wore bitten out by the larva. The cocoon is not so thick as that of Ceriira miilliscriplii, and it can 

 be indented by the linger. It fits the pnp.a closely. 



Pupa. — Cylindrical, slightl .' fiattencd ventrally, thi: ends rounded; no cremaster. Color shining blackish brown, 

 the cases darker, almost black, wrinkled, and less shining than the abdomen. Length, 14 mm. ; width, 4.5 mm. 



Food plinit. — Willow (.^alix). Larva' from Yo Semite, Cal. 



If the larva- here described are not difl'erent from those of Centra hicuspix Rorkh. (which I can not determine at 

 ])re8ent), then the name scolopendnna must be referred to the synonymy; for all the characters of the European 

 species are exhibited in a series of specimens before me which were collected in California, Oregon, and^olorado. 

 I am satisfied that C. albicoma 8trecker is only a, varietal form, the transverse band of the fore wings tending to be 

 narrower. 



Food plant. — Populus (Tluixter). 



ITahif.s. — The moth (var. moflesfo) occurred at Plattslmrg-, X. Y., and at F'raiicoiiia, ai)i)earing 

 very early in the season, one beinj^- taken by Mr. llndsoii at light May 1."), May to June L'O, while 

 "occ/fZert^rtr/.s" has not been taken before May 11, and cinerea and borealk not before the 28th. At 

 Taos, N. Mex., the normal form was captured by Licntenjint Car])entpr July 14. It is to be noticed 

 that the normal MjuUonnrh is i)aler, whiter, with less heavy black marks than modoita, and is 

 most common in the West in the arid region, as well as at Washington, on Puget Sound, while 

 modeata is, so far as known, conlined to New I'higland, and the darker forms iif it to the cool and 

 damp region of the White Mountains. 



(rcofiraphical distribution. — Its raiige is very extensive, passing from the noitlieru limits of 

 the Uudsonian fauna, if Franconia, N. H., be regarded as an outlier of that assemblages, and 

 extending throughout the Carapestrian subprovince westward to the Pacific Coast, through Cali- 

 fornia, Oregon, and Washington, and southward into New Mexico. 



