138 ■ MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Fourth shuje. — Head rounded, clypeus depressed, median sutuif deep; hair short, dense, white; color black, 

 sliglitly sliiny, l)rownish centrally in the depression around the median suture; width, 3 mm. AVarts rather large, 

 rows i and ii on joints 3, 4, 6, 9, 10, and 13 and all the subventral warts yellow, the others hlaik. Joints 5 and 12 

 eularijed dorsally, velvety black. Color purplish black, a bro.id, yellow, dorsal band, except on joints 5 and 12, 

 containing a broken, triple, dorsal line, fainter on joints 7, 8, and 11. The rest of the body is purplish black, the 

 subventral region included. Hair dense, white, consisting of fine short hairs from the body, with single, slightly 

 longer and larger ones from the warts. As the stage advances a marked change takes jilace. Abroad pale gr.iy 

 dorsal band, containing very faint triple ilark line, obsolescent and broken; warts i and ii orange, except on joints 2 

 and .5, row ii on joints 3, 4, 6, 9, 10, and 13 broadly orange ; a broad, jialc. blui.sh, subdorsal baud, heavily mottled with 

 vinous Vdack; joints 5 and 12 dorsally, and lateral spots on all segments (umst distinct on joints 3-3), velvety black. 

 A broad, broken, deep orange, stigniatal band, divided by an irregular black stigmatal line and ccmsisting of orange 

 spots spreading from the warts of rows iv and v and adjacent mottliugs, barely couHuent. Venter blackish ; thoracic 

 feet shiny black. 



Cocoon. — Not different from the house made at the end of each stage, excejit that there are a few transverse 

 threads to support the pupa. 



Pupa. — Small but robust. Dorsal outline arched, ventral nearly straight, rounded at Viotlicnds; cremaster. a. 

 long spine of even thickness throughout, smooth, shining; abdomen very slightly punctured. Color red-brown, 

 darker ventrally and dorsally, nearly black ou the thorax and cases, with a green tinge (ml the lalter. Li'Ugtb, 

 13 nun. ; width, 4. -5 mm. There are two broods each year. 



Food phtnt. — Willow (Salix). 



Habitat. — Oregon and Washington west of the Cascade range and, probably, also western Bi'itish Columbia. 

 Found by Prof. O. B. Johnson at Seattle, Wash. Larva from Portland. (Dreg. (Dyar.) 



Ichthyura albosigma (Fitch). 

 (PI. Ill, ligs. 27-30). 



Closiera alhosiijina Fitch, 2d Rep. Xox. Ins. N. York, p. 274, pi. 2, lig. 4, 185.5; 5th Rep. Nox. Ins. N. York, 



p. 64, 1859. 

 Ichthyura albosit/ma ilorris, S.vnopsis Lep. X. Amer. , p. 244, 18t)2. 

 Pack., Proc. Ent. Soc. Phil., iii, p. 352, 1864. 

 Grote, Cheek List N. Amer. Moths, p. 18, 1882. 



Pack., 5th Rep. U. S. Ent. Com. Forest Ins., p. 454, 1890 (figure of moth in text). 

 Smith, List Lep. Bor. Amer., p. 29, 1891. 

 Melalopha albosiijma (sic) Kirby, Syn. Cat. Lep. Het., 1, p. 610, 1892. 



var. specifica, I)yar, Can. Eut.,xxiv, p. 180, .July, 1892. 



Neum. and Dyar, Can. Ent., xxv, p. 122, 1893; Trans. Amer. Ent. Soc, xxi, p. 191, 1894; 

 Jouru. X. Y. Ent. .So.'., p. 114. 1894. 



Larva. 

 (PI. XYI, ligs. 3. 3a, 3/i, 4, 5.) 



Filch, 2d Rep. Nox. Ins., p. 274, 1855 (egg, full-fed larva, cocoon); 5th Rep. Xox. Ins. X'. Y'ork. ji. 04, 1859. 

 I'arkard, Jour. N. York Ent. Soc., i, p. 27, March. 1893 (three last stages described). 



Moth. — Several S and 9 . AViag.s le.ss ochei'oiis tliaii in /. iiichisa, quit'' clear, and batlied with 

 a .sligiit lilac tinge. The dark brown thoracic band is wider, more triangular in front than in 

 I. inclnsa and (ipicalis, extending on the low thoracic tuft a.s a broad cordate coiicolorou.s mark. 

 Fore wings, with the basal and second lines distinct and parallel, crossing the entire wing, the basal 

 line not being di.slocated. The third line, reaching oid.v as far as the subcostal vein, slightly 

 bent, connected at its base with tlie fourth line and forming a narrow obscure V, very different in 

 shape from that of the other species. The outer or fourth lino, i)assing forward from the liinder 

 edge of the wing, curves outward on the fourth subcostal venule, where it becomes a white V-sliaped 

 mark, the deep, large sinus being filled in with a large patch ol' reddish vandyke brown, the patch 

 being bounded beiund by tiie cubical vein. From this sinus the line obliquely retreats t() the 

 costa, after fornuug a very distiiH:;t subcostal loop. Beyond the loops and sinus tlie wing is 

 brownish to the edge, including the apical region. Discal spot formhig a faint line with a second 

 inner parallel one. An obsolete dark submarginal diffuse line, paler within. Hind wings with 

 no line, quite pale. 



Beneath, light clay-yellow, with no conimon line; the outer line shows faintly, while tlie 

 broad costal whitish mark is quite distinct tlii-ough the wing: costa ferruginous. The abdominal 

 tuft edged with dark brown, much as in the otlier species. 



