138 
MEMOIRS OF THE NATIOXAL ACADEMY OF SCIENCES. 
Fourth stage . — Head rounded, clypeus depressed, median suture deep; hair short, dense, -white; color black, 
slightly shiny, brownish centrally in the depression around the median suture; widtli, 3 mn>. Warts rather large, 
rows i and ii on joints 3, t, 6, 9, 10, and 13 and all the subventral warts yellow, the others black. Joints 5 and 12 
enlarged doreally, velvety black. Color purplish black, a broad, yellow, dorsal band, except on joints 5 and 12, 
containing a broken, triple, dorsal line, faiiitor on joints 7, S, and 11. 'I’lio rest of the body is piir]>lish black, the 
subventral region included. Hair douse, white, consisting of line short hairs from the hody, with single, slightly 
longer and larger ones from the warts. As tlie stage advances a marked change takes jdace. Abroad pale gray 
dorsal band, containing very faint triple dark line, obsolescent and broken ; warts i and ii orange, excejit on joints 2 
and 6, row ii on Joints 3, 4, 6, 9, 10, and 13 broadly orange ; a broad, iiale blnisb, snbdorsal band, heavily mottled with 
vinous black; joints 5 and 12 dorsally, and lateral spots on all segments (most distinct on joints 3-5), velvety black. 
A broad, broken, deep orange, stigmatal band, divided by an irregular blacfc stigmatal line and consisting of orange 
spots spreading from the warts of rows iv and v and adjacent mottlings, barely conliuent. Venter blackish ; thoracic 
feet shiny black. 
Cocoon . — Xot diflerent from the house made at the end of each stage, except that there an^ a few transverse 
threads to support the pupa. 
Pupa . — Small but robust. Dorsal outline arched, ventral nearly straight, rounded at both ends; cremaster, o, 
long spine of even thickness throughout, smooth, shining; abdomen very slightly punctured. Color red-l»rown, 
-darker ventrally and dorsally, nearly black on the thorax and cases, with a green tinge on the latter. Length, 
13 mm. ; widtli, 4.5 mm. There are two broods each year. 
Food plant . — ^Willow (Salix). 
Jlahital . — Oregon and Washington west of the Cascade range and, xirohahly, also western British Columbia, 
Found by Prof. 0. B. Johnson at Seattle, Wash. Larva from Portland, Oreg. (Dyar.) 
Ichthyura aibosigma (Fitch). 
(PI. HI, hgs. 27-30). 
Closfera aibosigma Fitch, 2d Rep. Nox. Ins. N. York, p. 274, pi. 2, tig. 4, 1855; 5th Rep. Nox. Ins. N. York, 
p. 64, 1859, 
Ichthyura aibosigma Morris, Synojjsis Lep. X. Ariier., p. 244, 1862. 
Pack., Proc. Knt. Soo. Phil., iii, p. 352, 1861. 
Crote, Check List X. Amer. Moths, p. 18, 1882, 
Pack., 5th Rep. IJ. S. Eut. Com. Forest Ins., p. 454, 1890 (ligure of moth in text). 
Smith, List Lep. Bor. Amcp.. p. 29, 1891. 
Melalopha aibosigma (sic) Kirby, Syn. Cat. Lep. Het., i, p. 610, 1892. 
var. specifica, Dyar, Can. Eut.,xxiv, p. 180, July, 1892, 
Xeum. and Dyar, Can. Kut.,xxv, p. 122, 1893; Trans. Amer. Ent. Soc., xxi, j). 191, 1894; 
Jouru. X. Y. Ent. Soc., p. 114, 1894. 
Larva. 
(PL XVI, iigs. 3, 3rt, 3&, 4, 5.) 
Fitch, 2d Rep. Xox. Ins,, p. 274, 1855 (egg, full-fed larva, cocoon); 5th Hep. Xox. Ins. X. York, p. 64. 1859. 
Packard, Jour. X. York Ent. Soc., i, p. 27, March, 1893 (three last stages jh-serilied). 
— Several S and $ . AViugs less ocdierous than in L tnclusa, quite clear, and bathed with 
a slight lilac tinge. The dark brown thorac.ic band is wider, more tii:nignlar in front than in 
I. incJutifi and aptcalis^ extending on the low thoracic tuft as a broad cordate concolorous maik. 
Fore wings, with the basal and second lines distinct and parallel, erossing the entire wing, the basal 
line not being dislocated. The third line, reaching only as far as the subcostal vein, slightly 
bent, connei'ted at its base with the fourth line and forming a narrow obscure V, very different in 
shape from that of the otber species. The outer or tiourth line, ]>assing forward from the hinder 
edge of the wing, curves outward on the tburth subcostal venule, where it becomes a white V-shaped 
mark, the deep, large sinus being filled in with a large patch of reddish Vandyke brown, the patch 
being bounded behind by the cubical vein. From this sinus tlie line obliquely retreats to the 
costa, after forming a very distinct subcostal loop. Beyond the loops and sinus the wing is 
brownish to the edge, including the apical region. Discal spot forming 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 common line; the outer line shows faintly, while the 
broad costal Avhitish mark is quite distinct through the wing; costa ferruginous. The abdominal 
tuft edged with dark brown, much as in the other species. 
