138 MEMOIKS OF THE NATIONAL ACADEMY OF SCIENCES. 



Fourth s/flje. — Ileail roiimletl, cl.vpeus depressed, iniMlian siitiin' d.ep ; liaii- short, douse, wliiti': color liiaok, 

 sli^ilitly shiny, l)rowiiish centrally in tlie depression around the median sntnre; width, '.i mm. Warts ratlur larjie, 

 rows i and ii on joints S, 4, 6, 9, 10, and 13 ami all the siilivnitral warts yellow, the others black. Jidiits .'i an4l 12 

 enlarj;rd dorsally, velvety Idack. Color purplish black, a broad, yellow, dorsal baud, except on joints o .and 12, 

 eontainiiiit a lirokeu, triple, dor.sal line, fainter on joints 7, 8. and 11. The rest of the body is purplish black, the 

 subvcntral region included. Hair dense, white, consisting of line slnirt hairs from the body, with single, slightly 

 longer and larger ones from the warts. As the stage advances a marked change takes jilace. Abroad ])ale gr:iy 

 dorsal band, containing very faint triple dark line, obsolescent and broken ; warts i and ii orange, e.xci'iit on joints 2 

 and 5, row ii on joints 3, 4, G, 9, 10, and 13 broadly orange ; a broad, pali^ bluish, sulidorsal band, heavily mottlc<l with 

 vinous black; joints 5 and 12 dorsally, and lateral spots on all seguu'uts (most distinct on joints 3-.5). velvety black. 

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

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

 feet shiuy black. 



CoeooH. — Not dift'erent from the house made at the end of each stage, excej)! tliat there arc- .-i few transverse 

 threads to support the pupa. 



I'lijia. — Small but robust. Dorsal outline arched, ventral nearly straight, rcunidccl at liothcnds; crcniastcr, a 

 long spine of even thickness throughout, smooth, shining; abdomen very slightly puncturi'd. ( olor reil-brown, 

 darker ventrally and dorsally, nearly black on the thorax an<l cases, with a green tinge on the latter. Length, 

 13 mm. ; width, 4.5 mm. There are two broods each year. 



Food plant. — Willow (Salix). 



Ilah'itat. — Oregjn ami Washington west of the Ca.scade range and, probably, also western I'.ritisb Columbia. 

 I'ouud by Prof. O. B. Johuson at Seattle, Wash. Larva from Portland, Ureg. (Dyar.) 



Ichthyura albosigma (Pitch). 

 (PI. Ill, llgs. 27-30\ 



Clontera albosiijma Fitch, 2d Kep. Nox. Ins. N. Viuk. )>. 274, pi. 2, tig. 4, ISra; 5th liep. Nox. Ins. N. York, 



p. 64, 18,59. 

 lohthyiira alhosiijma Morris, Synopsis Lep. N. Amer., p. 244, ist)2. 



Pack., Proc. Ent. Soe. Phil., iii, p. 3.52, 1864. 



Grote, Check List N'. Amer. Moths, p. IS, 1882. 



Pack., 5th Kej). U. S. Knt. Com. Forest lus.. p. 4.54, 1890 (ligure of moth in text). 



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

 Melalopha allwHUjina (sic) Ivirby, Syn. Cat. Lep. Het., i, p. 610, 1892. 



var. upecijica, Dyar, Can. Ent.,xxiv, p. ISO, .Inly, 1892. 



Neura. and Dyar, Can. I'.nt.. xxv, p. 122. 1893; Trans. Amer. Eut. Soe., xxi. p. 191, 1894; 

 .lourn. X. V. Ent. Soe. p. 114. 1S94. 



Iiarva. 



(PI. XVL ligs. 3. 3o, 36. 4. 5.) 



Fitch, 2cl Rep. Nox. Ins., p. 274, 18.55 (egg, full-fed larva, cocoou); 5th liej). Nox. Ins. N. York. p. (l\. 18,59. 

 I'ackard, .Jour. N. York ICnt. ."^oc. i, p. 27, March. 1893 (three last stages descrilH'd). 



A[i>th. — Several S and 9 . Wiug.s less ocherinis tliaii in /. iiii-hisn. (|niti' clear, ;inil liatlicd witli 

 a slifjlit lilac tiii}>e. The dai-k brown tlioracic band is wider, inoie trianoiilar in liDnt tliaii in 

 /. iiiclusti and upkalis, extendinjj on the low thoracic tult as n broad coidate concolorous unirk. 

 Fore wings, with the basal and vseeond lines distinct and parallel, crossing; the entire wino-, the basal 

 line not beino- dislocated. The third line, reachinj;- only as far as the subcostal vein, slii;litly 

 bent, connected at its base with the lonrth line and forining a narrow obscurer V, very ditVerent in 

 shape from that of the other species. Tin; onter or tbnrth line, jjassing linward from the hinder 

 edge of the wing, cnrves outward on the fotirih subcostal venule, wiiere it becomes a wliite Vshajied 

 mark, the deep, large sinns being filled in with a large patidi of reildish Vandyke brown, the patch 

 being bounded behind by the cubical \('in. Fioui tliis .sinus the line ol)]it|neIy retreats to the 

 costa. jiftrr forndng a very distinct snbci)st;il loop. 15eyond the loops and sinus the wing is 

 brownish to the edge, including tlu^ ai)ical region. Discal s])ot forminu a faint line with a second 

 inner parallel one. An obsolete dark submarginal dilfiise line, paler within. Iliinl wings with 

 no line, quite i)ale. 



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

 broad costal whitish mark is quite distinct tlirough the wing: costa ferruginous. Tiie abdominal 

 tuft edged with dark brown, miudi ;is in the other siiecies. 



