CLEAR-WING MOTHS OF FAMILY AEGERIIDAE 179 



Female. — Thorax brown-black, marked with yellow like the male, with 

 the thin vertical stripe on the tegula not always extending beyond the 

 prothorax ; two yellow patches on each side posteriorly are separated by 

 a transverse black area. Abdomen mostly black, segment 1 entirely black ; 

 segment 2 black with a narrow anterior yellow edge, broadening at the 

 sides and beneath ; segment 3 black with a broader anterior yellow edge ; 

 segment 4 black, touched with yellow only at the sides and beneath; 

 segments 5 and 6 yellow, each with posterior half black, the black band 

 narrowing laterad ; last segment entirely yellow, its tip shaded with pale 

 brown. Otherwise like the male. 



Distribution. — Adirondack Mountains, N. Y., Michigan, Wisconsin, 

 Montana, Colorado, Utah, Washington. 



Ty/'^.— U.S.N. M. No. 56852. From Adirondack Mountains. 



Remarks. — The male and female types and allotype were collected in 

 copulation by Howard Natman in Keene Valley, Adirondacks, N. Y., 

 July 29, 1911. The male is not quite so dark as Beutenmiiller's illus- 

 tration of a male tibialis; the female, however, perfectly matches his 

 illustration of that sex. Field investigations still are insulTicient to ex- 

 plain the melanism that occurs in this species. The New England States, 

 which include the type locality, are least represented in available material. 

 Examples from the Great Lakes regions of Michigan and Wisconsin 

 average sufficiently dark to be placed with the variety mclanoformis. In 

 the West, dark-colored specimens occasionally may turn up in any series, 

 but oftener they occur in lots from high elevations or the northern coastal 

 regions. The series of the variety melanoformis studied includes, besides 

 the types : One female, North Fox Island, Leelanau County, Mich., 

 August 2, 1922 (S. Moore) ; one male, Beaver County, Utah, 8,000 feet, 

 July 10, 1914 (Engelhardt) ; one female. Grand Park Creek, Colo., 10,000 

 feet on aspen, July 25. 1922 (Engelhardt) ; one male and one female, 

 Missoula, Mont., reared from cottonwood, June 17, 1915 (J. Brunner) ; 

 one female, Spanaway, Pierce County, Wash., July 27, 1935 (William H. 

 Baker). 



AEGERIA TIBIALIS variety PACIFICA (Hy. Edwards) 



Plate 30, Figures 175, 176 



Trochilimn pacifiaim Hy. Edwards, Papilio, vol. 1, p. 180, 1881.— Beutenmuller, 



Bull. Amer. Mus. Nat. Hist., vol. 4, p. 171, 1892; vol. 6, p. 365, 1894; vol. 8, 



p. 118, 1896; vol. 9, p. 218, 1897; vol. 12, p. 159, 1899. 

 Trochilium caliiornicum Neumoegen, Ent. News, vol. 2, p. 108, 1891. 

 Trochilium minimum Neumoegen, Ent. News, vol. 2, p. 108, 1891. 

 Aegeria tibialis var. dyari Cockerell, Can. Ent., vol. 40, p. 330, 1908. 

 Aegeria tibialis var. anonyma Strand, Lepidopterorum catalogus, pt. 31, Aegeriidae, 



p. 124, 1925. 

 Aegeria pacifica McDunnough, Check list of the Lepidoptera of Canada and the 



United States of America, pt. 2, No. 8689, 1939. 



