178 MEMOIES OF THE NATIONAL ACADEMY OF SCIENCES. 



Pack., rroc. Eut. Hoc. I'hil., iii, p. 3r>8, 1804. 

 Grote, New Cheek List N. Amer. Jlotlis, p. 19, 1882. 

 Smith, List Lep. Bor. Amer., p. 30, 1891. 

 Kirl.y, Syu. Cat. Lep. Het., i, p. 572, 1892. 

 Si/mmerhta Neain. and Dyar, Trans. Amer. Eut. 8oc.. ssi. p. 1X7, June, 1894; .Journ. N. Y. Ent. Soc, ii, p. 114,. 

 Sept., 1894. 



Moth. — Vertex of the liead with two large tufts uniting and forming a large, higli, prouiiueut 

 vertical tuft just above the insertion of the auteuiue. The peetinatious of the S antemue are a little 

 louger than the Joints, becoming giadiially obsolete toward the ti[is; the pectiuations are densely 

 ciliated; in the 9 the antenuic are entirely simple and thread like. Eyes uaked. The palpi are 

 usually long and slender, extending a tiiird of their length bi^yond the front, and conniving at 

 their tips; third joint unusually long, equaling in breadth the width of the second joint. The 

 maxilla' are very short, not reaching out as far as the pal])i. The thorax is moderately robust, 

 and is not tufted. 



The fore wings are unusually broad and square at the apex, being about half as long as broad ;. 

 costa straight; the apex somewhat pointed and square; outer edge near the apex nearly straight, 

 thence gradually rounded to the internal edge, which is not tufted. Venation: Quite unlike that 

 of Dasylophia and Xotodonta; a small short subcostal cell, and a second, minute one beyond; the 

 fourth subcostal venule ends on the costa within the apex; the discal venules are situated well 

 beyond the middle of the wing, and the two together form a nearly straight line; the independent 

 vein ari.ses nearer the subcostal vein than usual. 



Hind wings longer than usual, the outer two thirds of the costa straight: the outer edge 

 regularly rounded, slightly bent in the middle. Venation: The subcostal vein divided about 

 halfway between the discal veins and the outer edge ; the independent vein (III.>) arises much nearer 

 the subcostal than usual, and the discal veins taken together form an obli(jue (not curved) line. 



Legs rather slender; femora and tibia/ pilose; the hind tibia- with long hair-like scales; the 

 tibial spurs rather stout, with the ends shar)) and uaked. 



Coloration: The species gray, with cross lines and the costal edge white. 



The genus may be recognized by the high conical vertical tuft on the head, by the unusually 

 long palpi, and by the straight co.stal edge and square apex of the fore wings, with their two 

 subcostal cells, and by the pecuhar style of cokuation. 



jjji/y, — " Subglobose, slightly concave at the base, smooth, shining." (Beutenmiiller.) 



Ijurea. — Body increasing in width from tiie prothoracic to the eighth abdominiil segment, the 

 head rounded, but slightly wider than the segment behind it. Skin smooth, shining ; richly and 

 conspicuously banded with yellow or reddish bands and black lines; on the eighth abdominal 

 segment a large, shiny, coral-reddi.sh huiup. Suraual plate distinct, crescent-shaped. 



Young larva. — Anal legs smaller than the other abdominal ones; body moderately thick; a 

 slight dorsal hump on the eighth segment, with minute, sliort, .slightly bulbous hairs; a lateral 

 dark brown line and a yellowish spiracular baud and a subdorsal dark line. 



Cocoon. — "Made a cocoon in a roll of paper" (Harris Corresp.). " Spins a thin, white web" 

 (Abbot and Smith): spins a thin, white web, through which the pupa can be seen. 



p„^,(,._The abdomen ends in a short, cremasteral sjiine, which is Hattened vertically, deejily 

 cleft, with tubercles, from which arise from three to four curved set;e on each side, the entire- 

 apparatus retaining a Hrm hold on the end of the mass of silk by which it adheres to the leaves. 



(ieiKjrapliical (Hxtributioii. — So far as known, the s])ecics found in the United States are 

 confined to the Appalachian and Austroriparian subprovinces of North America, extending from 

 Maine to Florida and thence westward to Texas. 



In Presidio,' Mexico, lives S. mandvla ( Edema manchla of 1 )ruce. Biol. Centr. Amer. Het.. i, p. 

 235, pi. 25, fig. 3), which in the shape of the fore wings is allied to »S'. albifrous, but differs 

 decidedly in the marking, not having the white costal region. 



' By Presidio we suppose is meant Presidio del Norte, which is in northern Mexico, on the southern bank of the 

 Eio Grande, just over the Texas border. This species should therefore be looked for in southwestern Texas and, 

 southern New Mexico. 



