150 NocruiD.K. 



yollowisli white faintly tinged with red-brown, a faint curved post- 

 medial line. 



Ab, 1. Paler and less red. — Manitoba, Alberta. 



Hub. Canvda, ]{eiifrew Co., 7 St Manitoba, Winnipeg, 2 c? , 

 Alberta, Calgary ( \Vullei/-Dud), 1 d" , 4 $ ; U.S.A., Massachusetts, 

 JSew York, Evans Center, 2 cJ type, New Jersey, Utah, Colorado. 

 Ri'j). 24-40 millim. 



Larva. Dvur, Pr. U.S. 'Sat. Mus. xxvii. p. 874 (1904). 



Head rounded, disk-like, yellowish white, white on face which is 

 edged by a heavy semicircular black band, jaws and sutures of 

 mouth Idaek ; body tlattened ventrally, somite 12 not enlarged; 

 trauslucfut green ; abroad dorsal white band on somites 3 to 1!3, 

 narrowing in front; thoracic shield green, not cornilied ; narrow 

 subdorsal and substigmatal white lines ; legs tipped with black ; 

 tubercles small, pale, white with dark hair point-*, iv. at the lower 

 corner of spiracles which are Avhite edged with black ; skin 

 shagreened. Food-plant: Aspen, living in a dwelling formed of 

 the loaves with a hole at the lower end. 



4493. Ipimorplia subvexa. (Plate CXLI. fig. 8.) 



Ipimorpha subvexa, Grote, Can. Ent. viii. p. 189 (1876); Smith, Cat. Noct. 

 N. Am. p. •212. 



(5 . Head, thorax, and abdomen reddish brown mixed with grey ; 

 antennae with the basal joint white, the shaft ringed with whitish; 

 l)cctus mixed with whitish ; abdomen with the anal tuft tinged 

 with rufous, the ventral surfece whitish. Fore wing grey thickly 

 irrorated with olive-])rown ; subbasal line Avhitish, slightly angled 

 inwards on median ncrvure and ending at submedian fold; ante- 

 medial line brown defined by pale yellow on inner side, oblique and 

 slightly excurved at median nervuro ; claviform very small, brown 

 slightly defined by whitish; orbicular and reuiform brown defined 

 by whitish, the former small, elliptical, the latter large and con- 

 stricted at middle ; a slight brown medial shade from lower angle 

 of cell to inner margin ; postmedial line brown defined by jiale 

 yellow on outer side, obliquely curved from costa to discal fold, tlien 

 straight, oblique ; subterminal line indistinct, whitish, defined on 

 inner side by olive-brown suffusion, excurved below vein 7 and at 

 middle, angled inwards at discal and submedian folds and bent 

 outwards to tornus ; a terminal series of small brown lunules ; 

 cilia brown with slight pale line at base and whitish tips. Hind 

 wing whitish suffused with brown except on costal area ; cilia 

 ochreous white with a brown line through them ; the underside 

 ochreous white, the costal area irrorated with brown, a brown 

 postmedial line from costa to discal fold. 



Boh. U.S.A., Texas {Bdfrage), 1 S type, Colorado. Exp. 

 42 millim. 



