notodontidjE. 15s 



character to separate specimens from Canada and the 

 Hudson's Bay Territory, which, however, are known as 

 scptentrionalis, Walker. 



Genus 9. PETASIA. 



Antennae rather long, pectinated in the males, serrated in 

 the females ; fore wings elongated, having in the middle 

 of the dorsal margin a slightly projecting tuft of scales ; 

 a distinct black horny spur is conspicuous on the front of the 

 anterior legs. 



Larv^ cylindrical, very stout, holding both extremities 

 thrown up when at rest, \ 



PuP^ subterranean. 



LP. cassinea, Schiff. ; Aster oscopus sphinx, Staiid. 

 Cat. — Expanse 1^ to If inch. Fore wings greyish- white or 

 pale drab, with numerous short black longitudinal streaks ; 

 hind wings white, with grey dashes. 



Antennee rather more than one half as long as the fore 

 wings, in the male strongly pectinated throughout with solid 

 curved teeth, reddish-brown, back of the shaft white. Head, 

 with the palpi densely tufted with long projecting brownish 

 and whitish scales ; with white tufts at the bases of the 

 antennae. Thorax broad and squared, with extremely large 

 and long shoulder-lappets, which are white in the middle, 

 with a black streak on each side, and the front and hind 

 margins tinged with brown ; collar similarly brownish divided 

 by a white patch, edged with black ; remainder of the thorax 

 brownish. Abdomen rather tapering, densely covered with 

 pale brown scales; anal tuft divided, pale brown. Fore 

 wings rather triangular ; costa straight almost to the apex, 

 which is blunt ; hind margin gently rounded off to the dorsal 

 margin, which is straight. White, faintly tinged with brown 

 or grey, or both, in separate longitudinal shades ; no trace 

 of transverse lines, the only markings being longitudinal 



