TRIFID^. 9« 



is merely a slight variety, it exteads through Canada and the 

 northern and eastern United States. 



17. N. umbrosa, Ruh. — Expanse 1^ inch. Fore wings 

 rather oblong ; purplish-brown with distinct, slender, darker 

 transverse lines, and the nervures distinctly dark-brown; 

 hind wings whitish, broadly margined with greyish-brown. 



Antennae of the male notched and very faintly pectinated 

 with minute tufts of bristles arising from the notches, light- 

 brown; palpi densely tufted, deep chocolate-brown at the 

 sides, paler in front, apical joint very short ; head and thorax 

 rather pale umbreous with a decided purplish tinge ; collar 

 faintly barred with darker brown; scales at the back very 

 slightly drawn together to a hardly perceptible crest ; fascicles 

 dusky white ; abdomen pale reddish-brown, basal portion 

 abundantly clothed with long reddish-white scales ; lateral 

 and anal tufts pale purplish. Fore wings oblong, rather 

 broadened behind ; costa very slightly rounded ; apex bluntly 

 angulated ; hind margin almost perpendicular but very slightly 

 rounded — more so toward the anal angle ; dorsal margin 

 almost straight or very faintly hollowed ; colour pale purplish- 

 umbreous ; basal line abbreviated to a dark brown streak from 

 the costa ; first line distinct, slender, indented, dark brown ; 

 second line curved but not widely so, slender, single, distinct, 

 dark brown ; subterminal line hardly perceptible, yet forming 

 a sharp boundary between an inner dark smoky-brown, 

 indented and clouded transverse stripe, and an outer, paler 

 smoky-brown marginal stripe ; nervures distinctly dark 

 brown throughout ; orbicular stigma round, distinct, rather 

 paler than the ground colour, ringed with dark brown ; 

 reniform stigma distinctly edged on both sides with dark 

 brown, its inner edge obscured by a rather conspicuous, 

 smoky-brown, cloudy central shade, which is once angulated, 

 but completely crosses the wing ; cilia concolorous. Hind 

 wings smoky-white, more whitish toward the base, greyish- 

 brown toward the hind margin, sometimes forming there a 



