378 



Predominating color of primaries some pale, dull shade bordering on 



clay-color 31 



Primaries very dark with some whitish scales; abdomen with two 



heavy black dashes following pale terminal area of thorax alaskensis 



Western species. Primaries narrow, colors usually dull and contrasts 



slight. Expanse over 25 mm 32 



Western. Primaries normal, with blackish-brown irroration, more or 



less longitudinally streaked. Expanse under 25 mm gratiosus 



Eastern. Primaries normal, more or less tinged with brown shades 

 and sprinkled with dark brown scales. Triangle at base of cleft powdery 



dark brown, in sharp contrast with ground color cretidactyhis 



Spot before cleft small, sometimes preceded by some dark scales form- 

 ing a vague streak, and weakly connected to costal spot. Ground color 



of primaries even, scantily powdered with dark scales rileyi 



Spot usually forming a dark triangle reaching costa. Primaries usually 

 somewhat striate, due to pale veins. Dark powdering usually abund- 

 ant cineruceus 



Tarsi heavily annulate. Abdomen with two heavy black dashes above 



on first segment alaskensis 



Fore and mid tarsi with a dark annulus about the end of each joint, 

 broken on one side on the former. No heavy black dashes on first 



abdominal segment above gtittatus 



Fore and mid tarsi white, faintly banded on one side only in the darkest 



specmiens 



34 



Hind legs usually white, sometimes with faintly darker annuli. Tufts 



of mid tibiae moderate. Primaries evenly pale some mathewianus 



Hind legs with dark tenninal annuli on tibiae and tarsal joints. Tufts 

 of mid tibiae large and bushy. In pale specimens the primaries are 

 conspicuously lighter in costal portion eupatorii 



35. Costal half of primaries soft grayish to purplish, blending into ochreous 



of inner margin. Expanse over 25 mm haroni 



Not such species 36 



36. Greatest width of primaries about one sixth length. Longest fringes 

 of second lobe exceeding width of lobe. Mid tibiae with two weak 



tufts. Hind tarsi usually with a conspicuous dorsal crest monodactyhis 



Wings usually wider, with moderate fringes. Crest on hind tibiae 

 never present 37 



i7. Ground color snowy while. Mid tibiae without definite median tuft.... 3S 

 Creamy white or darker , 39 



38. With or without a rounded dark dot before base of cleft huinodnctylns 



Witli an oblique mark before cleft at least faintly indicated 



some 9 5 of fisliii 



39. Yellowish with contrasting dark secondaries to dull gray, the primaries 

 with a subcostal yellowish line terminating opposite base of cleft. Ex- 

 panse 17-20 mm some corvus 



Sulplnir \cllovv with dark secondaries; expanse 24 mm. or over 



