596 WILLIAM T. M. FORBES 



6. Terminal spots with black dots or short bars, longest in C. quin- 

 quareatus, which lias only a single silver streak and dark 

 brown ground. 

 7. A white costal streak, separated from the subcostal one by a 



fine brown line on R 3 3. agitatellus. 



7. White streak broad, divided by a broad brown ray in upper part 



of cell C. bidens var. 



7. White streak simple, leaving at least the costal edge brown. 

 8. A white or silver patch in middle of wing before the sub- 

 terminal line, below or beyond the tip of the streak. 

 9. Apex forming an angle of GO , the upper part of the outer 

 margin at an angle to the lower; inner margin white, 

 ground pale and streaked with lead color; brown ter- 

 minal line and white in base of fringe ending abruptly 

 at the angle of the outer margin; terminal dots marginal. 

 10. Inner margin pure silver white, with contrasting black 

 edge, outwardly; expanse 28 mm.; lines on veins all 



lead-gray 13. dceckellus. 



10. Inner margin powdery and less contrasting, lines on veins 

 a mixture of silver and blackish; expanse 22 mm. 



14. floridus. 



9. Apex more nearly a right angle, except in C. exsiccatus; 

 outer margin even, the blackish terminal line and white 

 base of fringe fading out gradually below. 

 10. Part of inner margin white, contrasting (sometimes only 

 a small spot in C. labradoriensi$, which is distinguish- 

 able by its very dark ground-color ) . 



11. Ground dark brown, normally with a diffuse silver 

 area on middle of inner margin, often cut in two by a 



blackish bar 5. labradoriensis. 



11. Ground bright yellow-brown, with a narrow silvery 



streak on inner margin 7. youngellus. 



10. Inner margin at most pale straw yellow, and in that case 

 shading into the darker yellow ground. .4. alboclavellus. 

 8. No such patch; ground continuous to subterminal line. 



9. A contrasting pale spot in middle of terminal space; tooth 

 on lower side of silver streak strong, and more than two- 

 thirds way out 6. bidens. 



9. A pale spot below apical dash only, obscure in C. lyorisellus; 

 tooth usually three-fifths way out, running into a slender 

 line or obsolescent. 

 10. Silver patch only covering a little of costal region (above 



R), toward base. 



11. Streak in cell as wide as costal brown area; terminal 

 dots in the form of short bars, reaching the terminal 



line ; grayish 15. hamellus. 



11. Streak in cell, beyond the tooth, twice as broad as the 

 dark costal stripe; ground brown; terminal dots 

 short and independent of the terminal line. 



8. prcefectellus. 

 10. Silver stripe broader, toward the base covering all but 



the costal edge, and covering R to end of cell. 

 11. Ground cream and yellow; silver streak lying along 



costa three-fifths way to apex 16. lyonsellus. 



11. Ground dark brown; streak gradually diverging from 

 costa. 



