102 NORTH AMERICAN BIRDS. 



b*. Culmen as long as middle toe, without claw, its greatest width not more 

 than one-third the length of the culmen ; the end much flattened, and 

 nail very slightly hooked. (Subgenus Aristonetta BAiBD. 1 ) 



Adult male : Head and neck reddish brown, the former blackish on top; 

 chest, upper back, lower rump, and upper and under tail-coverts, 

 black ; rest of plumage (except quills, etc.) white, the upper parts, 

 sides, flanks, and ventral region, finely waved or vermiculated with 

 dusky. Adult female: Head, neck, chest, and upper back, raw- 

 umber brown, the fore part of the head and fore-neck whitish ; 

 scapulars, sides, and flanks similar, but tips of the feathers vermicu- 

 lated with whitish. Length about 20.00-23.50, wing 8.75-9.25, 

 culmen 2.10-2.50, greatest depth of bill .75-.80. Eggs 2.48 X 1-76, 

 pale grayish drab or very pale grayish olive-green. Hab. Whole 

 of North America, breeding far northward. 



147. A. vallisneria (WiLs.). Canvas-back. 

 a 2 . Culmen as long as outer toe, with claw ; bill wider at end than at base ; head 



and neck black in adult males. (Subgenus Fuligula STEPHENS.) 

 6 1 . Speculum white, tipped with black. 



c 1 . Back and scapulars in adult male grayish white irregularly waved or 



zigzagged with black ; no pendent crest on occiput. 

 d 1 . Flanks immaculate white. 



e 1 . Six inner quills with a distinct white space on the inner web. 

 Adult male : Head, neck, and chest uniform black, the first 

 with a greenish gloss ; wing-coverts dusky, " grizzled" with 

 grayish white; bill (in life) pale grayish blue, or bluish 

 white, with black nail. Adult male at end of breeding sea- 

 son: "Plumage resembling that of the female, but the 

 brown on the head and neck is blackish brown, the back is 

 more barred with dirty white, the beak is lighter blue, and 

 the eyes richer yellow." (DRESSER.) Adult female: Head 

 and neck snuff-brown, the former white round base of bill ; 

 chest, ventral region, and lower tail-coverts pale grayish 

 brown, fading into white on belly, etc. ; sides and flanks 

 deeper brown ; upper parts nearly plain brownish dusky, 

 the wings much as in the male. Downy young : " Crown, 

 nape, and upper parts uniform dark olive-brown ; throat, 

 sides of the head, and fore part of the neck, yellowish 

 white ; a dull grayish band crosses the lower neck-, rest of 

 the under parts dull yellowish, the flanks grayish yellow." 

 (DRESSER.) Length 18.00-20.00. wing 8.25-8.50 (8.42), 

 culmen 1.95-2.05 (2.00), greatest width of bill .90-1.00 



l Aristonetta BAIRD, B. N. Am. 1858, 793. Type, Anas vallisneria WILS. This subgenus, which was unani- 

 mously accepted by the A. 0. U. Committee, was accidentally omitted from the Check List. 



