92 NORTH AMERICAN BIRDS. 



markings ; lower basal angle of upper mandible with 

 a triangular black spot ; speculum usually bluish 

 green; about the size of A. obscura. Eggs 2.15 X 1-61, 

 pale dull buff or pale grayish buff. Sab. Southeastern 

 United States, from Florida to Kansas. 



134. A. fulvigula Kidgw. Florida Duck. 

 e 2 . Wing with one or more white bands. 



f 1 . Wing more than 8.75, with two white bands. 



Chin, throat, and lower part of cheeks plain buffy ; 

 dusky prevailing on upper parts, lower parts with 

 dusky and ochraceous in about equal proportion ; 

 wing 8.90-10.00, culmen 1.85-2.05, tarsus 1.60, 

 middle toe 1.95. Sab. Southern Mexico (Puebla, 

 etc.). 



A. diazi Eidgw. Mexican Duck. 1 

 P- Wing less than 8.75, with only one white band. 



Only the chin and upper part of throat unstreaked 

 buff; dusky and ochraceous markings nearly 

 equal in extent, the latter, however, rather pre- 

 dominating on lower parts ; speculum dark metal- 

 lic green, followed, successively, by a velvety black 

 subterminal and a pure white terminal bar, each 

 about .35 wide ; wing 8.50, culmen 1.65, tarsus 

 1.30, middle toe 1.70. Sab. Western Mexico 

 (vicinity of Mazatlan). 



A. aberti Ridotv. Abert's Duck. a 

 c 2 . Wing less than 8.00; scapulars and tertials lanceolate, and marked 

 with buffy or whitish median stripes in adult males. (Lesser wing- 

 coverts plain light bluish, last row of middle coverts white spotted 

 or blotched with dusky, speculum bronzy greenish.) (Subgenus 

 Querquedula Stephens.) 

 d 1 . Culmen usually less than 1.65. Adult male: Head and neck dull 

 plumbeous, with a large crescent-shaped patch of white in 

 front of eye, faint gloss of metallic lavender-purple on sides of 

 occiput, the crown dusky ; lower parts pale chestnut, spotted 

 1 with black. Adult female (and adult male in breeding season) : 



Above dusky, varied with dull buffy ; head, neck, and lower 

 parts dull brownish white, or pale dull buff, the head and neck 

 streaked with dusky (except on chin and upper throat), the 

 lower parts more or less spotted with same, the belly sometimes 

 (especially in younger birds) immaculate. Young: Similar to 

 adult female, but whole belly immaculate, and speculum dull 

 grayish brown, without metallic gloss. Length 14.50-16.00, wing 



1 Anas diazi RiBHW., Auk, iii. July, 1886, 332. 



» Anas aberti Ridgw., Proo. TJ. S. Nat. Mus. 1. 1878, 250. 



