320 Field Museum of Natural History — Zoology, Vol. IX. 



Female. 



Mallard Duck. 



Male. 



Genus ANAS Linn. 



40. Anas platyrhynchos Linn. 

 Mallard Duck. 



Anas bosckas Linn., A. O. U. Check List, 1895, p. 48. 

 Distr.: Northern hemisphere, breeding nearly throughout the tem- 

 perate zone; south in winter to Cuba, Lower CaHfornia, Mexico, and 

 Central America to Panama. 



Adult male: Head and neck, dark green, 

 with a white ring on the neck; under parts, 

 whitish or ashy white; breast, rich chestnut 

 brown; under tail coverts, black; upper tail 

 coverts are also black with central feathers 

 elongated and curved upwards; speculum, 

 purple, bordered with black and white; feet, 

 orange red; bill, yellowish olive. 



Adult female: Speculum, purple, bordered with black and white; 

 head, brownish buff; belly, buffy brown, usually mottled; feet, 

 orange red. 



