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



Speculum, bluish purple, edged 

 with white and black; greater 

 wing coverts, with broad band of 

 white; head, tawny brown, 

 streaked with dark brown; belly, 

 pale buff, mottled with brown; 

 feet, orange red; axillars, white 

 (female). Anas platyrhynchos. 



Mallard Duck. 

 See No. 40. 



Mallard Duck. 



Male. 



Speculum, purplish blue; no white band on greater wing coverts; 

 head and throat, streaked; throat, not buff; no black spot at base of 

 bill; feet, olive (sometimes red); axillars, white; Eastern North 

 America. Anas riibripes. 



Black Duck. Dusky Duck. 

 See No. 41. 



Subfamily FULIGULIN^. Bay and Sea Ducks. 



Ducks having flap or membraneous lobe 

 on hind toe; tarsus, scutellate (transverse 

 scales) in front. 



* GROUP 1. Wing, from 5 to 6.50 inches long. 



SECTION 1. Tail feathers, not stiff and pointed. 



Head, greenish purple, with white patch (male); head, grayish 

 brown, with white patch (female or immature); no dark stripes on 

 cheek; bill, less than three-fourths inch wide. Charitonetta albeola. 



Buffle-head Duck. Dipper Duck. 



See No. 58. 



SECTION 2. Tail feathers, stiff and pointed. 



No greenish or purple on head; throat, whitish; cheeks, white 

 or whitish; bill, broad, three-quarters inch or more wide. 



Erismatura jamaicensis. 

 Ruddy Duck. 



See No. 66. 



* For directions for measurement, see page 21. 



