MASKED DUCK 



wavy black bars. Bill and feet bluish gray, the 

 feet with blackish webs. 



Female. Region around base of bill white; 

 head, neck, chest and upper back dark brown; 

 wing patch white; sides grayish brown with 

 wavy white bars shading into the white abdo- 

 men. The dark color of the head, neck and 

 chest does not end abruptly as it does in the 

 male. Bill and feet duller. 



Young. Similar to female. 



A migrant. It was abundant on Gatun Lake 

 on November 16, 1911, according to Jewel. 

 Unlike the other ducks here recorded from the 

 Canal Zone, this species is an expert diver and 

 can get its food in comparatively deep water. 

 It is of stout build, the head and bill rather large. 



10. Nomonyx dominicus (Linnaeus) 

 Masked Duck 



Length about 380 mm. (15.00 in.); tail about 

 102 mm. (4.00 in.). 



Male. Head black; entire neck and remain- 

 ing upper parts chestnut with heavy, solid, black 

 U-shaped markings on wing coverts and back; 

 quills black with a conspicuous patch of white; 

 tail black and graduated, the feathers narrow, 

 the tips pointed; chest rusty chestnut fading 

 to buffy grayish brown with indistinct black 

 markings on breast and abdomen. Bill black. 



Female. Above dark brown mottled with 

 buff on neck. Elsewhere feathers edged with 

 99 



