‘114 NORTH AMERICAN BIRDS. 
Genus NOMONYX Riveway. (Page 87, pl. XXVI., fig. 2.) 
Species. 
Adult male: Fore-part and top of head, black; rest of head, with neck, dark 
rusty cinnamon; back and sides rusty, striped with black; belly, ete. yellowish 
rusty, the feathers occasionally showing dusky centres; wings brown, with a con- 
spicuous white speculum on greater coverts. Immature (?) male: Top of head, two 
stripes on side of head, and general color of upper paris, dull black ; spaces between 
head-stripes, also cheeks and chin, dull white; neck and chest rusty chestnut, 
sometimes with a purplish tinge ; rest of lower parts dull ochraceous, the feathers 
with concealed dusky central spots; middle and greater wing-coverts, basal portion 
of secondaries, and whole of axillars, white; back and scapulars varied with bars 
and borders of rusty. Adult female: Similar to the preceding, but black less intense 
and more broken, the rusty paler (sométimes replaced by ochraceous) and spotted 
with black; belly dull ochraceous white, and wing-speculum smaller. Length 
about 12.00-14.50, wing about 5.50-5.75, tail 3.50-4.50, culmen 1.20-1.37. Hab. 
Tropical America in general, including the West Indies; accidental in the eastern 
United States (Lake Champlain, New York, and Lake Koshkonong, Wisconsin). 
125. N. dominicus (Linn.). Masked Duck. 
Genus CHEN Bor. (Page 87, pl. XXVIIL, figs. 1, 2.) 
Species. 
Common CHaracters.—Adult with whole head and at least part of the neck 
white! (in two of the three species the plumage entirely white, except quills, which 
are blackish); the bill dull purplish red (in life), with whitish nail, and feet pur- 
plish red. Young with head and neck grayish, the rest of the plumage either 
chiefly grayish brown or else striped with grayish on a whitish ground; bill and 
feet dusky. 
a’. Bill very robust, the commissure widely gaping, and enclosing a broad blackish 
space, extending from the corner of the mouth nearly to the tip of the bill; 
feathering at base of upper mandible, along each side, having a very convex 
outline; culmen 1.95 or more. 
b'. Plumage chiefly grayish brown, the rump (usually) and wing-coverts bluish 
gray. 
Adult: Head and part of neck, and sometimes rump and part of lower 
surface, white; greater wing-coverts and secondaries (including 
tertials) edged with white. Young: Similar to adult, but head and 
neck uniform deep grayish brown, only the chin being white. 
Length 26.50-30.00, wing 15.00-17.00, culmen 2.10-2.30, tarsus 3.00- 
1 In some specimens the head more or less stained with bright rusty, or orange-rufous, from contact with 
ferruginous matter, 
