86. 
11. 
a7. 
ANATIDA—ANATINA: RIVER DUCKS. 693 
black stripes. Tail-feathers gray, the long central ones blackish ; sides and roots of tail varied 
with blackish and buff. It is thus a very handsome duck in full plumage, aside from the trim 
and clipper-like build. Length very variable, up to 30 inches, according to development of 
tail, which is sometimes 9 inches long, usually 5 or 6; extent 36.00; wing 11.00; bill 2.25; 
tarsus 1.67; middle toe and claw 2.25. Adult 9: Smaller; lacking the development of the 
tail; length 24 or less. Only traces of the speculum. in green specks in a brown area between 
white or whitish tips of the secondaries and those of the greater coverts. Bill blackish; feet 
dull grayish-blue ; iris brown. Whole head finely speckled, and whole neck finely streaked, 
with dusky-brown and grayish-brown or yellowish-brown ; under parts pale ochrey-brown, 
freckled with dusky ; upper parts variegated with brownish-black and yellowish-brown, on the 
fore parts the lighter color in angular or rounded bars on each feather. Young drake like the 
duck. Though the resemblance is close to some other species, observe color of bill and feet, tips of 
secondaries and greater coverts, and size and generic characters. Northern hemisphere; N. Am. 
at large, wintering and migrating in U.S. and beyond, breeding from northern borders northward ; 
more numerous in the interior than along either coast. I have found it breeding abundantly 
in parts of N. Dakota and Montana. Nest on ground; eggs 6-10-12, smooth, elongated 
ellipsoidal, 2.10 to 2.30 long by about 1.52; uniform dull grayish-olive, without any buff tint. 
CHAULELASMUS. (Gr. xatAuos, chaulios, protuberant ; edaopos, elasmos, a layer, plate ; 
referring to the teeth of the bill.) Gapwa.ts. Bill about as long as head, rather exceeding 
tarsus, the sides parallel to the rounded tip, the lamellz not concealed, the nostrils high up near 
the base, the reéntrance between the feathers on culmen and those on side of bill short and 
open, in advance of feathers on side of lower mandible. Wings pointed, lst primary longest. 
Tail short, rounded or cuneate, with. pointed feathers. ¢ with most of the plumage barred or 
half-ringed with black and white, or whitish ; middle wing-coverts chestnut, greater coverts 
black, speculum white ; Q with similar white speculum. Feet yellowish. 
C, stre’/perus. (Lat. streperus, noisy, ‘ obstreperous.’) GADWALL. GRAY Duck. Adult @: 
Bill blue-black; feet dull orange, with dusky webs and claws ; iris reddish-brown. Head and 
neck brownish-white, darker on crown and nape, barred and specked with dusky. Lower neck, 
breast, sides of body and fore-back waved with crescentie bars of blackish and white, the cres- 
centic marks giving a scaly appearance most distinet on the neck and breast, elsewhere finer, 
more undulatory and transverse. Lower back dusky, passing to black on the rump and tail- 
coverts. Belly white, minutely marbled with gray. Scapulars tinged with rusty brown ; longest 
inner quills hoary gray; lining of wings white; lesser upper coverts gray; middle coverts 
chestnut-red ; speculum white, formed by part or the whole of the outer webs of the second- 
aries, framed in velvet black of the greater coverts, terminally bordered with black and hoary 
gray. Length about 22 inches; extent 34.00; wing 10.50-11.00; tail 4.50; tarsus 1.60; Dill 
1.75; middle toe and claw 2.20. Adult Q: Smaller than g. Bill dusky, blotched with 
orange. Feet dingy yellowish, with dusky webs and claws. Lacking the regular crescentic 
and wavy markings of the ¢; variegated with dusky and tawny brown, like 92 of other 
species ; the chestnut of the g wanting or restricted ; but the wing-markings are sufficiently 
distinctive. Young drake resembling the 9. One of the most widely diffused of ducks, in 
most parts of the world; in N. Am. nearly throughout, but not specially aretic in the breeding 
season, nesting anywhere in the U. 8S. Nest on ground, sometimes in trees ; eggs creamy-buff, 
a trifle over 2.00 by about 1.50. 
MARE'CA. (S. Am. mareca, Brazilian name of a kind of teal.) Wuicron. Bill shorter 
than head, rather high and narrow at base, parallel-sided, with rounded end, the nail oceupy- 
ing the middle third; the upper lateral reéntrance short and open; nostrils high up and near 
base. Tail pointed, of 16 feathers, not half as long as wing. Bill and feet dark colored ; 
belly and middle and greater wing-coverts white; top of head white or light ; speculum green, 
black-bordered. 
