782 
U. S, P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT, 
Female with the wing-similar, but with the blue of coverts and scapulars less distinct Head and neck brownish yellow, 
spotted with dusky ; the belly with a decided chestnut tinge. 
Length, 20.00 ; wing, 9.50 ; tarsus, 1.38 ; commissure, 3.02. 
Hub .—Continent of North America ; abundant in Europe. 
List of specimens. 
Catal. 
No. 
Sex. 
Locality. 
When collect¬ 
ed. 
Whence obtained. 
Orig’l 
No. 
Collected by— 
Extent. 
Stretch 
of wing. 
Wing. 
Remarks. 
925 
8 
S. F. Baird. 
20.00 
32.25 
9.50 
2524 
Q 
Oct. 18,1846 
20.25 
31.75 
9.50 
5452 
9760 
8 
Ayoway river, Neb. 
May 5,1856 
Lt. Warren. 
Dr. Hayden_ 
20.25 
33.25 
9.75 
Eyes yellow..,. 
5124 
8 
Dec. 1,1855 
169 
21.00 
32.00 
10.0(1 
low, feet and gums dark. 
4138 
Q 
4908 
8 
Mar. 20,1856 
20.00 
33.00 
9.75 
9759 
8 
9755 
Jan. —,1558 
8 
Jan. 16,1856 
CHAULELASMUS, Gray. 
Chauliodus, Sw. F. Bor. Am. 1831. Not of Bloch, 1801. 
Chauliodes, Eyton, Mon. Anat. 1838. Not of Latreille, 1798. 
Chaulelasmus, G. R. Gray, 1838. Type .flnas strepera, L. 
The characters of this genus have been sufficiently indicated in the synopsis, on page U2. 
The diagnosis of the single species is as follows : 
Head spotted ; lower throat, jugulum, hack, and sides of body banded black and white ; rump 
and tail coverts black ; middle wing coverts chestnut, succeeded by black internally ; speculum 
white, bordered externally by black. C. streperus. 
CHAULELASMUS STEEPEEUS, Gray. 
Gadwall; Grey Duck. 
Anas strepera,' Linn. Syst. Nat., 1,1766,200.— Gmelin, I, 520.— Lath., Ind. II, 1790, 849.— Wilson, Am. Orn. 
VIII, 1814, 120 ; pi. Ixxi.— Bon. Obs. 1825, No. 257.— Aud. Orn. Biog. IV, 1838, 353 ; pi. 348.— 
Ib. Syn. 378 .—Ib. Birds Amer. VI, 1843,254; pi. 388.— Temminck, Man. 11,838. (European.) 
Anas (Chauliodus) strepera, Swainson, F. Bor. Am. II, 1831, 440. 
Anas (Boschas) strepera, Nutt. Man. II, 1834, 383. 
Ktinorhynchus strepera, Eyton, Mon. Anat. 1838, 137. 
Gadwall, or Gray, Pennant, II, 575.— Latham. 
“Chaulelasmus streperus, Gray, 1838.” Gray. 
Sp. Ch.— Male. Head and neck brownish white, each feather spotted with dusky; the top of head tinged with reddish. 
Lower part of neck, with fore part of breast and back, blackish, with concentric narrow bars of white, giving a scaled appearance 
to the feathers. Interscapular region, outermost scapulars, and sides of the body finely waved transversely with black and 
white. Middle wing coverts chestnut, the greater velvet black, succeeded by a pure white speculum, bordered externally by 
hoary gray, succeeded by black ; crissum and upper tail coverts black. Longest tertials hoary plumbeous gray. Innermost 
scapulars with a reddish tinge. Inside of wing and axillars pure white. Bill black. 
Female with the bill dusky, edged with reddish. Wing somewhat like that of the male, but with the chestnut red more restricted. 
Length, 22 ; wing, 10.50; tarsus, 1.64 ; commissure, 2,04. 
Ilab .—Norih America generally, and Europe. 
