782 
U. S, P. E. E. EXP. AND SUEVEYS — ZOOLOGY — GENERAL EEPOET. 
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. 
Hah. — Continent of North America ; abundant in Europe. 
List of specimens. 
Catal. 
No. 
Sex. 
Locality. 
When collect- 
ed. 
1 
Whence obtained. Orig'I 
1 
Collected by— 
Extent. 
Stretch 
of wing. 
Wing. 
Remarks. 
925 
2524 
5452 
9760 
5124 
4138 
49U8 
4455 
9759 
9755 
4525 
3 
Q 
3 
9 
3 
April 20,1840 
Oct. 1 8, 1846 
May 5,1856 
20.00 
20.25 
20.25 
32.25 
31 75 
33.25 
9.50 
9.50 
9.75 
.... ,i„ 1 
Dr. Hayden 
Mimbres to Rio Grande. 
Dona Ana, N. M 
Dec. 1,1855 
169 
21.00 
32.00 
10.00 
Bill light brown, iris yel- 
low, feet and gums dark. 
Bill brown, feet yellow. . . 
San Diego, Cal 
Mar. 20,1856 
20.00 
33.00 
9.75 
3 
Big Lagoon of desert . . 
Dr. Heermann. 
Jan. —,1558 
Lt. Trowbtidge.. 
3 
San Francisco ' 
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 Avas strepera, L. 
The characters of this genus have heen sufficiently indicated in the synopsis, on page 772. 
The diagnosis of the single species is as follows : 
Head spotted ; lower throat, jugulum, hack, and sides of hody handed black and white ; rump 
and tail coverts black ; middle wing coverts chestnut, succeeded by hlack internally ; speculum 
white, bordered externally by black G. slreperus. 
CHAULELASMUS STREPERUS, Gray. 
GadwaSl ; Grey Duck. 
Anas strepera, Linn. Syst. Nat., I, 17Gb', 200. — Gmelin, I, 520.— Lath., Ind . II, 1790, 849.— Wilson, Am . Ora. 
VIII, 1814, 120 ; P l. Ixxi.— Bon. Obs. 1825, No. 257.— Aud. Om. Biog. IV, 1838, 353 ; pi. 348.— 
Ib. Syn. 378.— Ib. Birds Amer. VI, 1843, 254 ; pl. 388 .— Temminck, Man. II, 838. (European.) 
Anas (Chauliodus) strepera, Swainson, F. Bor. Am. II, 1831, 440. 
Anas (Doschas) 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. 
Sr. CA.— 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 plumbeaus gray. Innermost 
scapulars with a reddish tinge. Inside of wing and axillars pure v»hite. 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. 
Hub. — Nonh America generally, and Europe. 
