782 U. 8. 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. 
Hab.—Continent of North America ; abundant in Europe. 
List of specimens. 
] 
Catal.| Sex. Locality. When collect-| Whence obtained. Orig’]| Collected by— | Extent. Stretch | Wing. Remarks. 
No. | ed. | No. of wing. 
eer Le 
95| 3 | Carlisle, Pa............| April 20,1840 | §. F. Baird ...... \Iseecs 20.00 32.25 | 9.50 
2524) O | Oct. 18,1846 |......d0....0. 20.25 | 31.75 9.50 |.. stejee sieie's 
5452 fol | Ayoway river, Neb.....| May 5,1856 Lt. Warren.. 20.25 | 33.25 9.75 | Eyes yellow.. 
9760) |< ss | Mimbres to Rio Grande.}.ceeee sees eees | Dr. Henry...... [eeeeee eee eeeee cece eeee lecneceee tees eees seceteee | teeeseccnn sees cesses seeese 
5124 3 | Dona Afia, N. M,..... 21.00 32.00 |} 10,00 | Bill light brown, iris yel- 
| low, feet and gums dark. 
4138 ie) New, Leon, Mexico ....| 00. .ccceceess| Lt. COUCH. ...05-leccess|eovane Cocee cee leeeecece ettereferseye| lcrreters'ete Bill brown, feet yellow... 
4908 | @ | San Diego, Cal......... Blk essen sesceesee.| 20.00 | 33.00] 9.75 | Iris light yellow....:e+e0e 
4455 [eevee San José, Cal...... 000. a [esceccccccece oes 
9759 | o Big Lagoon of desert .. ..| Dr. Heermann. 
75S |eeeeee | Bodega, Cal........... | Jan. —,1558 Lt. Trowbridge..|......| T. A. Szabo.... 
4525 | @ | San Francisco .....+... Jans 1651656||pDraSuckley ssnws|ecssee|veccesuesateeers 
| 
CHAULELASMUS, Gray. 
Chauliodus, Sw. F. Bor. Am. 1831. Not of Bloch, 1801. 
Chauliodes, Eyron, Mon. Anat. 1838. Not of Latreille, 1798. 
Chaulelasmus, G. R. Gray, 1838. Type Anas strepera, L. 
The characters of this genus have been sufficiently indicated in the synopsis, on page 772. 
The diagnosis of the single species is as follows: 
Head spotted ; lower throat, jugulum, back, and sides of body banded black and white ; rump 
and tail coverts black ; middle wing coverts chestnut, succeeded by black internally ; speculum 
winitebordered externally, by: DUCK .cc.caccesasetorrsaceraccsscsstnacesetcnnorcssoescersresccsnse Oris ie pentge 
CHAULELASMUS STREPERUS, Gray. 
Gadwall; Grey Duck. 
Anas strepera, Linn. Syst. Nat., I, 1766, 200.—Gmetin, I, 520.--Larn., Ind. I, 1790, 849.—Witson, Am. Orn. 
VIII, 1814, 120; pl. Ixxi.i—Bon. Obs. 1825, No. 257.—Aup. Orn. Biog. IV, 1838, 353 ; pl. 348.— 
Is. Syn. 378.—Is. Birds Amer. VI, 1843, 254; pl. 388.—Trmminck, Man. I, 838. (European.) 
“Anas (Chauliodus) strepera, Swainson, F. Bor. Am. I, 1831, 440. 
“nas (Boschas) strepera, Nutr. Man. II, 1834, 383. 
Ktinorhynchus strepera, Eyron, Mon, Anat. 1838, 137. 
Gadwall, or Gray, Pennant, II, 575.—Laruam. 
‘*Chaulelasmus streperus, Gray, 1838.’? Gray. 
Sp. Cn.—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. 
Hab.—North America generally, and Europe. 
