782 



U. S, p. R. E. 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 du.^ky ; the belly with a decided chestnut linge. 

 Length, 20.00 ; wing, 9..")(l ; tarsus, 1.38 ; commissure, 3.02. 

 Uai. — Continent of North .'Imerica ; abundant in Europe. 



List of specimens. 



CHAULELASMUS, Gray. 



CftauKorfus, Sw. F. Bor. Am. 1831. Not of Bloch, 1801. 

 Chauliodes, Eyton, Mon. Anat. 1838. Not of Latreille, 1798. 

 Chnulelasmus, G. R. Gray, 1838. Type Anas strcpera, L. 



The characters of this genus have been sufficiently indicated in the synopsis, on page 772. 

 The diagncsis 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 

 white, bordered externally by black G. streperus. 



CHAULELASMUS STEEPERUS, Gray. 



Gadwall ; Grey Duck. 



Jlnas sircpera, Linn. Syst. Nat., I, 1766, 200.— Gmelin, I, 520.— Lath., Ind. II, 1790, 849.— Wilson, Am. Om. 

 VIII, 1814, 120 ; pi. Ixxi.— BoN. Obs. 1825, No. 257.— Aud. Cm. Biog. IV, 1838, 353 ; pi. 348.— 

 Ib. Syn. 378.— Ib. Birds Amer. VI, 1843, 254 ; pi. 388.— Temminck, Man. II, 838. (European.) 



Jlnas {Cliauliodus) strepera, Swainson, F. Bor. Am. II, 1831, 440. 



^nas (Boschas) strepera, Nnxx. Man. II, 1834, 383. 



Ktinorhynclius strepera, Etton, Mon. Anat. 1838, 137. 



Gadwall, or Gray, Pennant, II, 575. — Latham. 



"Chaulclasmus streperus, Gray, 1838." Gray. 



Sp. Cii. — Mule. Herd 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 bo'dy finely waved transversely with black and 

 white. Middle wing coverta chestnut, tho 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 plumbe»us gray. Innermost 

 scapulars with a reddish tinge. Inside of wing and a.\illars pure v.hitc. Bill black. 



Female with the bill dusky, edged with reddish. Wing somewhat like that of the mule, but with the chestnut red more restricted. 



Length, 22 ; wing, 10.50; tarsus, 1.64 ; commissure, 2 04. 



Hab. — Norih America generally, and Europe. 



