782 



U. S. p. K. R. EXP. AND SURVEYS — ZOOLOGY — GENERAL REPORT. 



Female with the wing similar, but witli tlie 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. 

 IJab. — Continent of North America ; abundant in Europe. 



List of sjoecimens. 



CHAULELASMUS, Gray. 



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

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

 Chaulelasmus, G. R. Gray, 1838. Type .Inas sirepera, L. 



The characters of this genus have heen sufficiently indicated in the synopsis, on page *I*J2. 

 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 G. sireperus. 



CHAULELASMUS STREPERUS, Gray. 



Gadwall ; Grey Duck. 



^nas strepera, Ltna. Syst. Nat., 1, ]7C(), 200.— Gmelin, I, 520.— Lath., Ind. II, 1790, 849.— Wilson, Am. Cm. 

 VIII, 1814, 120 -, pi. lx.\i.— Bon. Obs. 1825, No. 2,37.— Aud. Orn. Biog. IV, 1838, 3.53 ; pi. 348.— 

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



JJnas {Ckauliodus) sirepera, Swainson, K. Bor. Am. U, 1831, 440. 



^nas {Bosclias) sirepera, Nutt. Man. II, 1834, 383. 



Klinorhynchus sirepera, Eyton, Mon, Anat. 1838, 137. 



Gadu-all, or Gray, Pennant, II, 575. — Latham. 



"Chaulelasmus sireperus. Gray, 1838." Gray. 



Sp. Cii. — Mule. Head and neck brownisli white, each feather spotted with dusky ; tho t'lp 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 tho body finely waved transversely with black and 

 white. Middle wing coverts chestnut, tho greater velvet black, succeeded by a ]>ure white speculum, bordered externally by 

 hoary gray, Bucceedod by black ; crissum and upper tail coverts black. Longest tertials hoary plumbouus gray. Innermost 

 scapulars with a reddish tinge. Insiiie of wing and axillars pure v. bite. Bill black. 



Female with tho bill dusky, edged with rcrhlish. Wing somewhat like that of the male, but with tho chestnut red more restricted. 



Lcn|^th,22; wing, 10.50; tarsus, I.G4; commissure, 2.04. 



Ilab. — Norih America generally, and Europe. 



