440 NORTHERN ZOOLOGY. 



back, interior scapulars, and primaries, umber-brown ; sides of the head, the neck, and crest, 

 glossed with duck-green : rump and tail coverts, above and below *, with blackish-green. 

 Lower half of the neck, the breast, shoulders, shorter scapulars, ends of the greater coverts, and 

 sides of the rump, white ; longer scapulars, striped with berlin-blue, white and blackish-brown. 

 Lesser coverts berlin-blue. Speculum brilliant grass-green, broadly bordered above and 

 narrowly edged below with white ; bounded interiorly with greenish-black. Belly and flanks 

 deep orange-brown, the latter undulated posteriorly with black. Bill black. Legs orange. 



Form. — Bill a little higher than wide at the base, much depressed, dilated and rounded at 

 the end. Mandibles furnished with long slender crowded laminae, the upper ones acute 

 and projecting, forming an apparatus admirably fitted for sifting small insects from the 

 water. Surface of the upper mandible pitted near its oblong unguis. Wings scarcely 

 an inch shorter than the tail, which is graduated, moderately acute, and consists of fourteen 

 acute feathers. Tarsus scarcely compressed. Hind toe not lobed, and the outer toe shorter 

 than the middle one, as in the rest of the Anatince. 



The female is liver-brown above, with broad borders of pale wood-brown ; underneath pale 

 wood-brown with obscure liver-brown marks. She wants the dark-brown and green colours 

 of the head, rump, and tail coverts, the white of the neck, breast, sides of the rump, and 

 scapulars, and also the orange-brown of the belly. The lesser coverts are slightly glossed 

 with berlin-blue, and the speculum is less vivid than in the male. 



Dimensions. 



Inch. Lin. Inch. Lin. Inch. Lin. 



Length, total 21 6 Length of bill above . .2 4^ Length of middle toe . 1 9 



„ of tail . . .40 „ of bill to rictus 2 10 „ of its nail ... 4$ 



„ of folded wing .96 „ of tarsus ..15 



— R. 



[198.] 2. Anas (Chauliodus) strepera. (Swains.) The Gadwall. 



Genus, Anas, Linn. Swains. Sub-genus Chauliodus-)-, Swainson. 

 The Gadwall {Anas strepera). Wils., viii., p. 120, pi. 61, f. 1. 

 Canard chipeau ou Ridenne {Anas strepera). Temji., ii., p. 837. 

 Anas strepera. Bonap. Syn., No. 324. 



DESCRIPTION 



Of a male, killed on the Saskatchewan, May 22, 1827- 



Colour. — Top of the head and nape liver-brown edged with grey ; head beneath and neck 

 grey with small brown specks. Base of the neck above and below, anterior part of the back, 

 exterior scapulars, flanks, and sides of the vent, clove-brown, marked with concentric horse- 

 shoe shaped white lines. Interior scapulars, lesser coverts, primaries, tertiaries, and tail, hair- 

 brown ; intermediate coverts, chestnut-brown ; greater coverts, rump, and upper and under 



* The vent and part or whole of the under tail coverts in all the American species of the genera Anas and Mareca 

 are black. — R. 



■f Th. XavXiiiou;, exsertos denies habens. 



