416 Dr. A. Hall on the Mammals and Birds 



with green ; small wing coverts pale blue ; speculum brilliant 

 grass green, bounded above and below with white ; rump brown- 

 ish black, tinted with sea green ; tail coverts sea green ; tail cu- 

 neiform ; the four central feathers umber brown, all the others 

 white, more or less spotted with brown ; primaries umber brown, 

 their shafts white. 



Ventral aspect. Chin and upper half of throat umber brown ; 

 breast and wing linings white ; belly, vent, and sides chesnut ; 

 flanks chesnut, finely undulated with dark brown ; tail coverts 

 black with a sea green iridescence. 



2nd primary longest, Istsubequal to 2nd, the others graduated; 

 leno-th 20 inches ; alar expanse 35 inches ; length of bill from 

 the frontal feathers 2f inches. The female is liver brown above, 

 with broad borders of pale wood-brown — beneath, pale wood- 

 brown with obscure livid brown marks ; the lesser wing coverts 

 are slightly glossed with pale blue, and the speculum is less vivid 

 than in the male. 



A. strepera. The Gadwell. 

 Chaulelasmus streperus. Baird ! 



D.c. " Speculum white bordered with black and chestnut ; feet 

 *' orange ; their webs blackish ; tail of 16 feathers ; male blackish, 

 *'■ waved with white ; rump black. Female duller and rump uni- 

 " form in colour with the rest of the plumage." 



Length 23 inches ; do of bill 1 inch 7 lines. I have no doubt 

 that this species is to be met with in this District, but it has as 

 yet escaped my notice. 



A. ohscura. Dusky duck — Black duck. 

 A. ohscura. Baird ! 



v.s.p. Bill livid, its nail black ; legs and feet yellowish ; 

 irides hazel ; eggs 8 to 15, white. 



Dorsal aspect. Crown of head blackish brown ; frontlet streak- 

 ed with drab ; cheeks and sides of the neck drab, streaked with 

 blackish brown ; interscapulary region, rump, scapulars, and lower 

 wing coverts umber brown, margined with pale chesnut ; tail co- 

 verts black, margined with pale chesnut ; tail cuneiform, blackish 

 brown edged with brownish white ; primaries dusky ; speculum 

 purplish green, bordered above and below with jet black, the 

 lower border terminated by white. 



Ventral aspect. Chin and throat drab, streaked with blackish 

 brown ; the remaining parts of this aspect umber brown, streaked 



