438 APPENDIX. 



Oil tlie throat and forehead ; rest of the neck, v, ith 

 the entire plumage, white ; sides of the rump and 

 vent dusky grey; tail greyish-brown ; back and 

 "wings brownish-black — a large patch of white on the 

 lattci-, formed by tlie larger portion of the seconda- 

 ries and the tips of its coverts ; legs reddish-orange. 

 Length twenty inches ; wing nine inches. Female 

 head and upjDer part of the neck dull brown ; wings 

 dusky ; lower parts white, as are six of the seconda- 

 ries and their coverts ; the tips of the latter dusky. 

 About three inches smaller than the male. 



DiPPEU. 



Butter Ball, Buffel-IIeaded Duck, Spirit Duck. 



Fuligula Alheola, Linn. 



Specific Character. — Bill blue, from the corner of 

 the mouth to the end about one inch and a half, the 

 sides rounded, narrowed towards the point ; head 

 thickly crested, a patch behind the eye and a band 

 on the wings white. Ad nit male with the plumage 

 of the head and neck thick, and long forehead; loral 

 space and hind neck rich glossy green, changing 

 into purple on the crown and sides of the head ; from 

 the eye backwards over the head a triangular patch 

 of white ; the entire breast and sides of the body 

 pure white ; abdomen dusky white ; tail rounded, 

 greyish-brown ; upper tail-coverts lighter ; under 

 tail-coverts soiled white ; back and wings black, with 

 a patch of white on the latter. Female upper plu- 

 mage sooty-brown, with a band of white on the sides 



