522 APPENDIX. 
on the throat and forehead; rest of the neck, with 
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 
latter, formed by the larger portion of the seconda- 
ries and the tips of its coverts; legs reddish-orange. 
Length twenty inches; wing nine inches. Female 
head and upper 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. 
DirPEr. 
Butter Ball, Buffel-Headed Duck, Spirit Duck. 
Fuligula Albeola, 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. Adult 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, witha band of white on the sides 
