THE BUFFEL-HEADED DTTCK. 337 



coverts drab-grey or ash-grey ; remaining under-parts white ; 

 a-xillaries, under wing-coverts and tail as male ; wing as male but 

 wing-coverts black-brown, middle greater coverts in some with a 

 spot of white on outer web or with both webs more or less white 

 tipped black-brown, in others uniform black-brown. Very little 

 moulting material examined. 



Adult female. Eclipse. — (Not examined. ) 



Nestling. — Upper-parts, lores and crown to below eye dark 

 bistre -brown, whitish bar across wing and patch on side of back 

 and on side of rump ; rest of cheeks, sides of neck, chin and throat 

 white ; upper-breast, sides of body and under tail-coverts greyish- 

 brown or dusky-brown ; under-parts greyish -white. 



Juvenile. Male. — Apparently as adult female but larger and 

 white patch on head usually larger. Female. — Apparently as adult 



a 



The Buffel-headed Duck. Adult female. 



female, but white patch on sides of face smaller. Hardly any 

 juveniles examined. 



First winter and summer. Male. — Apparently assumes only a 

 certain amount of adult plumage. One (March 31st, Tring Mus.) 

 has white patch on head as in juvenile ; some new blackish feathers 

 on sides of neck and on crown and cheeks where they are glossed 

 reddish -violet at tip ; nape intermixed with new white feathers ; 

 a few new black feathers on mantle ; lower-neck and upper-breast 

 white and some new white feathers on sides of body and flanks. 

 As in B. c. clangula there appears to be a partial first winter plumage; 

 head and neck as in juvenile ; some scapulars dark ash-grey with 

 ash-white centres ; upper tail-coverts ash-grey ; new feathers of 

 sides of body and flanks pale ash-grey, upper-breast intermixed 

 with new white feathers ; rest of plumage as juvenile in coloration 

 but mantle and scapular feathers apparently freshly moulted in. 

 Very little material examined. White feathers on nape, black 

 feathers on mantle and white flank-feathers described in March 

 bird are apparently only acquired by more advanced males. 

 vol. n s z 



