THE BIRDS OF NORTHERN THAILAND 55 



In the field the drake is recognizable at a glance by its bright 

 reddish head and neck and its apparently white back. 



AYTHYA BAEKI (Radde) 



Eastern White-eyed Pochard 



Anas (FuUgula) Baeri Radde, Reisen im Siiden von Ost-Siberien, vol. 2, 1863, pp. 



376-378, pi. 15 (Middle Amur, southeastern Siberia). 

 Nyroca oaeri, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1936, pp. 75, 131 



(Chiang Mai, Ban Nong Khiat). 



The eastern white-eyed pochard occurs regularly in winter, at least 

 in Chiang Mai Province, but always in small numbers. I found it 

 comparatively common only at the woodland pond at Ban Pa Muat 

 (north of San Sai Luang), where it was present throughout the cold 

 weather of 1936-37, in company with other ducks. I have speci- 

 mens taken at Chiang Mai, March 3 and November 23, 1936, and one 

 taken at Ban Nong Khiat, below Chom Thong, December 19, 1935. 



A female had the irides dark brown; the bill slaty; the feet and 

 toes plumbeous, the joints slaty ; the claws slate. An immature male 

 had the irides pale gray; the feet plumbeous, with the webs and joints 

 black. 



I have never seen an adult male baeri in Thailand. If such a bird 

 should be shot, it may be recognized by its having the head and neck 

 greenish black, changing gradually to a ring of unglossed black at 

 the base of the neck ; a rather large, well-marked white chin spot ; the 

 breast and upper belly dark rufous and the remaining underparts 

 white ; the upperparts blackish brown ; a broad white wing band and 

 a brownish- white area near the tip of the opened wing; the underwing 

 largely white. 



Females and young males have a white chin, an indistinct patch of 

 dark rufous on the sides of the head at the base of the bill, and the rest 

 of the head and neck blackish brown, almost black on top of the head; 

 the upperparts blackish brown; the breast and upper belly dull ru- 

 fous (adults) or dark brown (immatures), somewhat mottled with 

 blackish, whitish, or light brown; the remaining underparts light 

 brown or sullied white ; the wing like that of the adult male, but the 

 light area near the tip less whitish, more brownish. 



AYTHYA NYROCA (Guldenstadt) 



Western White-eyed Pochard 



Anus nyroca. Guldenstadt, Nov. Comm. Acad. Sci. Imper. Petropol., vol. 14, pt. 1, 



1769, pp. 403-408 ("in regionibus Tanaicensibus inter gradum 54 et 55 lati- 



tudinis"). 

 Nyroca nyroca nyroca, Rogers and Deignan, Proc. Biol. Soc. Washington, 1934, 



p. 91 (Chiang Mai). 

 Nyroca nyroca, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1936, p. 75 (Chiang 



Mai). 



