504 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



at the postnuptial molt; other winter specimens wear a livery variably 

 intermediate between those of summer and winter ; even what I have 

 for convenience called the "normal" winter plumage is characterized 

 by pure black crown, nape, and upper tail coverts, while the gray of 

 the mantle seems never to be wholly free of blackish sullies. 



MOTACILLA ALBA BAICALENSIS Swinhoe 



Davurian Pied Wagtail 



Motacilla baicalensis Swinhoe, Proc. Zool. Soc. London, 1871, p. 363 ("Eastern 



Asia"). 

 Motacilla alba leucopsis, de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 1928, 



p. 560 (Chiang Mai). 

 Motacilla leucopsis [partim], Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1931, 



p. 153 (Chiang Mai [partim]) ; 1936, p. 121 (Chiang Mai [partim]). — de 



Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 1934, p. 238 (Chiang Mai 



[partim] ) . 

 Motacilla alba baicalensis, Riley, U. S. Nat. Mus. Bull. 172, 1938, p. 470 



(Lampang). 



In addition to the specimen from Lampang reported (1938) by Riley, 

 I place here two examples collected by de Schauensee at Chiang Mai 

 and five others taken by me at Chom Thong and Ban Thung Ma Num. 

 The extreme dates for its stay in Chiang Mai Province are Septem- 

 ber 26 (1936) and March 9 (1928). 



It is worthy of note that the five birds secured by me were all shot 

 on extensive sandbars along the Mae Ping; it may be found that this 

 race confines itself to the immediate vicinity of the larger streams. 



Two specimens of November 5 and 12 are wearing what seems to be 

 the nuptial dress; this plumage differs from what I have called the 

 "normal winter dress" of M. a. leucopsis in having the mantle a rather 

 paler gray without any trace of blackish suffusion, this gray gradually 

 deepening posteriorly to become black or blackish only on the longest 

 upper tail coverts; the sides of the breast and the flanks strongly 

 washed with gray. The normal winter plumage of baicalensis differs 

 from that just described in having the crown and nape concolorous 

 with the mantle or, at the most, merely sullied with blackish. 



MOTACILLA ALBA OCULARIS Swinhoe 



Chukotsk Pied Wagtail 



Motacilla ocularis Swinhoe, Ibis, 1860, p. 55 (Amoy, China). 



Motacilla leucopsis [partim], Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1931, 



p. 153 (Chiang Mai [partim]). 

 Motacilla ocularis, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1936, p. 120 



(Chiang Mai). 

 Motacilla alba ocularis, de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 1934, 



p. 238 (Chiang Mai).— Riley, U. S. Nat. Mus. Bull. 172, 1938, p. 470 (Chiang 



Mai, Lampang). 



