408 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



place where the current was swift and strong. It is one of the most 

 active birds imaginable, dashing about on the wet rocks in mid- 

 current with constantly flirted tail or making butterflylike flights into 

 the air after some passing insect. 



An adult female had the irides dark brown ; the bill black ; the feet 

 horny brown ; the toes darker ; the claws dark brown. 



The adult male has the wings blackish, the outer webs of the feath- 

 ers narrowly edged slaty blue and the greater coverts with small white 

 tips; the rectrices and upper and under tail coverts chestnut-rufous; 

 the rest of the plumage slaty blue, somewhat paler on the abdomen. 

 The adult female has the forehead, crown, and mantle bluish ashy, 

 sometimes suffused with brownish; the upper tail coverts white; the 

 wings blackish brown, the feathers edged light brown along the outer 

 web (the inner secondaries sometimes edged ashy white), the coverts 

 and inner secondaries with small white tips; the rectrices blackish 

 brown with broad white bases, the white portion outwardly increas- 

 ing in extent until the outermost pair are almost wholly of this color; 

 the underparts ashy white, each feather with a bluish-ashy subter- 

 minal bar which gives this area its predominant hue (the chin, sides 

 of the upper throat, cheeks, lores, and front often suffused with fer- 

 ruginous) ; the under tail coverts white. 



PHOENICURUS LEUCOCEPHALUS Vigors 



White-capped Water Redstart 



Phoenicura leucocephala Vigobs, Proc. Cornm. Sci. Corr. Zool. Soc. London, pt. 1, 

 1830-1831 [=1831], p. 35 (Himalayas; type locality restricted to Simla-Al- 

 mora district, by Ticehurst and Whistler, Ibis, 1924, p. 471). 



Chaimarrornis leucocephala, Greenway, Bull. Mus. Comp. Zool., 1940, p. 179 (Doi 

 Ang Ka). 



I watched a pair of white-capped redstarts at the top of the great 

 waterfall of the Mae Klang (at the foot of Doi Ang Ka), March 15, 

 1930, and in April 1931 found the species occurring uncommonly along 

 the same stream from the waterfall up to an elevation of 3,500 feet. 

 The members of the Asiatic Primate Expedition took a female on Doi 

 Ang Ka (probably along the Mae Klang) at 4,300 feet, February 27, 

 1937. The only other Thai locality from which the bird has been 

 recorded is Doi Suthep, where a male was collected by a Thai skinner 

 at the waterfall of Huai Kaeo (1,100 feet), March 27, 1937; this speci- 

 men was deposited in the Raffles Museum at Singapore. 



The delayed discovery of so conspicuous a form on Doi Suthep, at 

 the very spot where I had sought it unsuccessfully over a period of 

 years, leads me to believe that it is wholly or partially migratory in 

 Thailand and, in this connection, it is noteworthy that every observa- 

 tion of it on Doi Ang Ka has been made during the cold weather. 



