NO. 2255. 



CATALOGUE OF SIBERIAN BIRDS— RILEY. 



621 



Family PARIDAE. 



62. PENTHESTES CINCTUS KOLYMENSIS (Bnturlin). 



Two males and one imsexed, 80 miles from the mouth of Little 

 Annu j Eiver, November 13 and 14, 1914 ; one male, Verkhni Kolymsk, 

 April 14, 1915 ; one male and one female, 67 miles west of Verkhni 

 Kolymsk, May 12, 1915. 



These birds appear to be paler than Penthestes c. alascensis, espe- 

 cially on the flanks. 



These remain even in tlie lower Kolyma througliout the year. — C. A. 



This series measures as follows: 



Family MOTACILLIDAE. 



63. MOTACILLA ALBA OCULARIS Swinhoe. 



One male, 40 miles south of the mouth of the Kolyma River, July 

 6, 1915 ; one male, 7 miles north of Nijni Kolymsk, May 17, 1915. 



64. BUDYTES FLAVUS PLEXUS Thayer and Bangs.i 



One immature, in white plumage, Koliutschin Bay, August 10, 

 1914; one male, 7 miles north of Nijni Kolymsk, June 2, 1915; two 

 males and two females, Nijni Kolymsk, June 16, 17, and 27, 1915. 



In the above series of adults three have the narrow white super- 

 ciliary as given by Thayer and Bangs,^ and two are without it. The 

 latter, when compared with B. f. borealis, are duller in color, not 

 nearly so bright on the back. In a series of nine (seven breeding 

 birds) of B. f. simiUima from Kamchatka, the white superciliary 

 extends forward to the bill in every case, and it would appear that 

 any specimen in which it occurs only posterior to the eye is aberrant. 

 B. f. simillinna seems to be brighter above with the gray of the top 

 of the head more sharply defined against the back than in B. f. 

 plexus. I regard the latter as a good race, though I am aware that 

 my remarks do not agree with what Thayer and Bangs have written. 

 Below I give the measurements of a series of males of B. f. simiUima 

 and B. f. plexus., which suggests the possession of a longer bill by the 

 former. 



1 Free. New England Zool. Club, vol. 5, 1914, p. 41. 

 "Idem, p. 42. 



