NO. 14 THE RACES OF PELLORNEUM RUFICEPS — ^DEIGNAN I9 



be one of the main speciation centers of southeastern Asia, this bird 

 will probably prove to be representative of a still undescribed race. 



26. PELLORNEUM RUFICEPS subsp. 



Three specimens from the isolated forest at Trangbom, Bienhoa 

 Province, Cochin-China, must for the present be left unnamed. They 

 have the under parts somewhat as in P. r. ubonense, but the upper 

 parts much more rufescent. 



27. PELLORNEUM RUFICEPS EUROUM, new subspecies 



Type. — U.S.N.M. No. 3371 19, adult male, collected at Chanthaburi 

 (lat. I2°35' N., long. I02°05' E.), Chanthaburi Province, south- 

 eastern Siam, on April 19, 1937, by H. G. Deignan (original number 



2527). 



Diagnosis. — A very saturate race, near to P. r. vividum, from 

 which it is barely distinguishable in series by having the brown of 

 the upper parts slightly darker and even more rufescent ; the dark 

 centers to the feathers of the uppermost back less often present and 

 then more obsolescent ; the under parts washed with a very slightly 

 warmer buff. 



From P. r. acrum easily separable by having the rufous of the fore- 

 head, crown, and nape, and the brown of the remaining upper parts 

 deeper in tones ; the central streaks of the feathers of the breast and 

 sides of the abdomen much broader and bolder. 



Range. — Southeastern Siam (Rayong, Chanthaburi, and Trat 

 Provinces). 



Specimens examined. — Siam: Trat Province: Ban Bang Phra (i 

 male, 2 females) ; Chanthaburi Province: Chanthaburi (4 males, 2 

 females), Khao Sa Bap (i male, i female), Khao Soi Dao (i male, 

 3 females) ; Rayong Province: Ban Hup Bon (i male). Ban Si fiacha 

 (i female). Ban Nong Kho (i male). 



Remarks. — Under the following form I shall explain why the name 

 smithi seems to me inapplicable to birds from the mainland of south- 

 eastern Siam. 



28. PELLORNEUM RUFICEPS SMITHI Riley 



PeUorneum smithi Riley, Proc. Biol. Soc. Washington, vol. 37, Oct. 21, 1924, 

 p. 129 (Ko Chang, off Trat Province, southeastern Siam, at lat. i2°oo' N., 

 long. 1 02° 30' E.). 



Diagnosis. — The unique specimen differs from any one of 18 ex- 

 amples of P. r. enroum (including three from the nearby mainland 



