THE BIRDS OF NORTHERN THAILAND 235 



bleaching, wear, and stains. Males in fresh plumage have the front 

 and a long supercilium deep crimson; the crown deep olive-green, 

 with few or many of the feathers tipped deep crimson ; a broad nuchal 

 crest deep golden-yellow; the remaining upperparts bright olive- 

 green, strongly suffused with golden, especially on the back, rump, and 

 upper tail coverts ; the rectrices black ; the inner primaries and outer 

 secondaries with the outer web largely chestnut-red, the inner web 

 black with white spots near the edge; a narrow white streak below 

 the eye from the base of the bill to below the ear coverts; a broad 

 crimson malar stripe ; the throat and breast brownish olive, with white 

 bases of the feathers showing through on the throat ; the remaining 

 underparts closely banded whitish and dull brownish. Females dif- 

 fer in having the crimson on the head restricted to the sides of the 

 hind-crown. 



Subspecific differences in the populations of northern Thailand are 

 discussed under the following forms. 



PICUS CHLOROLOPHUS CHLOROLOPHOIDES (Gyldenstolpe) 



Khun Tan Lesser Yellow-naped Woodpecker 



Brachylophus chlorolophoides, Glydenstolpe, Orn. Monatsb., vol. 24, 1916, p. 29 



(Khun Tan, North Thailand). 

 Brachylophus chlorolophoides, Glydenstolpe, Kungl. Svenska Vet.-Akad. Handl., 



1916, p. 90 (Khun Tan). 

 Brachylophus chlorolophus chlorolophoides [partim], Gyldenstolpe, Ibis, 1920, 



p. 599 (Khun Tan). 

 Cirropicus chlorolophus chlorolophoides [partim], Riley, U. S. Nat. Mus. Bull. 



172, 1938, p. 216 (Doi Hua Mot, Doi Langka, Khun Tan). 



The present form is confined to the forests of the Khun Tan range, 

 occurring from Doi Khun Tan in the South to the Nang Kaeo-Langka- 

 Hua Mot complex of mountains in the North. 



Nothing is recorded of this bird's habits, which are doubtless pre- 

 cisely like those of burmae. Dr. Smith has noted that some of his 

 specimens were taken at 4,000 feet. All examples collected between 

 August 23 and October 17 are in molt. 



The Khun Tan subspecies is separable from burmae and laotianus 

 on average differences, which can be seen only by careful study of 

 extensive series. 



In Washington are 16 absolute topotypes of chlorolophoides, taken 

 throughout the year, which show that Gyldenstolpe has unfortunately 

 bestowed his name upon an unstable population, more or less exactly 

 intermediate between burmae and laotianus. Of the series, one speci- 

 men is indistinguishable from true laotianus, several others from 

 burmae, and the remainder fall somewhere between the two, varying 

 in the degree of golden suffusion in the yellow of the crest and the 



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