236 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



green of the back. This intermediate character o f the Khun Tan 

 population is confirmed by geography, for on Doi Suthep (about 32 

 miles northwest of Doi Khun Tan) we find only burmae, while at Ban 

 Mae Mo (about 32 miles east-southeast of Doi Khun Tan) only 

 laotionus occurs. 



Because of the possibility of perfectly matching specimens of 

 laotianus and burmae with certain examples from Khun Tan, both 

 names have been synonymized by authors with chlorolophoides. The 

 employment of a single designation for the quite distinct forms of Pegu 

 and Laos leads to nullification of the real purpose of nomenclature, 

 and it seems advisable to recognize both a western and an eastern 

 race; the unstable intermediates of the Khun Tan chain, while not 

 deserving of subspecific separation, may conveniently be known by 

 Gyldenstolpe's name, since it is already available for them. 



PICUS CHLOROLOPHUS LAOTIANUS Delacour 



Lao Lesser Yellow-naped Woodpecker 



Picus chlorolophus laotianus Delacoub, Bull. Brit. Orn. Club, vol. 47, 1926, p. 12 



(Chiang Khwang, Laos). 

 Picus chlorolophus chlorolophus [partim], Gyldenstolpe, Kungl. Svenska Vet- 



Akad. Handl., 1913, p. 47 (Pak Pan, Den Chai). 

 Picus chlorolophus chlorolophus, Gyldenstolpe, Journ. Nat. Hist. Soc. Siam, 1915, 



p. 229 (listed). 

 Brachylophus chlorolophus chlorolophus [partim], Gyldenstolpe, Kungl. Svenska 



Vet.-Akad. Handl., 1916, p. 90 (Pang Hua Phong, Pha Kho). 

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



p. 599 ("Various localities in Siam")- 

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



172, 1938, p. 216 (Ban Nam Khian). 



The present race is widespread in those portions of our area lying 

 east of the Khun Tan hills and south of Chiang Rai Province ; at Ban 

 Mae Mo it occurs only 32 miles from the type locality of chlorolo- 

 phoides. 



I found this bird common in the evergreen on Phu Kha at 4,500 feet, 

 but otherwise it has been collected only at low elevations, whether in 

 evergreen or in deciduous forest. Gyldenstolpe considered it fairly 

 common in the dry jungles at Pak Pan and Den Chai, and I observed 

 it at Mae Mo in a similar environment. 



P. c. laotianus differs from burmae in the more or less complete 

 absence of golden suffusion from the plumage of the upperparts, with 

 the result that the crest is lemon yellow, the back a duller and purer 

 olive-green. 



PICUS FLAVINUCHA LYLEI (Boden Kloss) 



Thai Greater Yellow-naped Woodpecker 



Chrysophlegma flavinucha lylei Boden Kloss, Ibis, 1918, pp. 110-111 (Ko Lak 

 [=Prachuap Khirikhan], southwestern Thailand). 



