THE BIRDS OF NORTHERN THAILAND 305 



Examples taken between July 20 and November 9 are in postnuptial 

 molt. 



Two adult females had the irides bright brown; the eyelids slaty 

 gray ; the bill dark slate, paler at the rictus ; the interior of the mouth 

 black ; the feet and toes brownish black ; the claws horny black. 



The adult of either sex has the head, neck, breast, and upper back 

 sooty gray; the scapulars, back, and upper tail coverts dull rufous- 

 brown ; the rump rufous-buff ; all the wing coverts and the outer webs 

 of the inner secondaries silvery gray, the rest of the wing black; the 

 long, graduated tail silvery gray, each feather with a broad, black tip ; 

 the remaining underparts rufous-buff. Immature birds have the head, 

 neck, breast, and upper back more brownish and not clearly defined 

 from the adjacent color areas; the secondaries narrowly, the rectrices 

 much more broadly, tipped with buff. 



As in all species inhabiting the deciduous forests, the plumage of this 

 bird rapidly becomes worn and discolored and properly to understand 

 the geographic variation requires series of freshly molted adults. 

 Too many races have been described from our subregion on unsuitable 

 material and without reference to previously named forms of nearby 

 areas. While single specimens from Thailand can scarcely be differ- 

 entiated, with series I find it just possible to recognize three subspecies : 

 (1) saturatior of southwestern Thailand (Kanchanaburi north to 

 Rahaeng), in which the gray hood is poorly defined from the dull 

 rufous-brown back and the buff underparts are palest; (2) kinneari of 

 northwestern Thailand (north of Rahaeng and west of the Khun Tan 

 range), which differs from saturatior in having the gray hood more 

 clearly defined from the rather brighter rufous-brown back and the 

 buff underparts deeper in tone ; (3) sakeratensis of the remaining por- 

 tions of the country, which differs from kinneari in having the hood 

 rather darker (almost slaty), the rufous-brown of the back and the 

 buff of the underparts slightly deeper. 



It may be necessary eventually to merge certain of our forms with 

 races described from South India, but I lack the material essential for 

 an investigation of this problem. 



CRYPSIRINA VAGABUNDA SAKERATENSIS (Gyldenstolpe) 



Indo-Chinese Rufous Tree Pie 



Dendrocitta rufa sakeratensis Gyldenstolpe, Bull. Brit. Orn. Club, vol. 41, 1920, 



pp. 32-33 (Ban Chakkarat, East Thailand). 

 Dendrocitta rufa, Gyldenstolpe, Kungl. Svenska Vet.-Akad. Handl., 1913, p. 19 



([Pak Pan, Den Chai] ) ; Journ. Nat. Hist. Soc. Siam, 1915, p. 164 (listed). 

 Dendrocitta rufa [partim], Gyldenstolpe, Kungl. Svenska Vet.-Akad. Handl., 



1916, p. 17 (Den Chai, Pak Pan, Pha Hing) ; Ibis, 1920, p. 449 ("Northern 



Siam" [partim]). 



