374 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



On Doi Ang Ka it is very common from about 5,000 to 6,800 feet, 

 somewhat less so thence to the summit; on Doi Suthep it has been 

 recorded but twice (at 5,500 feet) : February 6, 1933, and February 

 6, 1936; east of the Khun Tan range it is known only from Phu Kha, 

 where it is rather rare. 



On Ang Ka Luang it is one of the most conspicuous forms of the 

 dense evergreen and may be seen in large flocks (usually accompanied 

 by other small timaliine species). It has the titlike habit of flutter- 

 ing jerkily up the trunks of the larger trees, uttering a ceaseless 

 conversational chippering. 



An example with the gonads enlarged was taken on Doi Ang Ka, 

 April 29 ; another, which has virtually completed the postnatal molt, 

 on Doi Langka, April 24. The only specimen seen in postnuptial 

 molt was collected on Doi Hua Mot, August 17. 



A breeding male had the irides brown; the maxilla black; the 

 mandible with the apical half plumbeous, otherwise pale yellowish; 

 the rictus and interior of the mouth bright yellow ; the feet and toes 

 horny yellow; the claws yellowish horn. An adult female had the 

 irides maroon ; the maxilla dark brown ; the mandible with the apical 

 half brown, then fleshy white, and yellow at the base ; the rictus and 

 interior of the mouth bright yellow ; the feet, toes, and soles dull yellow ; 

 the claws horny. 



This species has the forehead, crown, and nape chestnut, the feathers 

 of the forehead with broad white centers, those of the crown and nape 

 with rufous- white shaft streaks ; the mantle olive, more or less suffused 

 with rufous ; the primary coverts black ; the outermost primaries with 

 the outer web grayish white, the others with the outer web largely 

 orange-rufous ; the exposed portions of the wing otherwise olive ; the 

 tail dark gray, washed with olive; a white supercilium; the ear 

 coverts silvery white, bordered above by a broad, black postocular 

 streak, below by a narrow, black mustachial streak; the underparts 

 white, heavily washed on the sides of the neck and breast and along 

 the flanks with olivaceous-buff. 



Without recently collected material of castaneceps, it is really 

 impossible to decide whether exul is a valid form. Old skins of the 

 former differ from fresh skins of the latter in having the underparts 

 washed with ochraceous-buff, not olivaceous-buff, so, at least for the 

 present, I accept Delacour's race. Since birds taken east and west of 

 the Khun Tan chain are inseparable, one may assume that exul, if 

 distinct, ranges from Laos to Tenasserim. 



ALCIPPE RUFOGULARIS MAJOR (Stuart Baker) 



Moyen-Laos Rufous-throated Babbler 



Schoeniparus rufigularis major Stuart Baker, Bull. Brit. Orn. Club, vol. 41, 

 1920, p. 11 (Pak Mat, "Siam" [=Pak Mat, Moyen-Laos]). 



