33 [Vol. xli. 



Ti/pe. Ad. ^ , collected at Sakerat in Eastern Siam, 

 5 til JannaiT, 1912. 



Distribution. Apparently only confined to Eastern Siam, 

 and even there comparatively rare. 



Lord Rothschild exhibited two new birds discovered by 

 Captain Angus Buchanan in Asben (Ai'r) in the Central 

 Sahara, which he described iis follows: — 



Uyrmecocichla buchanani, sp. nov. 

 ^ ad. Upperside blackish brown, crown more brownish 

 and with paler edges to the feathers ; one-half to two-thirds 

 of the basal portion of the inner webs of the primaries white; 

 tail more blackish. Underside yqvj dark brown, feathers of 

 throat, chest, and breast with pale brownish-grey edges, 

 tinged with buflf ; ear-coverts uniform deep brown. " Iris 

 dark brown, bill and feet black." Wing 110-117, females 

 ai)parently the smaller ones ; tail 76-79, bill from base 

 22-24 mm. Juv. : Edges to the feathers more rufons. 



Hah. Damergou and Zinder, south to Kana in Northern 

 Nigeria. 



Type. In the Tring Museum. J ad. Takoukout, 

 Damergou, 1550 feet, north of Kano, 13.iii.l920. No. 441. 

 Collected by Angus Buchanan. 



Named after Captain Buchanan. 



Tills form is allied to M. formicivora cethiops, but the bill 

 is longer, the colour of the males not so black, and the edges 

 to the feathers of the throat and breast are lighter and 

 wider. 



Antlius sordidus asbenaicus, subsp. nov. 



The Pi[at breeding in the mountains of Asben (A'ir), in 

 the Central Sahara, is, of all the forms known to us, nearest to 

 Antlvas sordidus hararensis (A. niclio'lsom hararensis Neum.) 

 from Harar and Northern Somaliland, but more rufescent, 

 especially on the rump and upper tail-coverts, the chest is 

 less spotted and the flanks paler. There is also, as a rule, 

 less brown on the inner webs of the outermost tail-feathers. 



Hah. Mt. Baguezan, Asben (Air), Central Sahara, 5200 

 feet. 



