b PTEROCLIB^, 



tail-coverts chestnut, tipped with white, and widely barred with 

 black. Centre pair of tail-feathers like the upper tail-coverts, and 

 produced into long blackish-grey filaments : rest of the tail-feathers, 

 of which the outer pair are much the shortest, similar to the under 

 tail-coverts. Total length IG inches, wing fi-8, tail 7"9, tarsus 1. 



Adult female. Differs from the male in having the whole of the 

 upper parts irregularly barred with black ; most marked on the 

 elongate tertiaries : the upper breast, as well as the chest, barred 

 with black, and the centre pair of tail-feathers less developed. 

 Total length 15 inches, wing 9-7, tail 7*4, tarsus 1. 



A quite immature bird resembles the adult female, but has only a 

 trace of yellow about the ear-coverts, and the barring on the upper 

 parts of the body is coarser and more irregular. 



A nestling from Thibet closely resembles in every particular the 

 figure of S. paradoxus given in the ' Ibis,' already mentioned. 



Hah. Thibet ; extending northwards to the steppes of Koko-Nor, 

 west to the Pamir, and south to Ladak and the upper portions of 

 the Sutlej Valley. 



a-c. c? ad. sk. Kashgar (BelleiLi). India Museum [P.I. 



d,e. S 9- fl'd. sk. Pamir, May (BidcMph). Hume Coll. 



/. (5 ad. sk. Gulcha, Pamir. St. George Littledale, 



Esq. [P.]. 



g. 2 ad. sk. Karakoram (Belleiv). India Museum rp.]. 



h, i. (S $ ad. et Gogra, Aug. {F. StoUczka). India Museum [P.]. 



imm. sk. 



k-t. S ad. sk. Ladak. Hume Coll. 



M, V. cJ 5 ad. sk. Masinik Pass, Oct. & Dec. Hume Coll. 



(Henderson). 



7v. S ad. sk. Thibet, Feb. Tweeddale Coll. 



a--/'- 6 2 ad. sk. Thibet, April, May, Sept., Hume Coll. 



& Nov. {Mandelli). 



(f. S ad. sk. Thibet. Lord Gifford [P.]. 



'h'-k'. 2 ad. sk. & Thibet. Major Charlton [P.]. 



juv. et pull. st. 



2. PTEROCLURUS. 



Type, 

 ffinas, Vieill. {nee Latr. Col 1802) Analyse, p. 52 (1816). P. alchata. 

 Pteroclurus, Bonap. Compt. Rend. xlii. p". 880 (1856) .... P. alchata. 

 Pterygocius, Heine, Nomencl. Mus. Hein. p. 288 (1890) . . P. alchata. 



Tarsi feathered ; toes naked ; small hallux always present ; two 

 central tail-feathers elongate, and more or less produced into 

 filaments. 



Bange. Africa, S. Europe, and S.W. Asia. 



Keg to Hie Species. 



A , Lower breast and belly pure white. 

 n. Throat black. 



«'. Subtermiual bars of wing-coverts white . . alchata c? , p. 7. 



h'. Subtermiual bars of wing-coverts yellow. . ^j^rewajcws cJ, p. 9. 

 b. Throat white. 



c'. Subterminal bars of wing-coverts white . . alchata 2 . P- 7. 



d'. Subtermiual bars of wing-coverts yeUow. . pyrenaicus 2> P- 9. 



