880 Oit the i^htdij of Xi'stltiiii Birds. [Ibis, 



till" moro iinpoitaiit IcatluM's liaxc lilaiiu'utous piMiou'iations, 

 and tlu'sc oltcii t'oriu a sort dI' iViiii;-!' to tlu' rouiuli'il i-iul ol" 

 the t'l^athcrs. In tlii" (iosliawk these barb-oxtcnsions are 

 delicate and taperini;-, hnt they are sometimes (piite hlnnt as 

 in .ttjii'ilti 1/(1 rill. \\ here these fdamentons prohmi^at ions 

 oi'enr [>. v. on thi' stHunidaries in younj;- (Joshawks) the pre- 

 peinue down-tnl'ts ai'e carried on the extremities of the eential 

 on(>s, opposite the tMid ol' thi> slialt. I'^roni this laet it setMns 

 prohahli' that thesi^ haib-prolonji'alions foriii the de^'enerate 

 remains o( w owcv distinct ineso()tih' phimaiii\ a i^enei'atiou of 

 plnmaii'e whicii may he still fonnd in a t'airly eomijlete form 

 in till' 'I'awnv 0\\\. It shonld he noted that wlu-rethc harb- 

 })roion^ations are wanting, as always appi'ais to be tlu> ease 

 with the lesser eontour-featliers on the crown, back, etc., 

 the pri'-pennu' ilown-tnl'ts ai'c si>ssile (ii:;'. 17, j). S75). 



A close examinati(Hi of the neossopt iles in ditl'erent jicnera 

 I'eveals considerable strnetnral variation in these reatliers. 

 in the present pap("r 1 havt> onlv hinted at a l'e\> ol' these 

 dilTerenei's. hnl 1 hope at some futuri> date to make use of 

 tlie data and material in my possession, and also to elaborate 

 my notes on certain nidifnyous sj)eeies. 



[Note. — The tigures are all lariiir than natural size. 

 Unfortunately, owing to the tact that they wi-rc drawn 

 direi't frinn lif(^ at ditferent times, the scale to wliieii they 

 have been cnlarginl varies in almost every ease.] 



XXXITI.— iVo/c.s^ on the B'tnh of Xorth-East CJ/ihli, in 

 North China. Part 11.* By J. D. 1). La ToucHi!:, 



c.:\i.z.s., M.B.O.U. 



7;>. Merula hortnlonim (P. Scl ). 



Tiirdiis horltdonun and Tnrdus pe/ios 1). ^^ O. p. 151. 



Aleriila hortn/onnn La T. p. 57L 



'file Grt^v-backed Ouzel is of irregular oecurrenee at Chin- 

 waiigtao. In IDll. 1 saw three on the :J'.)th ot' April and 

 1st o\' ^lav. but did not nuxM with any others until IDll, 



* Vov Tart I., n'lfr siiiu'ii. jip. lil'O ()71. 



