( 410 ) 

 385. Micrastiir gilvicoUis (Vieill.). 



Sparviiis i)ilvkollh Vicillot, .Yr<?ii'. Did. x. p. 3J.1 (1817. — loc. igQ. : we substitute Cayennr ; type in 



Paris Museum ex.imined). 

 Miciasliir gilriciillix Pilzcln, l.r. p. 7 (Borbu) ; Hellmayr, Xm-. Znol. .xiv. p. 405 (Borba). 



No. 624. S ad., S. Isabel, Rio Preto, 4. .\. l'.H)T._Wiiij,' 170; tail 163 mm. 



"Iris and feet yellow, Mil blacU, base of lower inaudible, eere, and bare space 

 round the eye yellow." 



This bird eoiubine.s the projiortioa of the toes (outer decidedly longer than 

 inner) of Jf. jjclzelni Hidgw.* witli the unbarred, uniform white abdomen 

 of J/, gihicollis. Another (immature) specimen, secured by Mr. Hoffmanns 

 on liis first jonriiey to the Madeira district, is, liowever, typical of </ilri<-ollis. I 

 am sorry to say that, after e.\amiiiing large series of these birds, 1 am unable to 

 distinguish between ^f. gilricollis and M. pelzelni. The differences put forward 

 by Mr. liidgway in his " JMonograph of the Genus Micrastur,"t the most compre- 

 hensive and elaborate paper ever publislied on these jiuzzling birds, are evidently 

 individual variations of the same species. This is conclusively proved by a series 

 of twelve adults from British Guiana ((jnonja, Bartica Grove, Camacusa, River 

 Carimang; H. Whitely, jnn., coll.) in the British Museum. Six specimens have 

 the inner and outer foes nearly of ecjiial length, a feature claimed by Ridgway for 

 M. concriitricus (= qildcoHis Yieill.). In two of them the lower breast, abdomen, 

 and under tail-coverts are unbarred white, in three others {S Camacnsa, i ? Bartica 

 Grove) the latter show more or less distinct dusky cross-lines, while a female from 

 Quonja has all the under j)arts (except throat) regularly and even more broadly 

 banded with blackish than the type of M. pchdni. The six other examples have 

 the outer toe decidedly longer than the inner one {" pi'l.^cl/ii") ; the amount of 

 dusky barring on the belly preseuts the same variation as described iibove. It 

 must be admitted that the type of .1/. pchrlni {6 ad., Sarayaru, Ucayali, Eastern 

 Peru : E. Bartlett coll., August '2, 1S(!5 : Brit. Mns.) has the throat slightly greyer, 

 but other Peruvian skins, particularly au adult lualo from Iqnitos, do not differ in 

 this respect from the Guianan series, some of which are, besides, decidedly inter- 

 mediate in the jiroportion of the lateral toes. 



[386. Dinospizias pectoralis (Bonap.). 



Axtiir ppclnralh Bonaparte, Rrc. Mag. Zonl. (-1) ii. p. 4',M) (IB.'jO. — ■Brvsil"); Pelzeln, I.e. p. G 

 (Borba). 



Right bank : Borba (Natterer). 



This remarkable species seems to me geuerieally distinct from any of the 

 American Accipiters. Natterer, besides one at liorba, obtained two examples 

 in the vicinity of Ypanema, S. Paulo. Euler forwarded a single adult male from 

 Ganfagallo, ]irov. Rio de Janeiro, to the Berlin Museum, | and Count Berlepsch 

 possesses a Bahia skin. Although very rare in collections, it appears to be rather 

 widely distributed in Brazil.] 



3^7. Accipiter superciliosus (Linn.). 



Falco siiperciliiiHux Linnaeus, ^i/si. Xnl. xii. 1. p. !:;>> (17ljl). — Surinam : juv.). 

 Accijitter thiits auct. 



No. 043. ? imm., Maruins, •,'•,'. vi. I'.mS. " Iris and feet yellow, bill blark." — 

 AViiig 135 ; tail 98 mm. 



• I'roe. .lead. Alt. .Sri. Philad. 1S75. p. 4!(4 (Saiayaju, Cppcr Ucavali, E. I'eru). 



t Proc. Acad. N..'. Sci. I'hilad. 1S75. pp. 470.502. J Cabanis, Journ.f. Oinilh. 1874. p. 228. 



