( 410 ) 
385. Micrastur gilvicollis (Vieill.). 
Sparvius gilvicollis Vieilot, Nouv. Dict. x, p, 323 (1817.—loe. ign.: we substitute Cayenne: type in 
Paris Museum examined), 
Micrastur gilvicollis Pelzeln, l.c. p. 7 (Borba) ; Hellmayr, Nov, Zool. xiv. p. 405 (Borba), 
No, 624. 3 ad., 8. Isabel, Rio Preto, 4. x. 1907,—Wing 176; tail 163 mm. 
“Tris and feet yellow, bill black, base of lower mandible, cere, and bare space 
round the eye yellow.” 
This bird combines the proportion of the toes (outer decidedly longer than 
inner) of M. pelzelni Ridgw.* with the unbarred, uniform white abdomen 
of M. gilvicollis. Another (immature) specimen, secured by Mr. Hoffmanns 
on his first journey to the Madeira district, is, however, typical of gilvicollis. I 
am sorry to say that, after examining large series of these birds, I am unable to 
distinguish. between M/. gilvicollis and M. pelzelni. The differences put forward 
by Mr. Ridgway in his “ Monograph of the Genus Micrastur,” ¢ the most compre- 
hensive and elaborate paper ever published on these puzzling birds, are evidently 
individnal variations of the same species. This is conclusively proved by a series 
of twelve adults from British Guiana (Quonja, Bartica Grove, Camacusa, River 
Carimang ; H. Whitely, jun., coll.) in the British Museum. Six specimens have 
the inner and outer tocs nearly of equal length, a feature claimed by Ridgway for 
M. concentricus (= gilricollis Vieill.). In two of them the lower breast, abdomen, 
and under tail-coverts are unbarred white, in three others (3 Camacusa, 3 9 Bartica 
Grove) the latter show more or less distinct dusky cross-lines, while a female from 
Quonja has all the under parts (except throat) regularly and even more broadly 
banded with blackish than the type of M. pelzelni. The six other examples have 
the outer toe decidedly longer than the inner one (“ pelzelni”’); the amount of 
dusky barring on the belly’ presents the same variation as described above. It 
must be admitted that the type of Jf pelzelni (3 ad., Sarayacu, Ucayali, Eastern 
Peru ; E. Bartlett coll., August 2, 1865: Brit, Mus.) has the throat slightly greyer, 
but other Peruvian skins, particularly an adult male from Iquitos, do not differ in 
this respect from the Guianan series, some of which are, besides, decidedly inter- 
mediate in the proportion of the lateral toes, 
(386. Dinospizias pectoralis (Bonap.). 
Astur pectoralis Bonaparte, Rev. Mag. Zool. (2) ii. p. 490 (1850,—“ Brésil”) ; Pelzeln, lc. p, 6 © 
_ (Borba). 
Right bank: Borba (Natterer). 
This remarkable species seems to me generically distinct from any of the 
American Accipiters. Natterer, besides one at Borba, obtained two examples 
in the vicinity of Ypanema, 8S. Paulo. Euler forwarded a single adult male from 
Cantagallo, prov. 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.] 
_ 387. Accipiter superciliosus (Linn.). 
Falco superciliosus Linnaeus, Syst. Nat. xii. 1, p. 128 (1766.—Surinam : juv.), 
Accipiter tinus auct. 
No. 943. $ imm., Marnuins, 22. vi. 1908. “Iris and feet yellow, bill black.”— 
Wing 135; tail 98 mm. 
* Proc, Acad. Nut. Sci. Philad, 1875. p. 494 (Sarayagu, Upper Ucayali, E. Peru). 
+ Proc. Acad, N..*, Sci, Philad. 1875. pp. 470-502, t Cabanis, Journ. f. Ornith. 1874, p. 228. 
