364 MESSRS. SCLATER AND SALVIN [May 27, 
12. CeNTURUS ALBIFRONS (Sw.). 
Picus albifrons, Sw. Phil. Mag. 1827,1. p. 439 ; Sund. Pie. p. 52 ; 
Cab. Journ. f. O. 1862, p. 324. 
Centurus santacruzi, Bp. P. Z. S. 1837, p. 116; Sclater, Cat. 
A. B. p. 343. 
We have hitherto called this species by Bonaparte’s name; but 
there can be no doubt that, as pointed out by Cabanis, it is the P. 
albifrons of Swainson. It is common in Southern Mexico and 
Guatemala. 
13. Bureo eveGans, Cassin; Baird, B. N. A. p. 28. 
Mr. le Strange’s collection contains a single skin of this Buzzard, 
agreeing with Texan specimens collected by Mr. Dresser. We have 
also seen an example of it in a collection recently sent to M. Sallé 
from Orizava by M. Botteri. 
14. Orratipa veTuLA, Wagler, Isis, 1830, p. 1112, et 1832 
p- 1227; Sclater, P. Z. S. 1859, p. 391. 
O. poliocephala, Sclater, P. Z. 8S. 1856, p. 310. 
Mr. le Strange’s collection contains a single skin of this Ortalida, 
which he found “very common” in the tierra caliente of the 
Atlantic. He shot many on the road to Tampico, in April 1866. 
We believe that the Texan bird called by the American ornitholo- 
gists O. vetula, O. poliocephala, and O. maccalli is probably refer- 
able to this species. 
15. ORTALIDA POLIOCEPHALA, Wagler, Isis, 1830, p. 1112, et 
1832, p. 1227. 
Two skins of this species, in Mr. le Strange’s collection, are the 
first we have met with. It is immediately distinguishable from the 
preceding by its larger size, longer tail, whiter belly, and the much 
broader terminal bands of the tail-feathers, which are fulvous and not 
pure white. 
‘ 
2. Notes on the Species of the Genus Micrastur. By P. L. 
Scrater, M.A., Ph.D., F.R.S., and Osperr Satvin, 
M.A., F.L.S. 
As in case of the Asturine, to which we have lately called the 
Society’s attention*, some of the members of the genus Micrastur 
are at present in a state of great confusion. We trust that the 
following remarks may serve to render the species of the group with 
which we are acquainted more readily distinguishable. 
The genus Micrastur, established by Mr. G. R. Gray in 1841+ 
* See P. Z. S. 1869, p. 129. 
} List of Genera of Birds, p. 6. 
