Yoel kid Ua ald ig Fas 
THIRD SERIES. 
No. XXI. JANUARY 1876. 
I.—Second Thoughts on the Genus Micrastur. By Rozerrt 
Ripeway, of the Ornithological Department, U.S. National 
Museum, Washington. 
Havine recently examined the entire series of the smaller 
members of this genus contained in the collection of Messrs. 
Salvin and Godman, sent to me for that purpose, I have been 
induced to modify to some extent my views given in the 
‘Proceedings’ of the Boston Society of Natural History for 
1873. 
The series is a splendid one, and has, I think, enabled me 
to get the right idea of the species of this exceedingly per- 
plexing group. 
Setting MW. melanoleucus (sive “ semitorquatus’’) and M. 
mirandoitit aside, as being distinct enough to need no notice 
in connexion with the smaller species, I identify the names 
of previous authors as follows :— 
Sparvius ruficollis, Vieill., = M. ruficollis, Scl. & Salvy., rufous 
phase, adult. 
Sparvius gilvicollis, Vieill.*,=M. leucauchen, Scl. & Salv., 
* This cannot, according to the terms of the diagnosis, be M. gil- 
collis, Scl. & Saly., if the latter = my concentricus, which = concentricus of 
SER. I1I.—VOL. VI. B 

