340 Mr. J. H. Gurney's Notes on 



terrupted band of dark plumbeous across its middle portion ;" 

 and they likewise refer to the same species a specimen in the 

 collection of the Boston Society, respecting which they remark 

 that '' it has the bands on the tail more consincuous than the 

 last-named example, and agrees with R. tceniurus of Cassiu/' 



Not having seen either of the above-mentioned specimens, 

 nor yet the type specimen of R. taeniurus, I am unable to 

 offer an opinion as to whether they are, or are not, distinct 

 from the true R. hamatus ; but Mr. Sharpe's descrij)tion of 

 the type specimen of R. taniurus appears to indicate a distinct 

 species. 



With the kind assistance of Mr. Salvin I have drawn up 

 the following list of synonyms of the different species of 

 Rostrhamus, from which I have omitted all such citations as 

 appear to me to be of too doubtful a character to admit of 

 satisfactory identification ; the order in which the species are 

 arranged accords, as far as possible, with that adopted by 

 Mr. Sharpe : — 



1. Rostrhamus hamatus. 



Falco hamatus, Temm. ex Illiger, PI. Col. i. pi. 61, and 

 probably pi. 231 (1823). 



Buteo hamatus, Bonn, et Vieill. Enc. Meth. iii. p. 1223 

 (1823). 



"^Ibyder sociaUlis, Schl. Mus. P. B. Pohjbori, p. 7 (1862). 



Ibijder sociabilis, Schl. Revue, p. 138 (1873). 



"^Rostrhamus hamatus, Baird, Brewer, and Ridgway, Birds 

 of North America, iii. p. 209 (1874). 



^Rosthramus sociabilis, Sharpe, Cat. Accipitres, p. 327 



(1874). 



[The citations marked with an asterisk in the foregoing 

 list refer wholly or in part to specimens showing transverse 

 bars upon the tail, which may possibly prove to be specifically 

 distinct.] 



2. Rostrhamus t^niurus. 



Rostrhamus tceniurus. Cab. J. f. O. 1854, p. 80. 

 R. tceniurus, Scl. & Salv. Nomcncl. p. 121 (1873), 



