258 Mr. J. H. Gurney on some Hawks of the 



And since by this line of reasoning we are able to deter- 

 mine conclusively^ as it seems to me, the type species of the 

 genus Picus, it is quite unnecessary to employ the method 

 by which Mr. Sharpe divides the genus Strix (Ibis, 1875, 

 p. 324/), useful though that method is when the type cannot 

 be ascertained at all. If we were to reason in the present 

 instance as Mr. Sharpe might, we should conclude that Picus 

 viridis was the typical species, and that Dendrocopus martius 

 was the proper name for the Black Woodpecker — a view 

 from which I must entirely dissent. 



XXL — Notes on some Hawks of the Subgenera Cooperastur 

 and Urospizias. By John Hbnry Gurney. 



(Plate VIII.) 



Accipiter, or, to speak more exactly, Cooperastur poliogaster 

 (Temm.), has been for many years only known by the type 

 specimen at Ley den. It has now ceased to be unique, as a 

 second specimen, said to be from the Amazons valley, has 

 been acquired by Messrs. Salvin and Godman, who have very 

 kindly permitted me to examine it. It is an adult bird; and 

 the following are its measurements compared with those of 

 the type specimen in the Ley den Museum, the latter being 

 taken from Mr. Sharpe's Catalogue, vol. i. p. 121. 



An inspection of this specimen convinces me that Bona- 

 parte was quite right in assigning this species to his sub- 

 genus Cooperastur"^, it being a typical species of that section 

 of the subgenus in which the underparts are immaculate, and 

 which includes C. jjileatus and C. bicolor, and is designated 



* Vide Rev. et Mag. de Zool. 1854, p. 538. 



