470 Mr. J. li. Gunicy's Notes on 



With reference to A. mexicanus, I find that the view held 

 by the naturalists above referred to, as to its identity with 

 A. cooperi, is also taken by Dr. Coues in his recent work on 

 the birds of North-western America ; the same author, at 

 p. 335 of that work, makes the following remarks in treating 

 of the differences between A. fuscus and A. cooperi : — " There 

 is also a difference in the feet, those of fuscus being much 

 slenderer, comparatively as well as absolutely, and relatively 

 longer.^' This tendency to an Asturine form of foot in A. 

 cooperi is more or less characteristic of tlie whole subgenus 

 Coop)erastur. 



Another American form, that very rare species^ A. col- 

 laris, is yet more remarkable in the robust character of its 

 tarsi and feet, and is perhaps not properly referable to any 

 other of the subgeneric forms into which the genus Accipiter, 

 as used by Mr. Sharpe, may be considered to be divisible, 

 being, in fact, very much sui generis. 



With regard to this species I have also to observe that the 

 description of it given by Mr. Sharpe, though headed " im- 

 mature," is apparently taken from the adult typical speci- 

 men in the British Museum, which was figured and described 

 at p. 148 of 'The Ibis' for 1860, pi. vi. 



A younger specimen, in the Norwich Museum, was also 

 briefly pescribed in the same notice, and a representation of 

 the upper portion of it introduced into the accompanying 

 plate. Referring my readers to this description, which will 

 be found at p. 149 of the volume above mentioned, I may 

 add that, although the chief part of the plumage of this spe- 

 cimen is immature, it is acquiring the adult dress by a moult 

 on the back and wings, thus showing the striking difference 

 between the brownish black hue which characterizes its upper 

 surface when adult, and the rich rufous tint which is con- 

 spicuous on that part of its plumage when immature, and 

 especially so on the wings and tail, though both the rectrices, 

 and also the quill-feathers of the wing, are transversely barred 

 with black; in the wing-feathers, however, the dark bars 

 appear only on the inner web, except in the case of the- ter- 

 * Conf. Ibis, 1874, p. .'521. 



