BlUnS — Diri'EONINAE — ARCIIIBUTEO SANCri-JOHANNlS. 



33 



This is one of the few North American birds which appear to be absolutely identical with a 

 species of Europe. lu both mhilt aiul young plumage, as described above, there are no cliar- 

 acters whatever, so far as wo can see, by which this bird can bo distinguished from A. lagopus 

 of Europe, and this identity is even more perfect in R[)eciinens from western Nortli America. 



We regard the plumage first described above as undoubtedly the adult of this specieSj though 

 it has never been given as such by any American author. It corresponds jirecisely, so far as we 

 can see, with specimens from Europe in that stage of plumage well understood to be the adult of 

 A. lagopus by all the German ornithologists, tliough apjiarently unknown to those of nioro 

 southern and western Europe, and is figured in their works above cited. The regarding of this 

 species as the young of A. sancti-joliannis, which has been done to some extent by American 

 naturalists, is assuredly erroneous. 



The figure in Audubon's plate, cited above, (B. of Am., pi. 422, fig. 2,) may be regarded as 

 very probably representing the adult of this bird, though so distorted in drawing and exagge- 

 rated in color as to be very difficult of recognition. Tlie best figure that we have seen of the 

 adult is that in Nauman's work, above cited. The young is well represented by various 

 authors, American and European^ as given above. 



List of specimens. 



ARCHIBUTEO SANCTI-JOHANNIS, G m e 1 i n . 



The Black Hawk. 



Falco sancii-johannis, Gm. Syst. Nat. I, p. 273, (1788.) 

 Faico spadiceus, Gm. Syst. Nat. I, p. 273, (1783.) 

 Falco nora-lerrm, Gm. Syst. Nat. I, p. 274, (1768.) 

 Falco ni^ec, WiLsox, Am. Orn. VI, p. 82, (1812.) 

 BuUo atcr, Vieill. Nouv. Diet. IV, p. 482, (181G.) 



Figures.— Wilson Am. Orn. VI, pi. 53, figs. 1,2; Aud. E. of Am. pi. 422, fig. 1 ; pi. 16G, (young.') 



Jldult. — Ejitire plumage glossy black in many specimens with a brown tinge ; forehead, throat, and large partially concealed 

 spot on occiput, white. Tail with one transverse well defined band of white, and irregularly marked towards the base with the 

 same color. Quills with their inner webs white, readily seen from below. Cere and toes yellow. Tarsi densely feathered in 

 front ; naked behind. Other specimens are entirely dark chocolate brown, with the head more or less striped vvitli yellowish 

 white and reddish yellow. Tail with several transverse bands of white, more or less imperfect and irregular. 



Young. — Tipper parts light umber brown, with the feathers more or less edged with dull white and reddish yellow. Abdomen 

 with a broad transverse band of brownish black ; other under parts pale yellowish white, with longitudinal stripes of brownish 

 black, frequently giving the predominating color on the breast aud sides ; wings and tail brown, tinged with cinereous, the 



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