BLACK HAWK. 75 
in plumage, yet in all their characteristic features they strikingly 
resemble each other. The Chocolate-colored Falcon of Pennant, and 
St. John's Falcon of the same author (Arct. Zool. No. 93 and 94), are 
doubtless varieties of this ; and very probably his Rough-legged Falcon 
also. His figures, however, are bad, and ill calculated to exhibit the 
true form and appearance of the bird. 
This species is a native of North America alone. We have no 
account of its ever having been seen in any part of Europe ; nor have 
we any account of its place, or manner of breeding. 
BLACK YLk^NK.—{VARIETY^) 
[Plate LIII. Fig. 2.] 
This is probably a younger bird of the preceding species, being, 
though a male, somewhat less than its companion. Both Avere killed 
in the same meadow, at the same place and time. In form, features, 
and habitudes, it exactly agreed with the former. 
This bird measures twenty inches in length, and in extent four feet ; 
the eyes, bill, cere, toes, and claws, were as in the preceding ; head 
above white, streaked with black and light brown ; along the eyebrows 
a black line ; cheeks streaked like the head ; neck streaked Avith black 
and reddish brown, on a pale yellowish white ground ; whole upper 
parts brown black, dashed with brownish white and pale ferruginous ; 
tail white for half its length, ending in brown, marked with one or two 
bars of dusky, and a large bar of black, and tipped with dull white ; 
wings as in the preceding, their lining variegated with black, white and 
ferruginous ; throat and breast brownish yellow, dashed with black ; 
belly beautifully variegated with spots of white, black and pale ferru- 
ginous ; femorals and feathered legs the same, but rather darker ; vent 
plain brownish white. 
The original color of these birds, in their young state, may probably 
be pale brown, as the present individual seemed to be changing to a 
darker color on the neck and sides of the head. This change, from 
pale brown to black, is not greater than some of the genus are actually 
known to undergo. One great advantage of examining living, or newly 
killed specimens, is, that whatever may be the difference of color 
between any two, the eye, countenance, and form of the head, instantly 
betray the common family to which they belong ; for this family like- 
* As Wilson supposed, this is the young of the preceding sjiecies. 
