518 NOTES ON SOME OF THE RARER BIRDS, ETC. 
among the "Resident Species," as it should have been, in my 
Catalogue. At Springfield, I have rarely observed it in 
winter; but I learn from Dr. Brewer, Mr. Maynard and 
others, that it is in some sections of the state a quite com- 
mon species at that season. 
CanrroRNIA Hawk. Buteo Cooperii Cassin. A specimen 
of this species was shot iu Fresh Pond woods, Cambridge, 
November 17, 1866, by Mr. William Brewster, of Cam- 
bridge, in whose collection it was detected a few months 
since by Mr. Maynard. It seems to be the first specimen 
yet reported from east of the Rocky Mountains. It is one 
of the most characteristic of the Buteones of this continent, 
and there seems to be not the slightest reason to question its 
capture in Cambridge. 
Roven-LEccED Hawk. Brack Hawk. .Archibuteo lago- 
pus Gray. (A. lagopus et Sancti-Johannis Auct.) Gener- 
ally not uncommon in winter in the Connecticut Valley. 
Dr. Wood is of the opinion that the Rough-legged Hawk 
and the Black Hawk are the same. “I have,” he says, “all 
shades of color from the light to the black, and I am unable 
to find the dividing line; both have the same measurements, 
the same claws and bill, the same habits, come and leave at 
the sume time, and hunt together. I have them almost 
black with the faint markings of the lighter bird, showing to 
my mind that the lighter markings become extinct as the 
black increases, or as the bird increases in age. Those who 
claim that they are distinct say that in some localities the 
 Rough-legs are common and no Black Hawks are to 
seen. This proves nothing. The young of the Red-throated 
Diver are very common in Long Island Sound, yet the adult 
is never seen there. So it is with the Crested Grebe; the 
young are found here in winter — never the adult.” * 
On another occasion, when writing on this point, Dr. Wood 
expressed his views still more strongly, as follows: “The 
Rough-legged Falcon and Black Hawk are the same. Ihave 
* In epist. Oct. 22, 1868, 




