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. 



CALIFORNIA HAWK. Buteo Cooperii Cassin. A specimen 

 of this species was shot in 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 obaraotci'iotio of the Buteones of this continent, 

 and there seems to be not the slightest reason to question its 

 capture in Cambridge. 



ROUGH-LEGGED HAWK. BLACK 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 same 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 be 

 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. I have 



*In epist. Oct. 22, 1868. 



