6 PACIFIC COAST AVIFAUNA. [No. 4 



in the mountains in any numbers. I think that I have seen more in 

 August than at any other time, but they are never very abundant unless 

 there is some carrion around on which they have been feeding. 



Circus hudsonius (Linnaeus). Marsh Hawk. 



Quite common in the early spring on the grass covered plains below 

 the mountains, occasionally venturing up into the foot hills. None were 

 seen later than April i. 



Accipiter velox rufilatus Ridgway. Western Sharp-shinned Hawk. 



A fairly common migrant, and as I have seen one or two at various 

 times through the summer months T presume that a few remain to breed. 

 They range over all parts of the mountains, from the foothills to the 

 summit of the highest peaks. 



Accipiter cooperi (Bonaparte). Cooper Hawk. 



Probably a resident, and fairly common though extremely wary ; for 

 continual warfare is waged between them and every poultry owner in 

 the mountains. There are one or two pair breeding in almost every 

 canyon, and as, when other game runs short, they make no scruples of 

 picking up a half grown chicken from under its owner's nose, it is only 

 by eternal vigilance that they are enabled to continue their career. I 

 think that this is the only species of hawk occurring in the mountains 

 that makes any depradations whatever upon the chicken yard. 



Accipiter atricapillus (Wilson). American Goshawk. 



On two occasions in April, 1903, I saw what I took to be a Goshawk 

 circling overhead at the top of the mountains. I have also seen in the 

 possession of one of the inhabitants of the mountains, a pair of wings 

 undoubtedly belonging to an individual of this species, which he had 

 shot. 



Buteo borealis calurus (Cassin). Western Red-tailed Hawk. 



Though not at all abundant a few pair breed in the higher parts of 

 the mountains, and the same birds can be seen day after day in about the 

 same locality. In 1902 a pair raised a brood near the head of the Miller 

 Canyon, and through the month of August I frequently saw the young 

 birds in the same locality. They were very tame and unsuspicious, and 

 on several occasions one lit on a tree under which I was resting, evi- 

 dently out of sheer curiosity. 



Buteo abbreviatus Cabanis. Zone-tailed Hawk. 



Not at all common. A pair were seen throughout the spring and 

 summer of 1902, but I doubt very much if they bred, as the two were 

 continually seen together up to September, when I left. A single bird 

 was several times seen in the same canyon during' the spring of 1903, 

 'and I have seen possibly half a dozen more in different parts of the 

 mountains. 



Buteo swainsoni Bonaparte. Swainson Hawk. 



A very abundant summer resident on the plains between the Hua- 

 chucas and the San Pedro River. Occasionally a bird ventures up into 

 the canyons, but I have never found any breeding in the mountains 

 proper. In the washes, half a mile or so below the mouths of the 

 canyons, where the trees begin to thin out and the country to become 

 more open, they nest commonly in the walnuts, sycamores and mes- 

 quites, the nests being seldom over thirty feet from the ground and 



