No. 2.] HOFFMAN ON THE BIRDS OF NEVADA. 243 



typical form only in being paler, and of an almost ashy color, wliicli 

 was doubtless the effect of the hot, dry climate of that region. 



Tinnunculus sparverius (Linn.) Vieill. — Sparrow Hawk. 

 . Is found generally abundant in the more favorable localities through- 

 out the upper portions of Nevada. 



Pandion haliaetus caroUnensis (Gmel.) Eidgw. — Fish Hawk; Osprey. 



The Fish Hawk was found only along the lower portion of the Truckee 

 River by Mr. Ridgway, where it was common in May. It is supposed 

 to breed in that locality. 



Circus hudsonius (Linn.) Vieill. — Marsh Hawk. 



Common in the marshy districts of the middle and western portions 

 of Kevada. 



Accipiter cooperi Bonap. — Cooper's Hawk. 

 Not uncommon. 



Accipiter fusGus (Gmel.), Bp. — Sharp-shinned Hawk. 



This miniature of A. cooperi was observed by Mr. Ridgway only in the 

 Upper Humboldt Valley, where it was common in September along the 

 streams flowing from the Glover Mountains. 



Buteo borealis calurus (Cass), Eidgw. — Western Red-tailed Hawk. 



A common species throughout the wooded valleys in winter, ascend- 

 ing to the more elevated timbered regions in summer. Mr. Eidgway, 

 in his list of specimens secured, mentions two individuals as melanotic, 

 one being "very black," the other "rufous-breasted." I have recently 

 examined a specimen of typical borealis captured in Pennsylvania, which 

 was a nearly perfect albino. There was a grayish streak from the eyes 

 backward so as to nearly unite upon the occiput, and the outer tail 

 feathers presented a pale brownish rufous tinge, with darker transverse 

 bars, which were barely perceptible upon the rest of the tail feathers. 

 Other feathers, upon the back and sides, upon close examination, pre- 

 sented dusky median markings, though at several paces distant these 

 became undistinguishable. 



Buteo swainsoni Bonap. — Swainson's Hawk. 



Frequently seen throughout the valleys, and appears to be more com- 

 mon during the autumn than the preceding — B. mlurvs. The only nest 

 with eggs observed was one near Antelope Creek, which was built near 

 another of Icterus bullochi. In this instance both were breeding, and 

 the latter evinced no fear of their neighbors, as one would occasionally 

 fly back and forth from the nest immediately over tliat occupied by the 

 hawk. Has also been obtained in the Colorado Valley from Fort Mo- 

 jave northward. 



