582 OENlTnOLOGT. 



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

 flowing from the Clover Mountains. The specimen obtained had been 

 chasing a small bird through a very dense thicket, but losing siglit of the 

 fugitive, alighted upon a twig within a few feet of us. 

 List of specimens. 

 917, 9jin:,- Upper' Humboldt Valley (Camp 24), September 10, 18C8. 13|— 

 24,f— (?)— eg. Bill, black, growing gradually pale bluisU basally ; cere and angle of the 

 inoutli, yellowish-green ; iris, sulphur-yellow ; tarsi and toes, rich lemon-yellow; claws, 

 jot-black. 



BUTEO LINEATUS. 

 Ked-slioiildcrcd Hawk. 



/?. dcfjans — Red-breasted HaivJc. 



Buteo elegans, Cassin, Pr. Ac. Nat. Sci. Philad., 1855, 281 ; Baird's B. N. Am., 

 1858, 28.— Baird, Cat. N. Am. B., 1859, No. 25.— Cooper, Orn. Cal., 1, 1870, 

 477. 



Buteo lineatus var. elegans, lliDGWAY, in Coue.s' Check List, 1873, No. 352a; iu 

 B. B. & II., Hist. N. Am. B., Ill, 1874, 277. 



Buteo lineatus, CouES, Key, 1872, 21G (part). 



This handsome Hawk was seen only in the Sacramento Valley, where 

 it was rather common among the trees near the river. 



Buteo borealis/ 



Kcd-lailod Hawk. 



/?. cahirus — Baslij Red-tail. 



Buteo cahirus, Cassin, Pr. Ac. Nat. Sci. Philad., 1855, 281 ; Baird's Birds N. Am., 

 1858, 22.— Baird, Cat. N. Am. B., 1859, No. 20.— Cooper, Orn. Cal., I, 1870, 

 471. 



Buteo horealis var. cahirus, Ridgway, iu Coues' Check List, 1873, No. 351a; iu 

 B. B. & K., Hist. N. Am. B., Ill, 1874, 236.— Henshaw, 1875, 423. 



Buteo borealis. b. ealurus, CouES, B. N.W., 1874, 352. 



Buteo montanus, CASSIN, Pr. Ac. Nat. Sci. Philad., 1856, 39; Baird's B. N. Am., 



1858, 26 (not of NuTTALL, 18-^0,= B. sicainsoni J.— Baird, Cat. N. Am. B., 



1859, No. 24.— Cooper, Orn. Cal., I, 1870, 469. 



The Red-tailed Hawk was a very common species in all wooded local- 

 ities of the Interior. It was especially abundant during the winter among 



' Other western races of this Hawk are y. lucasanus, Ridgw., of Cape St. Lucas, 

 and S. kridcri, EIooPES, of the Great Plains, from Minnesota to Texas. B. harlani, 

 AuD., and B. cooperi, Cass., are allied but ai)parently distinct species. 



