424 



ZOOLOGY BIRDS. 



Jjuteo boreal in var. calums, BD., BREW., & RIDG., N. A. Birds, iii, 1874, 280. YARROW 

 & HENSIIAW, Rep. Orn. Specs., 1872, Wheeler's Exped., 1874, 25. HEN- 

 SHAW, Rep. Orn. Specs., 1873, Wheeler's Exped., 1874, 91, 140. COUES, 

 Birds Northwest, 1874, 353. 



Pcevilopternisboreatis, HENRY, Proc. Acad. Nat. Sci. Phila., 1859, 105 (New Mexico). 



Butco monlanus, NEWB., P. R. R. Rep., vi, 1857, 75. BD., P. R. R. Rep., Berkwith's 

 Route, x, 1859, 12. XANTUS, Proc. Acad. Nat. Sci. Phila., 1859, 190 (Fort 

 Tejon, Cal.). HEERM., P. R. R. Rep., x, pt. ii, 1859, 32. KENNERLY, P. R. 

 R. Rep., W hippie's Route, x, 1859, 19. BD., U. S. & Alex. Bound. Surv., ii, pt. 

 ii, 1859, Birds, 3. COOP. & SUCKL., P. R. R. Rep., xii, pt. ii, 1800, 147. 

 COUES, Proc. Acad. Nat. Sci. Phila., 1806, 43. COOPER, Birds Cal., i, 1870, 

 409. STEV., U. S. Geol. Surv. Terr.. 1870, 4(52. SNOW, Birds Kan., 1872, 

 4. MEBRIAM, U. S. Geol. Surv. Terr., 1872, 097. 



The Red-tailed Hawk is an abundant resident through the West, con- 

 fining itself in summer to the mountains, and becoming more or less abun- 

 dant in the lowlands as winter approaches. The dark type of this bird 

 seems to be very numerous in Arizona; individuals varying from the light 

 form known as montanus to the dark fuliginous condition characterized 

 under the name calurus, the last condition being represented in perhaps one- 

 third of the number seen. The two forms occur together; and on one 

 occasion, at least, I noticed a pair of the birds, evidently mates, in which the 

 difference in coloration was striking, and visible at a long distance. At 

 Mount Graham, in October, these hawks were present in large numbers, 

 and tamer than I ever have known hawks to be elsewhere. Walking quietly 

 along, there was no difficulty in approaching within a few yards of the tree 

 where one chanced to perch. One individual which I scared from its perch 

 by throwing a stone, took a few broad circles about me, as though wonder- 

 ing what it meant, and then quietly returned to his former stand. 



