418 



ZOOLOGY— BIEDS. 



little falcon is found in their midst, and selecting his victims as whim or 

 appetite urges. They often choose the Turtle Doves, and, swooping down 

 in the midst of a flock gathered about a pool of water, almost invariably con- 

 trive to seize one of the bewildered birds ere the surprise caused by the sud- 

 denness of the attack is over. Occasionally, however, the first swoop is 

 unsuccessful, and then they usually return to some perch near by to await 

 another opportunity ; but, when urged by hunger, I have seen a hawk, having 

 failed in his swoop, turn, with the quickness of thought, and pursue one of 

 the flying birds ; unless there should chance to be some thick covert hard 

 by into which the timid quarry darts and conceals itself, the race is usually 

 a short one, and terminates by the hawk bearing away his struggling victim 

 to some perch where at leisure he picks and devours his prize. 



No. 



Sex. 



<? ad. 



9 ad. 

 9jun. 

 9jun. 

 cJjun. 

 <4jun. 

 9 ad. 



Locality. 



Date. 



Collector. 



Wing. 



Tail. 



Bill. 



Tarsus. 



284 



3°i 



47^ 



35 



S67 



875 

 914 



Beaver Creek, Utah... 

 . do 



Sept. 24, 1S72 

 ... do 



Dr. I I.C. Yarrow and 



H. W. Henshaw. 

 do 



















Provo, Utah 



Nov. 30, 1S72 

 May 9, 1S73 

 Sept. 24,iS73 

 Sept. 27, 1S73 

 Oct. 16, 1S73 



do 













do 



do 



7.70 

 6.88 

 6. So 

 8. 10 



6.75 

 5-7^ 

 5.90 

 6.60 



0. 50 

 0.40 

 0.40 

 °-53 



2.00 

 1.90 

 1. So 

 2.17 



Camp Grant, Ariz 



do 





do 





NISUS COOPEKI (Bon.). 

 Cooper's Hawk. 



Falco cooperi, Bon., Am. Orn., pi. x, f. 1, 1825. 



Astur cooperi, Newb., P. B. B. Rep., vi, 1857, 74. 



Accipiter cooperi, Bd., Birds N. A., 1858, 1C. — Id., U. S. & Mex. Bound. Surv., ii, pt. 

 ii, 1859, Birds, 3. — Oeekm., P. B. B, Bep., x, pt. iv, 1859, 33. — HENRY, 

 Proc, Acad. Nat, Sci. Phila,, 1859, 104 (New Mexico).— Coop. & Suckl., 

 P. B. B, Bep., xii, pt. ii, 18G0, 145.— Coues, Proc. Acad. Nat, Sci. Pliila., 

 18CG, 43.— /</., ib., 18(58, S2.— Cooper, Birds Cat., i, 1870, 4(i4.— Snow, 

 Birds Kan., 1872, 3.— Coues, Key N. A. Birds, 1872, 212, f. 140.— Allen, 

 Proc. Bost. Soc. Nat. Hist., June, 1874, 34.— Coues, Birds Northwest, 1874, 

 334. 



Accipiter mexicanus, Henry, Proc. Acad. Nat. Sci. Phila,, 1854, 104 (New Mexico). — 

 Bd., Birds N. A., 1858, 17.— Xantus, Proc. Acad. Nat. Sci. Phila,, 1859, 190 

 (Port Tejou, Cal.).— Hayd., Trans. Am. Phil. Soc, xii, 1S62, 152.— Coop. 

 & Suckl., P. B, B. Bep., xii, pt. ii, 1800, 140. — Cooper, Birds Cal., i, 1870, 

 405.— STEV., U. S. Geol. Surv. Terr., 1870, 402. 



