RAPTORES FALCONIDAE B. BOREALIS VAR. OALUEUS. 423 



Bill black; cere yellow ; legs and feet yellow. 



Irisbrowii ; cere greenish-yellow ; base, lower mandible, and edge along gape greenish-yellow ; legs 

 and feet yellow. 



Iris dark-brown ; cere greenish-yellow ; legs and feet yellow. 



BUTEO BOEEALIS (Gmel.), var. CALUEUS, Cassin. 



Western Red-tailed Hawk. 



Buteo calurus, CASS., Proc. Acad. Nat. Sci. Pbila., vii, 1855, 281. Id., Birds N. A., 1858, 

 22. BD., U. S. & Hex. Bouud. Surv., ii, pt. ii, 1859, Birds, 3. Id., P. K. R. 

 Rep., Beckwitb's Route, x, 1859, 11, pi. xiv. COUES, Proc. Acad. Nat. Sci. 

 Pbila., 1866, 44. COOPEB, Birds Cal., i, 1870, 471. STEV., U. S. Geol. 

 Surv. Terr., 1870, 462. YARROW, Rep. Orn. Specs., 1871, Wheeler's Exped., 

 1874, 36. 



