CORVID^ — THE CROWS. 



255 



This genus is so similar to Nucifraga as to be hardly separable ; the 

 principal difference being in the slender and more decurved and attenuated 



Picicorvus coliimbianus . 



bill, with a slightly concave, instead of convex, culmen, and plain instead 

 of spotted plumage. The difierences of form are expressed by the accom- 



96T3 



Nurifrnga azryocatactes. 



panying outlines of the generic features of the two, 

 known, this being peculiar to Western North America. 



But one species is 



Picicorvus columbianus, Bonap. 



CLARKE'S CROW. 



Corvus columbiamos, Wilson, Am. Orn. Ill, 1811, 29, pi. xx. — Bon. Ob.s. Wilson, 1824 

 No. 38. — Ib. Syn. 1828, 57. — Nuttall, I, 1832, 218. Nucifraga cohtmbicma, AuD, 

 Orn. Biog. IV, 1838, 459, pi. ccclxii. — Ib. Syn. 1839, 156. — Ib. Birds Am. IV, 1842^ 

 127, pi. ccxxxv. — Bon. List, 1838. — Nuttall, Man. I, (2d. ed.,) 251. Picicorvtis co 

 lumbianus, Bonap. Consp. 1850, 384. — Newberry, P. B. R. Rep. VI, iv, 1837, 83 

 — Baird, Birds N. Am. 1858, 573. —Lord, Pr. R. A. In.st. iv, 121 (British Colnm 

 bia). — Dall & Bannlster, Tr. Chic. Ac. I, 1869, 286. — Cooper, Orn. Cal. I, 1870, 

 289. " Corvus mcgonyx, Wagler." 



