CORVID.E — THE CROWS. 255 



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

 principal dillereiiee beiug iu the slender and more decurved and attenuated 



Picieorvus coluiilhinmis. 



bOl, with a slightly concave, instead of convex, cnlmeu, and plain instead 

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



Nucifraga cari/nraffirtFS. 



panying outlines of the generic features of the two. But one species is 

 known, this being peculiar to Western North America. 



j^.' Picicorvus coliimbianus, Bunai'. 



CLABKE'S CBOW. 



Corvus columbianus, Wii.sox, Am. Om. Ill, ISll, 29, pi. xx. —Bon. 01k. Wilson, 1S24, 

 No. 38. — Ib. SjTi. 1S28, 57. — Xi-TTALL, I, 1832, 218. Nucifraga cohimbiana, AiT). 

 Oni. Biog. IV, 1838, 4.59, pi. coolxii. — In. Syn. 1839, 156. — Ib. Birds Am. IV, 1842, 

 127, pi. ccxxxv. — Bon. List, 1838. — Nutt.vli., Man. I, (2il. «!.,) 251. Picicorvm co- 

 lumbianus, BoxAP. Consp. 1850, 384. — Nv;wbkuuy, P. R. K. Rep. VI, iv, 1837, 83. 

 — Raiiid, Birds N. Am. 1858, 573. — Loun, Rr. R. A. Inst, iv, 121 (British Colum- 

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

 289. " Corviis mcgonyx, 'W KGi.E,9.." 



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