546 Birds of Colorado 



96 Nash, H. W. American Rough-legged Hawk, with photograph. 



Nidol., IV., 1896, p. 15. 



97 Nash, H. W. Nest and Eggs of the Arkansas Goldfinch. Nidol., 



rv., 1897, p. 29, with photograph. 

 90 Nixon, J. P. A series of Eggs of the Rock-Wren. Orn. and Ool., 



XV., 1890, p. 21. 

 88 NoBKis, J. P. A Series of Eggs of Sitta pygmoea. Cm. and Ool., 



xra., 1888, p. 173. 

 02 Obebholser, H. C. A Review of the Larks of the Genus Otocorit. 



Proc. U.S. Nat. Mus., xxrv., 1902, pp. 801-884, pis. 45-45, 



and 4 maps. 



04 Obebholseb, H. C. A Revision of the American Great Homed 



Owls. Proc. U.S. Nat. Mus., xxvii., 1904, pp. 177-192. The 

 Colorado subspecies referred to Aaio magellanicus occidentalis. 



05 Obebholseb H. C. The Forms of Vermivora celata. Auk, xxn., 



1905, p. 242. Description of Vermivora (= Helminthophila) 

 celata oreatera, the Rocky Mountain Region form of the Orange- 

 crowned Warbler. 



06 Obebholseb, H. C. The North American Eagles and their 



Economic Relations. Bull. No. 27, Biol. Surv. U.S. Dept. Agric. 

 pp. 1-31. Washington, 1906. 



07 Obebholseb, H. C. A New Agelaius from Canada. Auk, xxrv., 



1907, pp. 332-336. Agelaius p. arctolegus and A. p. fortia occur 

 in Colorado. 



90 OsBUBN, W. Nesting of the Grebes {Podilynibua podicepa). 

 Om. and Ool., xv., 1890, p. 68. 



93 OsBUBN, W. Birds of Rare Occurrence in Northern Colorado. 

 Science, xxii., 1893, p. 212. Zonotrichia coronata first recorded. 



01 Osgood, W. H. New subspecies of North American Birds. Auk, 

 xviii., 1901, pp. 179-185. The White-tailed Ptarmigan of 

 Colorado, separated as a distinct subspecies (Lagopua leucurus 

 altipetens). 



86 Peaece, G. D. Water Ousel or American Dipper. Sunny South, 

 Ool., I., 1886, p. 8. 



10 Pike, Z. M. An Account of Expeditions to the Sources of the 

 Mississippi, and through the Western Parts of Louisiana to 

 the Sources of the Arkansaw, Kans, La Platte and Pierre Juan 

 Rivers, performed by order of the Government of the United 

 States dvu-ing the years 1805, 1806, and 1807, etc., etc. Phila- 

 delphia, 1810, 8vo. The portion relating to Colorado contains 

 allusions to the Pheasant (i.e. Dusky Grouse), Turkey, Raven, 

 Magpie, and Carolina Parrot. Coues' edition, published in 

 New York, in 3 vols., in 1895, is quoted in the records for these 

 species. 



