538 Birds of Colorado 
97 Cooxr, W. W. The Birds of Colorado. Bull. No. 37, State 
Agricultural College, Fort Collins, 1897, pp. 1-144. Further 
Notes, Bull. No. 44, 1898, pp. 145-176. Second Appendix, Bull. 
No. 56, 1900, pp. 177-240. The most complete list of the Birds 
of Colorado, with bibliography and distribution.” Supplement 
published in the Auk, 1909, pp. 400, should also be consulted. 
97a Cooxz, W. W. Bendire’s Thrasher in Colorado. Osprey, u., 
1897, p. 7. 
97b CooxE, W. W. The Scarlet Ibis in Colorado. Auk, xtv., 1897, 
p. 316. A second record, made through misapprehension, 
subsequently corrected. 
97¢ CooxzE, W. W. A New Bird for Colorado. Oregon Naturalist, 
Iv., 1897-8, p. 65. Stellula calliope at Colorado Springs. 
98 Cooxr, W. W. A New Bird for Colorado (Ammodramus lecontet). 
Osprey, 111., 1898, p. 13. Also notes on Slate-coloured Sparrow, 
Mocking-bird and Bobolink. 
98 Cooxz, W. W. The Scarlet Ibis—A Correction—Auk, xv., 1898, 
p. 183. The record really referred to the White-faced Glossy Ibis. 
99 Cooxzn, W. W. More New Birds for Colorado. Auk, xv1., 1899, 
p. 187, ic. Astragalinus p. mexicanus, Branta v. minima and 
Junco montanus. 
04 Cooxzr, W. W. Distribution and Migration of North American 
Warblers. Bull. No. 18, Biol. Survey, U.S. Dept. Agricul- 
ture. Washington, 1904. 8vo. 
06 CooxrE, W. W. Distribution and Migration of North American 
Ducks, Geese and Swans. Bull. No. 26, Biol. Survey, U.S. 
Dept. Agriculture. Washington, 1906, 8vo. 
09 Cooxr, W. W. Some New Birds for Colorado. Auk, xxv1., 
1909, p. 314, ie. Sterna hirundo, Butorides virescens, Spizella 
pusilla arenacea and Helminthophila chrysoptera. 
09 Cooxz, W. W.' The Birds of Colorado—Third Supplement. Auk, 
XXVI., 1909, pp. 400-422. A supplement to the former work, 
“* Cooke 97,” bringing the literature and records up to date. 
73 Cours, E. Range of the Geococcyx californianus. Amer. Nat., 
vi., 1873, p. 751. Occurrence at Fort Lyon noted. 
74 Covzs, E. Birds of the North-west. Miscell. Publ., No. 3, U.S. 
Geological Survey of the Territories. F. V. Hayden, US. 
Geologist in charge. Washington, 1874, 4to. Contains valuable 
original notes by Trippe, q.v. on birds observed near Idaho 
Springs. 
76 Cours, E. On the Breeding Habits, Nest and Eggs of the White- 
tailed Ptarmigan: (L. leucurus). Bull. U.S. Geol. Surv. Terr., 
2nd ser. Vol. 1., No. 5, p. 263, 1876. 
