The Birds of El Paso County, Ojloeado 473 



Further Notes on the Birds of Colorado. Bull. No. 

 4, 1898, pp. 145-176. 



The Birds of Colorado. Second Appendix to Bulletin 

 No. Z7. Bull. No. 56, 1900, pp. 177-239. The most com- 

 plete list of Colorado birds up to time of publication, and 

 containing many El Paso County records. 



Cooke, W. W. A New Bird for Colorado. Oregon Natural- 

 ist, IV, 1897-8, p. 165. Stellula calliope taken at Colorado 

 Springs. 



Felger, a. H. The Prothonotary Warbler in Colorado. Auk, 

 XXIV, 1907, p. 342; also Condor, IX, 1907, p. 110. Re- 

 ports capture of three specimens by B. G. Voight, one of 

 which was taken between Palmer Lake and Monument. 



Henshaw, H. W. Report upon Ornithological Specimens 

 collected in the Years 1871, 1872 and 1873, in Geograph- 

 ical and Geological Explorations and Surveys West of the 

 One Hundredth Meridian. First Lieutenant George M. 

 Wheeler, Corps of Engineers, in charge. Washington, 

 1874. Pp. 133-507, pis. I-XV. Some El Paso County 

 notes by Aiken and Henshaw. 



Keyser, L. S. Birds of the Rockies. Chicago, 1902. 8vo. 

 A popular work and containing some El Paso County 

 notes. 



Miller, O. T. A Bird Lover in the West. Boston and New 

 York, 1894. 16mo. Popular book ; contains observations 

 made near Colorado Springs. 



Minot, H. D. Notes on Colorado Birds. Bull. Nutt. Orn. 

 Club, V, 1880, pp. 181-2, and 223-232. Contains notes 

 made near Manitou and Seven Lakes. 



Oberholser, H. C. The North American Forms of Astra- 

 galinus psaltria (Sag). Proc. Biol. Soc. Wash., XVI, 

 pp. 113-116, September 30, 1903. Reviews status of A. p. 

 psaltria, A. p. arisona, and A. p. mexicanus, concludes 

 variations in color are due to age, and cites a series of 

 specimens taken at Colorado Springs in the breeding sea- 

 son and containing all three forms. 



