LITERATURE CITED 1695 



1938. Life histories of North American birds of prey: Orders Falconiformes 

 and Strigiformes, pt. 2. U.S. Nat. Mus. Bull. 170. 



19-42. Life histories of North American flycatchers, larks, swallows, and 

 their allies: Order Passeriformes. U.S. Nat. Mus. Bull. 179. 



1943. My Aleutian holiday: A summer in forbidding seas. Bird-Life, 

 vol. 39, pp. 193-209. 



1955. Life histories of North American blackbirds, orioles, tanagers, and 



allies. U.S. Nat. Mus. Bull. 211. 

 Bequaert, Joseph C. 



1954. The Hippoboscidae or louse-flies (Diptera) of mammals and birds. 

 Pt. II. Taxonomy, evolution and revision of American genera 

 and species Ent. Americana, vol. 24, pp. 1-232. 

 Berger, Andrew J. 



1951a. The cowbird and certain host species in Michigan. Wilson Bull., 



vol. G3, pp. 26-34. 

 1951b. Ten consecutive nests of a song sparrow. Wilson Bull., vol. 63, 



pp. 186-188. 

 1953. Three cases of twin embryos in passerine birds. Condor, vol. 55, 

 pp. 157-158. 

 Bergman, Sten 



1935. Zur Kenntnis nordostasiatischer Vogel. 

 Bergtold, William Henry 



1913. A study of the house finch. Auk, vol. 30, pp. 40-73. 

 1916. Cassin's sparrow in Colorado. Auk, vol. 33, p. 435. 

 1917a. The birds of Denver. Wilson Bull., vol. 29, pp. 113-129. 

 1917b. A study of the incubation periods of birds. 



1926. Avian gonads and migration. Condor, vol. 28, pp. 114-120. 



1927. A house finch infected by fly larvae. Auk, vol. 44, pp. 106-107. 



1928. A guide to Colorado birds. 



1929. Egg weights from egg measurements. Auk, vol. 46, pp. 466-473. 

 Bernhoft-Osa, A. 



1956. Om en syngende hun av konglebit, Pinicola enucleaior. (Notes on a 



singing female pine-grosbeak.) Var Fagelvarld, vol. 15, pp. 245- 

 247. 

 Bernier, J. E. 



1909. Report on the Dominion Government Expedition to Arctic Islands 

 and the Hudson Strait on board the C.G.S. "Arctic." 

 Betts, Norman de Witt. 



1912. Notes from Boulder County, Colorado. Auk, vol. 29, pp. 399-400. 

 Bicknell, Eugene P. 



1880. Remarks on the nidifi cation of Loxia curvirostra americana, with a 

 description of its nest and eggs. Bull. Nuttall Ornith. Club, 

 vol. 5, pp. 7-11. 



1884. A study of the singing of our birds. Auk, vol. 1, pp. 328-329. 



1885. A study of the singing of our birds. Auk, vol. 2, 144-154. 

 Bigelow, Henry Bryant 



1902. Birds of the northeastern coast of Labrador. Auk, vol. 19, pp. 24-31. 

 Bird, C. G., and Bird, E. G. 



1941. The birds of north-east Greenland. Ibis, ser. 14, vol. 5, pp. 118-161. 

 Birtwell, Francis J. 



1901. Nesting habits of the evening grosbeak (Coccothraustes vespertinus) . 

 Auk, vol. 58, pp. 388-391. 



