318 University of California Publications in Zoology. I Vol. 7 



LITERATURE CITED 



Grin NELL, J. 



1909. Birds and mammals of the 1907 Alexande* expedition to south- 

 eastern Alaska. The birds. Univ. Calif. Publ. Zool.. 5, 181- 

 244. 



Jenkins, H. O. 



1906. Variation in the hairy woodpecker (Dryobates villosus and sub- 

 species). Auk, 23, 161-171, 1 fig. (map) in text. 



Oberholser, H. C. 



1911. A revision of the forms of the hairy woodpecker {Dryobates 

 villosus [Linnaeus]). Proc. U. S. Nat. Mus., 40, 595-621, pi. 

 70 (map), 



SWARTH, H. S. 



1911, Birds and mammals of the 1909 Alexander Alaska expedition. 

 Univ. Calif. Publ. Zool., 7, 9-172, pis. 1-6, 3 figs, in text. 



