Vol. VI] SW'ARTH— RACES OF BEWICK WREN 85 



1910. Two heretofore unnamed wrens of the genus 

 Thryomanes. Univ. Calif. Publ. Zool., 5, pp. 

 307-309. 



1914. An account of the mammals and birds of the lower 

 Colorado Valley with especial reference to the 

 distributional problems presented. Univ. Calif. 

 Publ. Zool., 12, pp. 51-294, pis. 3-13, 9 text figs. 



Mailliard, J., with Grinnell, J. 



1905. Midwinter birds on the Mojave Desert. Condor, 

 7, pp. 71-77, 101-102. 



Oberholser, H. C. 



1898. A revision of the wrens of the genus Thryomanes 

 Sclater. Proc. U. S. Nat. Mus., 21, pp. 421-450. 



RiDGWAY, R. 



1904. The birds of North and Middle America. U. 

 S. Nat. Mus., Bull. 50, part 3, pp. xx-t-801, 

 19 pis. 



SWARTH, H. S. 



1914. The California forms of the genus Psaltriparus. 

 Auk, 31, pp. 499-526, pi. XL. 



