Vol. VI] SWARTH— RACES OF BEWICK WREN 85 



1910. Two heretofore unnamed wrens of the genus 

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

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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 

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RiDGWAY, R. 



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

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SwARTH, H. S, 



1914. The California forms of the genus Psaltriparus. 

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



