PROCEEDINGS 



OF THE 



CALIFORNIA ACADEMY OF SCIENCES 



Fourth Series 



Vol. VI, No. 4. pp. 53-85, pi. 2. May 8, 1916 



IV 



THE PACIFIC COAST RACES OF THE BEWICK 

 WREN^ 



BY 



Harry S. Swarth 



INTRODUCTION 



The material upon which these observations are based is 

 mainly from the collection of the California Museum of Verte- 

 brate Zoology. Besides the Museum collection proper there 

 are on deposit in that institution the Grinnell, Morcom and 

 Swarth collections. The total aggregation of skins of Thry- 

 omanes hewicki in that Museum numbers 425 specimens. 

 There was also available material in the Los Angeles Museum 

 of History, Science and Art, including the collections of 

 Messrs. Daggett, Law, Lamb, Richardson, and Willett, in all 

 109 specimens. To Messrs. Joseph Mailliard and John W. 

 Mailliard the writer is under obligations for the loan of 52 

 skins, including splendid series of marinensis, and series of 

 drymoecus and charientunis from regions not otherwise rep- 

 resented. From Mr. A. B. Howell 11 skins were borrowed, 

 illustrating special points. Altogether, a total of 597 examples 

 of the Pacific coast forms of Thryomanes hewicki were ex- 

 amined in the preparation of this paper. To the institutions 



'Contribution from the University of California Museum of Vertebrate Zoology. 



May 8, 1916 



