Vol. VI] SWARTH— RACES OF BEWICK WREN 



69 



ena, 1. Siskiyou County: Callahan, 2. Shasta County: 

 Baird, 1. Tehama County: Tehama, 5; Tuscan Springs, 1. 

 Glenn County: Winslow, 1. Colusa County: Stony Ford, 

 2. Butte County: Chico, 3; Oroville, 2. Sutter County: 

 West Butte, 2; Sutter, 5. Yolo County: Grand Island, 1 ; 

 Rumsey, 3. Solano County : Vacaville, 11. Amador County : 

 Carbondale, 2. Nevada County: Cherokee, 4; Montezuma 

 Hill, 2. Placer County: Blue Canyon, 1. Inyo County: 

 Carroll Creek (east slope of the Sierras), 4. Fresno County: 

 Lane Bridge, 1. Madera County: Raymond, 2. Stanislaus 

 County: Modesto, 7. Mendocino County: Mount Sanhe- 

 drin, 1. Contra Costa County : Walnut Creek, 8 ; Mount Dia- 

 blo, 6. Santa Clara County : Palo Alto, 1. Total number of 

 specimens, 82. 



Distinguishing characters— Com^2.Yed with charienturus, 

 drymoecus has the upper surface darker and more rufescent. 

 The tail is somewhat shorter, and in different proportion to the 

 wing. In charienturus the tail is slightly longer than the wing, 

 in drymoecus slightly shorter. Compared with spilurus, the 

 upper surface of drymoecus is a duller and less rich brown. 

 In the Juvenal plumage the character of intensity of rufescence 

 of the upper surface is also apparent, young of drymoecus be- 

 ing less deeply colored than young of spilurus and marinensis 

 on the one hand, and somewhat darker (though slightly so) 

 than the young of charienturus on the other. It is noteworthy 

 in this regard that whereas in typical drymoecus (Sacramento 

 Valley birds) the adults approach spilurus more nearly than 

 they do charienturus, the juvenal plumage is but slightly dif- 

 ferent from the same stage in charienturus. 



Remarks— Oi the available material of this form, the 

 greater part consists of summer adults in rather worn plumage, 

 with a good proportion of juvenals. There is a lack of birds 

 in fresh fall plumage. 



Thryomanes bewicki drymoecus is a composite race, and 

 one probably not subject to exact definition. It diflfers from 

 all the other California forms of Thryomanes in the nature of 

 its geographical position, being centrally placed and apparently 

 intergrading with each of the surrounding races at the va- 

 rious points of contact. Consequently birds from different re- 



