Vol. VI] SWARTH— RACES OF BEWICK WREN 61 



and of slightly greater size. South of spilurus is charienturus 

 of the coast of southern California, a large sized, pale colored, 

 and long tailed race. There are two inland races of Thryo- 

 manes in California, drymoecus and eremophilus. Typical 

 drymoecus of the Sacramento Valley is of distinctly reddish 

 coloration, most nearly like, though paler than, marinensis and 

 spilurus, whose ranges it adjoins in places. Eremophilus is 

 a desert race, exhibiting an extreme of pale coloration, and 

 with relatively long tail. Of the insul^ir forms, nesophilus of 

 Santa Cruz and Santa Rosa islands, and catalince of Santa 

 Catalina Island, are but slightly different from the geograph- 

 ically adjacent charienturus. They are a trifle darker in color- 

 ation, and show certain differences in proportions. Leuco- 

 phrys, of San Clemente Island, is a short tailed race of dis- 

 tinctly pale coloration. 



As regards the coastal races, from calophonus through ma- 

 rinensis and spilurus to charienturus, the line of variation is 

 continuous, to be traced from one to another without a break. 

 In coloration, from the sooty calophonus to the pale charien- 

 turus, intergradation is perfect. The intermediate stages are 

 represented in marinensis and spilurus, the dividing lines be- 

 tween these several races being impossible of exact definition. 

 This gradual color change is nicely correlated with the cli- 

 matic variation of the region, from the extremely humid Puget 

 Sound district, with its somber hued calophonus, southward 

 through lessening degrees of humidity accompanied by corre- 

 sponding brightening of color in the birds. As regards size 

 and proportions, variation is also continuous. Calophonus is 

 of large size and with proportionately short tail. Southward, 

 as far as the Golden Gate, as shown hy- marinensis of Hum- 

 boldt and Marin counties, there is diminution in size. South 

 of this point spilurus shows slightly greater dimensions, and, 

 as illustrated by specimens from many intermediate stations, 

 there is steady increase in this regard southward through the 

 range of charienturus. Together with increased size south- 

 ward from the Golden Gate there is correlated a proportion- 

 ately greater length of tail. In calophonus, marinensis ahd 

 spilurus, the tail is shorter than the wing. Specimens collected 

 in the region of meeting of spilurus with charienturus have 

 tail and wing of about equal length, while in typical charien- 



