Vol. VI] SWARTH— RACES OF BEWICK WREN 75 



Canyon, 2; Los Angeles, 7; El Monte, 2. San Bernardino 

 County: San Bernardino Mountains, 5; Cajon Wash, 1; 

 Victorville, 5; Barstow, 1; Reche Canyon, 3. Riverside 

 County : Riverside, 5 ; San Jacinto Mountains, 28 ; Vallevista, 

 4; Palm Springs, 6; San Gorgonio Pass, 1. Orange County: 

 Santa Ana Canyon, 1. San Diego County: San Diego, I; 

 Witch Creek, 1 ; Cuyamaca Mountains, 2. Total, 252. 



Distinguishing characters — Coloration paler, less rufescent 

 dorsally than in any other form of Thryomanes from the main- 

 land of California, save eremophilus. In fresh fall plumage 

 adults of charienturus average close to Saccardo's umber, a 

 color about intermediate between the richer, more rufous', 

 raw umber of spilurus, and the grayer hair brown of eremo- 

 philus. In measurements charienturus differs from eremo- 

 philus in smaller size ; from spilurus, marinensis and drymoecus 

 in different proportions, usually having tail longer than wing, 

 whereas in the latter three forms the reverse is the case. 



Remarks — It is in the relative geographical positions ac- 

 corded to charienturus and drymoecus that the results of my 

 observations are most at variance with those of the writers 

 who have previously studied the group. Both Oberholser 

 (1898, p. 437) and Ridgway (1904, p. 563) define the habitat 

 of drymoecus as inclusive of the entire San Joaquin Valley, 

 and as extending westward to the coast in San Luis Obispo 

 County. As already stated under drymoecus, birds from the 

 central San Joaquin Valley are not typical of that form, being 

 rather of the nature of intergrades toward charienturus. Still 

 less are birds from the coast region of San Luis Obispo and 

 Santa Barbara counties to be regarded as representative of 

 drymoecus. Such divergence from the mode of charienturus 

 as they exhibit appears to be an approach toward spilurus, 

 whose territory they border. This, to my mind, is a satisfac- 

 tory explanation of the slightly more reddish coloration of 

 certain individuals, as well as of the variation in measure- 

 ments. 



Seventeen skins from San Benito County, 13 from Paicines 

 and four from Mulberry, most of them in fresh, unworn plum- 

 age, afford excellent comparative material from an interme- 

 diate locality, about at the meeting place of the ranges of 



