Voi,. VI] SWARTH— RACES OF BEWICK WREN 83 



eremophilus differ from the mode of that subspecies, so do they 

 approach charienturus or drymoecus. 



There is a specimen of the Desert Wren at hand collected 

 in the Piute Mountains, Kern County, September 6, 1903. As 

 noted previously in this paper, under charienturus, examples 

 of the latter race were taken in winter in the same mountain 

 range; and circumstances make it appear that charienturus is 

 the resident form. With little doubt eremophilus is but a 

 migrant br winter visitant at this point. There is at hand an- 

 other example of this subspecies from Palm Springs, Riverside 

 County, taken December 30, 1903. The Desert Wren thus 

 ranges in winter over the breadth of the Colorado Desert, and 

 probably over the Mohave Desert as well, but it evidently is 

 rare at the western borders of these tracts. Considerable win- 

 ter collecting at points on the Mohave River, as at Victorville 

 and Yermo, has failed to disclose its presence there, and the 

 one specimen from Palm Springs is the only example recorded 

 from the latter station. Apparently the bottom lands of the 

 Colorado River form the main winter home of the species 

 in this region. 



The series of skins from southeastern Arizona contains an 

 excellent representation of both adults and juvenals, taken at 

 all seasons of the year. The individuals of this series, al- 

 though true in the main to the characteristics of the race, ex- 

 hibit a certain amount of variation, apparently to be explained 

 only as due to individual peculiarities. This is true of both 

 adults and juvenals. As having bearing upon the extremes 

 of variation encountered, mention might be made of the re- 

 corded occurrence of drymoecus at Calabasas, southern Ari- 

 zona (Oberholser, 1898, p. 438). In the series before me 

 there is a single individual taken in the Chiricahua Mountains, 

 Arizona, October 27, 1914 (no. 2538, coll. of J. E. Law), 

 that might be considered as belonging in the same category. 

 This last mentioned bird is short tailed and rather dark col- 

 ored, being not unlike certain examples of drymoecus in ap- 

 pearance, while it is even darker colored than selected speci- 

 mens of charienturus. While this specimen in certain respects 

 thus bears a casual resemblance to some California birds rather 

 than to typical eremophilus, I cannot believe that it belongs 

 to the race drymoecus, in the sense that this is an individual 



