506 University of California Publications in Zoology — [Vou. 17 
uted. Especially towards the south is its range very ‘‘spotty,’’ the 
representations on detached mountain tops being wholly isolated. 
Two main areas of relatively continuous distribution are, however, 
pereeivable—the Rocky Mountain area; and the Sierra Nevada area. 
Close scrutiny of the series of specimens at hand well representing 
the entire Rocky Mountain area reveals no variation in phylogenetic 
characters from the northernmost to the southernmost stations. All 
show in apparently equal degree the long tail and cinnamon tinge of 
sides and back, these features together constituting the grounds for 
separate subspecifie recognition of a Rocky Mountain form. On the 
other hand, the Sierra Nevadan center, with its own recognizable race, 
a~ 
Penthestes gambeli inyoensis | 
Penthestes gambeli abbreviatus 
Penthestes gambeli baileyae 
Solid symbols, specimens examined 
Hollow symbols, published records Bl 
Breeding ranges outlined ] 
DISTRIBUTION MAP 
} MUSEUM OF VERTEBRATE ZOOLOGY 
UNIVERSITY OP CALIFORNIA, 
Fig. 1. Map showing distribution of the races of the Mountain Chickadee in 
California. 
