224 JJniversiiij of California Puhlications in Zoology. [Vol. 7 



Quiiin River Crossing (on the fiat) are slightly smaller than 

 those measured by Allen (1890, p. 67), and those from the moun- 

 tains are slightly larger. The ratio of width to length is 

 practically constant in the two selected series. As to external 

 measurements, the total length and tail vertebrae are shorter in 

 both mountain and plains series than in the types and topotypes 

 the dimensions of which are given by Allen ; the hind foot aver- 

 ages shorter in the Quinn River animals and longer in the moun- 

 tain chipmunks than in Allen's specimens. The differences are 

 not great, however, and probably indicate only a slightly differ- 

 entiated local race. 



In comparing the series with regard to coloration, it is of 

 course absolutely necessary to determine the stage of the pelage 

 (see Allen, 1890, p. 49, and C. H. Merriam, 1897c, p. 192). Ap- 

 parently the very much worn grayish winter pelage, namely the 

 breeding pelage, is represented in the Quinn River Crossing 

 chipmunks. Those from the mountains are more puzzling. Sev- 

 eral are in the process of molt, which suggests that some of them 

 exhibit the breeding, others the post-breeding coat. Of the forty- 

 six specimens taken above 7000 feet, seven (nos. 7940, 7959, 

 7955, 7951, 7952, 7948, and 7945) are either molting, or still wear 

 the breeding pelage. These individuals are very similar in 

 coloration to the Quinn River series. The mountain animals 

 were trapped from June 25 to August 9, those from the plains 

 being obtained from ^lay 17 to June 20. In reality the two 

 pelages, as exemplified by the two series of chipmunks, are not 

 so different as might be expected. The mountain series is some- 

 what brighter (those exhibiting the summer pelage are here 

 referred to), the sides having a wash of light buffy ochraceous 

 which is lacking in the Quinn River specimens. Furthermore, 

 the ventral surface of the tail is more nearly ochraceous than 

 pale buff. 



The Quinn River animals accord fairly well with Allen's 

 characterization of pictus in the breeding pelage (1890, p. 115). 

 The coloration, however, in our specimens is light gray rather 

 tlian slate gray. 



Distribution. — Specimens of Eidauiias pichis were taken as 

 follows: at Quinn River Crossing (4100 feet), 26; Big Creek 



