346 BULLZTIX: MTSEUil OF COMPARATR'E ZOOLOGY. 



indistinguishable from t\-pical toicnsendii. Another from Bear Valley, 

 San Benito County, to the south of that place, is nearly as dark, yet a 

 shade paler. Through the kindness of Dr. Joseph Grinnell and Mr. 

 H. S. Swarth of the University of California, I have had for examina- 

 tion a very interesting series of nine skins from Auburn, Placer Coimty, 

 north central California, at the semi-arid western foot of the Sierra 

 Nevada. Two of these are in dark immature pelage. Two others 

 (7755, 19214) agree perfectly with specimens of pallescens from 

 Arizona or Wyoming, though the bases of the hairs are a trifle darker 

 than the average of that subspecies. Four, though of a richer brown 

 than pallescens are yet not quite so dark as topical toicnsendii of the 

 humid coastal area. Nevertheless they are nearer to the latter than to 

 pallescens. The remaining specimen is indistinguishable in any essen- 

 tial particular from toicnsendii of the Oregon coast. This last example 

 ser\'ed as the t\"pe of C. macrotis intermedius Hilda W. Grinnell. 

 \Yith the advantage of more abundant material and after careful 

 consideration, I feel unable to concur with Mrs. Grinnell in regarding 

 these specimens as representing a recognizable race. They are clearly 

 intermediate between pallescens and toicnsendii; the t}'pe can be 

 absolutely matched by Oregon specimens of the latter, while others 

 again, from the same locality, might without \-iolence be referred 

 to the former. In other words, a series of topot\-pes shows no char- 

 acters by which they may constantly be distinguished from the two 

 neighboring races over any considerable area. The same series was 

 originally referred . to toicnsendii by Dr. Joseph Grinnell, and the 

 si)ecLmen3 are on the whole best considered as representatives of that 

 subspecies, with a tendency toward the pallid form of the interior. 

 The same is true of specimens from Happy Camp (Siskiyou Co.) 

 and Bear Valley (San Benito Co.), referred by Mrs. Grinnell to 

 'intermedins.' A single skin (6957 Univ. of Cal., Mus. Vert. Zool.) 

 from Johnson's Harbor, Santa CatalLna Island, California, though 

 much too dark to be t^-pical of pallescens is not so dark as t\'pical 

 toicnsendii. Though an intermediate specimen in color, it may 

 for the present be considered nearer the latter. The record is of 

 interest in connection with the occurrence of other small land mam- 

 mals on this island, some of them distinct insular representatives of 

 continental species. 



Specimens examined. — Including intermediate sjjecimens, which are 

 nearer toicnsendii than pallescens, twenty-three from the following 

 localities : 



British Columbia: Comox, 1 (Biol. Sur\'.). 



