100 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



In coloration these specimens are close to examples of Micro- 

 tus californicus californicus in the Biological Survey Collec- 

 tion from Alameda, Marin and Monterey Counties ; the brown- 

 ish dorsal coloration with the whitish of the under parts very 

 faintly washed with buffy can be easily matched in our series. 

 While it is true that No. 145279 resembles certain pale-colored 

 examples of edax from the Sacramento Valley, on the average 

 edax is considerably darker. No. 145280, an immature speci- 

 men, is paler than are specimens of edax of corresponding age. 



Lagurus pauperrimus (Cooper) 



"Arvicola pauperrima" Cooper, Amer. Nat., 2, 1868, pp. 

 535-536. (Original description, with notes on habits). 



Specimen examined.— One : No. 10268/35071 U. S. Nat. 

 Mus. ; obverse of label "Arvicola 6 126 Great Plains, W. T. 

 Oct. 9 60 J. G. C." ; reverse, eight measurements. 



This specimen, though in very poor condition (see Lyon and 

 Osgood, 1909, p. 90) is nevertheless of importance from the 

 fact that it is the type of Lagurus pauperrimus ; and the species 

 is of interest because it is one of the earliest known members of 

 the group of short-tailed gray meadow mice of the uplands, now 

 referred to the genus Lagurus. 



Mus musculus musculus Linnseus 



"Mus musculus," Cooper, Zoologv, in Cronise, The Natural 

 Wealth of California, 1868, p. 444. ' 



Specimen examined. — One: No. 5651, Mus. Comp. Zool. 

 Harvard Univ. ; original label missing. Said to have been col- 

 lected in "California" by "J. G. Cooper." 



Specimen has been made over into modern study skin, skull 

 removed but not cleaned; the posterior portion evidently cut 

 away in the original process of preparation. 



Rattus rattus (subspecies indet.) 



"M[mj] rattus," Cooper, Zoology, in Cronise, The Natural 

 Wealth of California, 1868, p. 444 (General note on the intro- 

 duced rats). 



