Mar. 1898. NORTH AMERICAN MAMMALS ELLIOT. 211 



face a lead color rather than an ashy white hue. The other 

 characters, such as the long and soft pelage, white feet and tail, 

 mouth and pouch entrance, blackish, and the long and slender 

 claws, are well exhibited. 



Average measurements of seven specimens, recorded by the col- 

 lector : Total length, 217 mm.; tail, 62; hind foot, 26. Maxi- 

 mum total length, 228 ; tail, 68 ; hind foot, 26. Minimum total 

 length, 202 ; tail, 64 ; hind foot, 26. 



37. Thomomys bottae. 



Oryctomys (Sarcophorus) bottae. Eyd. and Gerv. Mag. Zool., 

 vol. vi., 1836, p. 23, pi. xxi. , fig. 4 molars. 



Two specimens : i, Portola, San Mateo Co.; i, Carmel River, 

 Monterey Co. 



These specimens were taken respectively in July and Decem- 

 ber, and present two very different phases of pelage. The July 

 example is bright reddish brown above and buff beneath, while 

 the one obtained in December is a deep rufous brown above, 

 inclining to black in the -middle of the back, and plumbeous 

 beneath, with a buff wash, caused by the tips of the hairs, which 

 are of that color. 



38. Perognathus olivaceus. 



Perognathus olivaceus. Merr. N. Am. Faun., No. i, 1889, p. 



15- 



Two specimens : i, Mt. Siegel, Douglas Co., Nev. ; i, Ander- 

 son's Ranch, Douglas Co., Nev. 



I refer these examples to Dr. Merriam's species named above, 

 as they appeared to answer his description, but to be certain, 

 I forwarded them to him for comparison with his specimens, and 

 he decided that they were possibly intermediate between P. 

 olivaceus and P. o. amcenus. The locality is a new one for the 

 species, and possibly when a sufficient number of examples are 

 obtained to enable a definite decision to be reached, the form 

 may be found worthy of at least a sub-specific separation. At 

 present I retain the specimens as belonging to Dr. Merriam's 

 species. 



39. Perognathus californicus. 



Perognathus californicus. Merr. N. Am. Faun., No. i, 1889, 

 p, 26. 



Two specimens from Portola, San Mateo Co. 



