March, 1904. Mammals of Southern California — Elliot. 309 



Perognathus mesembrinus. 



Perognathus mesembrinus Elliot, Pub. Field Columb. Mus., 

 C903, p. 251. Zoology. 



13 Specimens from Palm Springs. 



"At the base of the San Jacinto Mountains, in the vicinity 

 of Palm Springs, this form occurs fairly common on rocky mesas 

 and about the mouths of the canons." 



ClI.KTODIIMS. 



Perognathus penicillatus. 



Perognathus penicillatus Woodhouse, Proc. Acad. Nat. Scien. 

 Phil., 1852. p. 200. Elliot, Syn. N. Am. Mamm., 1901, p. 252. 



13 Specimens: 3 Palm Springs. 4 Whitewater, 2 Morongo 

 Pass, 4 Oro Grande. 



I refer these specimens to the present species, although they 

 are much less in their dimensions, the largest being in total 

 length, t 85 ; tail, 103: hind foot, 23; another is 182, 99, 24. 

 There is also a conspicuous black patch at the base of the 

 whiskers, which Mr. Osgood states in his Monograph, p. 46, is 

 absent in penicillatus. "This species inhabits the sandy flats 

 and drv creek washes of the desert. They are especially abundant 

 about sand dunes in the lowest parts of the desert, usually 

 occurring wherever Dipodomys deserti is found. Some were 

 secured above 3,000 feet."- 



Perognathus stephensi. 



Perognathus stephensi Merr., Proc. Acad. Nat. Scien. Phil., 

 1894, ]). 267. Elliot, Syn. N. Am. Mamm., igor, p. 253. 



3 Specimens, Mesquite Valley, northwest arm of Death Valley. 



Two of these examples were taken near the edge of the valley 

 and appear best to answer the description of the species, being 

 a uniform pinkish and vinaeeous buff, which is said to be the 

 "left over winter pelage." The one taken near the middle of 

 the valley is a deep, rich cream buff, very much the same color 

 as P. pericalles from Keeler, but of course these specimens are 

 much larger than the Keeler examples. I imagine this cream 

 buff individual to be in the full summer dress, which view, if 

 correct, would show that the seasonal pelages are very different. 

 The species is so very rare, only two specimens besides these 

 examples being m any' collection, I believe, that no information 

 about it has been gained. The three individuals before me 

 were taken on the 1st and 2nd of May. Of the Mesquite Valley 



