1915. 3 



THOMOMYS BOTM GKOtJP. 



55 



THOMOMYS BOTT^ PALLESCENS Rhoads. 



Grapeland Pocket Gopher. 

 (PI. Ill, fig. 8.) 



Thomomys hottx pallescem Rhoads, Proc. Acad. Nat. Sci. Philadelphia, 1895, 36, Feb. 

 21, 1895. 



Type. — Collected at Grapeland, San Bernardino Valley, California, , 

 by R. B. Herron, March 22, 1894. Type specimen in Acad. Nat. Sci. 

 Philadelphia. 



Distrihution. — San Bernardino Valley, Cal., north to San Fernando 

 (fig. 6). 



Characters. — Size of hottx, but paler, and with buffy or wliitish belly 

 and less ridged skull: mammse in four pairs. 



Color. — Summer pelage: Upperparts dull ochraceous, darker along 

 line of back and around nose; ear patch blackish; underparts pale 

 buffy or soiled whitish. Winter pelage: Upperparts heavily clouded 

 with blackish: underparts clear pale buff in sharp contrast. 



SJculL — Long and narrow, with narrower braincase and less spread- 

 ing zygomatic arches than in hottse; lateral ridges parallel, never meet- 

 ing in old males; incisors decurved more nearly at right angles to 

 axis of skull. 



Measurements. — ^Average of 5 topotypes ( ad.): Total length, 

 268; tail vertebrae, 84; hind foot, 32.3. Average of 5 females from 

 type locahty: 207, 64, 28. Slcull (of topotype, ad.):^ Basal length, 

 43; nasals, 16; zygomatic breadth, 27; mastoid breadth, 22; alveolar 

 length of upper molar series, 9.5. 



Rennarlcs. — The subspecies pallescen^ is a large pale form of the 

 hottse group, differing from both pascalis and altivallis in cranial and 

 external characters, but combining some of the characteristics of 

 both with those of hottde. The only typical specimens examined are 

 from the great dry San Bernardino Valley. Those from San Fernando 

 are darker colored and almost as near to hottse, while Santa Paula, 

 Mono Flats, and Little Pine Valley specimens might mth almost 

 equal propriety be referred to pallescens or hottx. 



Specimens examined. — Total number, 68, as follows (fig. 6) : 

 California: Beaumont, 1; Cajoii Pass (west slope), 1; Cajon Wash (near San Ber- 

 nardino), 10; Cold Water Canyon, 1; El Casco, 4; Glendora, 4; Grapeland, 18; 

 Jumpa Mountains, 2; Lytle Creek, 3; Reche Canyon (4 miles southeast of 

 San Bernardino), 3; San Bernardino, 17; San Fernando, 3; West Riverside, 2. 



THOMOMYS BOTT^ INFRAPALLIDUS Grinnell. 

 Carrizo Plain Pocket Gopher. 

 Thomomys mfmpallidus Grinnell, Tniv. of Cal. Publ. Zool.; XII, 314, Xov. 21, 1914. 



Type. — Collected on Carrizo Plain (Pimento Ranch, 7 miles south 

 of Simnder) San Luis Obispo County, California, by H. S. Swarth, 

 May 25, 1911. Type specimen in Mus. Vert. Zool., Univ. of California. 



iNo. 94013, U. S. Nat. Mus. 



