1915.] 



THOMOMYS BOTTiE GEOUP. 



61 



THOMOMYS BOTT^ MINOR Bailey. 

 Mendocino Pocket Gopher. 



(PI. IV, fig. 2.) 



Thomomys bottse minor Bsiiley, Proc. Biol, Soc, WasMngton, XXVII, 116, July 10, 

 1914. 



Type. — Collected at Fort Bragg, Mendocino County, California, by 

 James H. Gaut, November 30, 1905. Type specimen in U. S. Nat. 

 Mus., Biological Survey collection. 



Distribution. — Coast region of California, from Cape Mendocino 

 south to Cazadero (fig. 6) . 



Characters. — Size smaller than hottx; color slightly darker; skull 

 narrower and slenderer, with especially slender rostrum, and deeply 

 emarginate posterior tip of nasals; mammae in 4 pairs. 



Color. — ^In November pelage, upperparts dark, rich ochraceous or 

 cinnamon-brown, heavily obscured with black, and in most specimens 

 becoming almost black on nose, face, and around ears; feet white; 

 tail grayish; underparts ochraceous-buff ; Hps and lining of cheek 

 pouches usually white. Summer pelage but little lighter or brighter. 



Slcull. — Very slender and rather narrow, with very narrow and 

 deeply emarginate nasals, slender zygomata, rather large and quad- 

 rate interparietal, very small and short audital bullae. Dentition: 

 Incisors slender, light colored, and projecting about as in hottde. 



Measurements. — Type ( c? ad.): Total length, 226; tail vertebrse, 

 73; hind foot, 29. Average of 3 adult males: 219, 73, 29. Topotype 

 (9 young ad.): 187, 58, 24. Slcull (pi type): Basal length, 35; 

 nasals, 13.4; zygomatic breadth, 23; mastoid breadth, 19; interor- 

 bital breadth, 4.7; alveolar length of upper molar series, 7.5. 



Remarks. — This little, dark, narrow-skulled gopher of the rugged 

 coast strip south of Humboldt Bay can not be included with hottx or 

 leucodon, and it is still more distinct from the big, wide-skulled laticeps. 

 It closely resembles nigricans, but can be distinguished at a glance 

 by its slender, protruding incisors. 



Specimens examined. — Total number, 56, as follows: 



California: Cape Mendocino, 2; Cazadero (7 miles west), 3; Ferndale, 11; Fort 

 Bragg, 4; Gualala, 9; Gnrneyville (1 mile west), 1; Mendocino City, 12; 

 Petrolia, 4; Punta Arena, 7; Rockport, 2; Westport, 1. 



THOMOMYS BOTT^ DIABOLI Grinnell. 

 Diablo Pocket Gopher. 



Thomomys diaboli Grinnell, Univ. of Cal., Publ. Zool. XII, 313, Nov. 21, 1914. 



Type. — Collected in Diablo Range, Merced County, California, at 

 Sweeney's ranch, 22 miles south of Los Banos, by C. H. Richardson 

 and H. A. Carr, April 2, 1911. Type specimen in Mus. Vert. Zool., 

 Univ. of California. 



