54 



l^^OETH AMEEICAN FAUNA. 



[no. 39. 



THOMOMYS BOTT.E PASCALIS Merriam. 

 Fresno Pocket Gopher. 



(PI. IV, fig. 1.) 



Thomomys angularis pascalis Merriam, Proc. Biol. Soc. Washington, XIV, 111, July 

 19, 1901 



Type. — Collected at Fresno, San Joaquin Valley, California, by 

 Clark P. Streator, March 4, 1892. Type specimen in U. S. Nat. Mus.. 

 Biological Survey collection. 



Distribution.' — East side of San Joaquin Valley, Cal., from Stockton 

 south to San Emigdio Canyon and Cuyama Valley (fig. 6) . 



Characters. — Size approximately as in hottx; hind foot averaging 

 32 mm. in adult males and 28 mm. in females; ear short; color dull 

 ochraceous; skull with broad base and swoUen bullae; mammae in 4 

 pairs; inguinal 2-2, pectoral 2-2. 



Color. — Winter pelage: Upperparts dull ochraceous, slightly dark- 

 ened on nose and face; ear patch inconspicuous; underparts paler 

 ochraceous; feet white; irregular white spots in many specimens on 

 legs, throat, and beUy. Summer pelage: Brighter, more fulvous 

 above and below than in winter pelage. The summer pelage is 

 slightly paler than in angularis and the winter pelage instead of being 

 darker than the summer, as in angularis and hottx, is still paler. 



Slcull. — Shorter and wider, with larger bullae and more swoUen 

 auditory meatus than m hottse; smaller than in angularis, less ridged, 

 with much larger, more rounded bullae and with narrower angular 

 process of lower jaw, and rarely with sagittal crest, even in old males. 



Measurements. — ^Average of 3 topotypes ad.): Total length, 

 219; tail vertebrae, 73; hind foot, 32. Average of 4 females from 

 type locality: 195, 63, 28. Slcull (of type, c? ad.): Basal length, 41; 

 nasals, 16; zygomatic breadth, 28; mastoid breadth, 23; alveolar 

 length of upper molar series, 8.6. 



Remarlcs. — Specimens from Tehachapi, Old Fort Tejon, and San 

 Emigdio Canyon and Mount Pinos, at the south end of the San 

 Joaquin Valley, vary from typical pascalis in smaller bullae and 

 larger auditory meatus, showing probable intergradation with hottx of 

 the adjoining chaparral-covered ranges. Specimens from Cuyama 

 Valley about equally approach pascalis, hottx, and pallescens. On the 

 north, three specimens from Stockton might almost as well be 

 referred to angularis. 



Specimens examined. — Total number, 169, as follows: 

 California (San Joaquin Valley): Alila, 5; Bakersfield, 2; Bakersfield (8 miles 

 northeast), 2; Bodfish, 11; Bodfish (12 miles below), 2; Buena Vista Lake, 6; 

 Buena Vista Slough, 1; Buttonwillow, 12; Cuddy Canyon (near Frazer Moun- 

 tain), 1; Cuyama Valley, 4; Delano, 1; Earlmart, 2; Fresno, 16; Lane 

 Bridge, 29; Lemoore, 7; Modesto, 5; Mount Pinos (5,500-8,500 feet altitude), 

 6; Oakdale, 4; Old Fort Tejon, 10; San Emigdio Canyon, 7; Stockton, 3; 

 Tehachapi, 10; Tejon Pass (8 miles west), 3; Tipton, 9; Tulare, 1; Walker 

 Basin, 10. 



