62 



NORTH AMEEICAN FAUNA. 



[no. 39. 



Color. — Type (collected December 3): Upperparts bright buffy 

 orange; underparts, feet, and tail pale buffy or whitish; a scarcely 

 perceptible dusky ear spot. 



Sl^uU. — Old male: Very heavy and angular, with narrow brain- 

 case, short heavy rostrum, abruptly decurved incisors, angular and an- 

 teriorly spreading zygomatic arches, deep lateral pits of palate, promi- 

 nent and revolutely margined pterygoids. 



Measurements. — Type: Total length, 255; tail vertebrae, 87; hind 

 foot, 36. SlcuU: Basal length, 41.5; nasals, 15; zygomatic breadth, 

 29; mastoid breadth, 23; interorbital breadth, 6; alveolar length of 

 upper molar series, 9. 



Remarks. — The type and only specimen of magdalense is a fine old 

 male from this barren, sandy island off the coast of Lower California. 

 While having strongly marked affinities with anitse of the mainland, 

 the single specimen is so different as to indicate a well-marked insular 

 species. The general characters are those of anitx greatly accentu- 

 ated. It evidently belongs in the hottse group and is not more different 

 from that species than is angularis, just over the ridge from the type 

 region of hottse. 



Specimen examined. — One, the type. 



THOMOMYS ALTIVALLIS Rhoads. 

 San Bernardino Mountain Pocket Gopher. 



(PI. Ill, fig. 9.) 



Thomomys altivallis Rhoads, Proc. Acad. Nat. Sci. Philadelpliia, 1895, 34, Feb. 21, 1895. 



Type. — Collected on San Bernardino Mountains, California, (altitude 

 5,000 feet), by R. B. Herron, August 10, 1894. Type specimen in 

 Acad. Nat. Sci. Philadelphia. 



Distribution. — San Bernardino Mountains, Cal. (fig. 6). 



Characters. — Size large, hind foot in males averaging 34, in females 

 30; ears short; color dull and dark; skull long, well ridged, with 

 heavy dentition and sloping posterior base of zygoma; mammae in 4 

 pairs, inguinal 2-2, pectoral 2-2 (one individual with 2 pairs of 

 abdominal also). 



Color. — Paler than in hottde, slightly duller and darker than in pal- 

 lescens; upperparts dull ochraceous with trace of darker dorsal stripe; 

 ear patch, nose, and cheeks blackish; underparts, feet, and most of 

 tail buffy or soiled whitish. Pelage apparently brighter ochraceous in 

 summer than in winter, but only traces of much-worn winter pelage 

 are shown in the specimens examined. 



Slcull. — Longer and less spreading than in hottae, less sharply ridged, 

 with less inflated auditory meatus, and heavier rostrum; larger than in 

 pallescens, with heavier rostrum and less sharply constricted posterior 

 base of zygomatic arch. 



