1915. 3 



THOMOMYS BOTT^ GROUP. 



59 



covered slopes along the sides of the valley. In a valley so narrow 

 the two forms undoubtedly hitermingle to some extent along the 

 boundaries of their respective habitats, but most of the specimens 

 show no intermediate characters. 



Specimens examined.— Totol number, 23, as follows: 

 California: La Piierta, 21; San Felipe Valley, 2. 



'THOMOMYS BOTT^ ANIT^ Allen. 

 Cape San Lucas Pocket Gopher. 

 (PL V, fig. 11.) 



Thomomys fulvus anitse Allen, Biil. Am. Miis. Nat. Hist., X, 146-147, 1898. 



Type. — Collected at Santa Anita, Lower California, by Dane 

 CooHdge, May 28, 1896. Type specimen in British Museum. 



Distrihution. — Southern part of Lower California from Santana 

 south to Cape San Lucas (fig. 7). 



CTiaracters.SMghtlj smaller than hottse; larger than nigricans; 

 thin haired, bright tawny all over at all seasons, but little darker above 

 than below; skull heavy, with abruptly decurved incisors; mammae in 

 4 pairs. 



Color, — For most of the year bright tawny, nearly concolor; under- 

 parts slightly lighter because thinly haired; feet and tail haK naked. 

 In new autumn pelage, apparently from September to December, 

 shghtlv duller, more grayish. Young, slightly paler, with whitish 

 belly. 



Slcull. — Relatively heavier than in hottx or nigricans, with short, 

 heavy rostrum, abruptly decurved incisors, short thick pterygoids, 

 and full rounded bullae. 



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

 243; tail vertebrae, 78; hind foot, 32.8. Average of 5 topotypes 

 (9 ad.): 208, 67, 30. Slcull (of topotype, c? ad.):' Basal length, 

 40: nasals, 14; zygomatic breadth, 25.5; mastoid breadth, 21; inter- 

 orbital breadth, 6.5; alveolar length of upper molar series, 8.8. 



RemarTcs. — Evidently intergradation is complete through local 

 forms up the peninsula through nigricans to hottse. The subspecies 

 anitsd strikingly resembles fulvus, however, and but for its direct 

 connection with &ote I should not change Dr. Allen's original arrange- 

 ment, making it a subspecies oi fulvus. The 5ote and/wZws groups 

 are widely separated geographically. Externally anitx is not easily 

 distinguishable from sinalox, just across the gulf, but the skulls are 

 different. 



Specimens examined. — Total number, 99, as follows: 



Lower California: Cape San Lucas, 11; La Paz, 12; Las Palmas, 1; Matancita, 

 6; Miraflores, 5; Rosarito, 20; San Jorge, 5; San Jose del Gabo, 10; Santana, 8; 

 Santa Anita, 16; Tres Pachitas, 1; Triunfo, 4. 



1 No. 146831, U. S. Nat. Mus. 



