46 



ISrOETH AMEEICAIT FAUNA. 



[no. 39. 



matic breadth, 29; mastoid breadth, 24; alveolar length of upper 

 molar series, 9. Skull of adult female (from same locality): 36, 13, 

 24, 19, 8.7. 



Remarks. — In addition to the unusual discrepancy in size of males 

 and females of hottx there is a great range of local variation in 

 specimens from widely separated localities. To the south this sub- 

 species passes into pallescens; to the north it intergrades with minor 

 and apparently with leucodon; to the east it grades into the larger 

 bright-colored angularis -of the San Joaquin VaUey; and along the 

 eastern side of the valley it runs into the paler pascalis. But in 

 the coast region it is fairly typical from Bodega on the north to 

 San Diego on the south. 



Specimens examined. — Total number, 713, as follows: 

 California (western): Alameda, 1; Alhambra, 4; Arroyo Seco (Monterey County), 

 7; Banta, 7; Bear Valley (head of Carmel River), 2; Berkeley, 18; Big Pine 

 Mountains, 2; Bodega, 11; Carmel River, 1; Carmel Valley, 5; Carpenteria, 

 2; Colma, 1; Cone Peak, 1; Cuyama Valley (Schoolhouse Canyon), 6; Drum 

 Barracks (Los Angeles County), 2; Freestone, 12; Gaviota Pass, 3; Glendora; 

 6; Half Moon Bay, 1; Hay wards, 14; Hernandez (San Benito County), 1, 

 Hueneme, 5; Inverness, 28; Jamesburg, 13; Jolon, 10; Laguna Ranch, 6; La- 

 gunitas, 1; La Honda, 5; Las Virgines Creek, 6; Little Pine Canyon, 1; Los 

 Angeles, 14; LosGatos, 1; Mansfield, 5; Matilija (Ventura County), 9; Mil- 

 pitas Ranch (south base Santa Lucia Peak), 1; Mono Flats, 9; Monrovia, 1; 

 Monterey (Pacific Grove and Point Pinos), 34; Morro, 2; Mount Tamalpais, 

 1; Mountain View (Santa Clara County), 1; Nicasio, 84; Oakland, 1; Olema, 

 1; Pacific Grove, 1; Palo Alto, 44; Palos Colorados Canyon, 2; Pasadena and 

 vicinity, 22; Pescadero, 7; Pine Creek (Bailey's Ranch), 2; Pine Valley 

 (Monterey County), 7; Petaluma, 6; Pleyto, 6; Point Reyes, 18; Point Sur, 

 6; Portolo (San Mateo County), 8; Posts, 11; Pozo, 2; Priest Valley, 9; Red- 

 wood City, 27; Salinas Valley, 4; San Diego, 8; San Francisco (Golden Gate), 

 9; San Jose, 2; San Lorenzo, 1; San Mateo, 2; San Simeon, 2; Santa Ana Can- 

 yon, 4; Santa Barbara, 1; Santa Clara County, 6; Santa Cruz, 6; Santa Cruz 

 Mountains, 1; Santa Inez, 2; Santa Margarita (San Luis Obispo County), 1; 

 Santa Monica, 3; Santa Paula, 1; Soquel (Santa Cruz County), 2; Stanford, 

 48; Stanford University, 7; Stony Creek (Monterey County), 1; Sur River, 1; 

 Tassajara Spring (Contra Costa County), 2; Tomales, 18; Tracy and vicinity, 

 25; Twin Oaks, 13; Union Island, 1; Ventura, 5; Walnut Creek, 16. 



THOMOMYS BOTT^ LATICEPS Baird. 

 Humboldt Bay Pocket Gopher. 

 (PI. m, ng. 6.) 



Thomomys laticeps Baird, Proc. Acad. Nat. Sci. Philadelphia, VII, 335, Apr., 1855. 



Type. — Collected at Humboldt Bay, California, by Lieut. W. P. 

 Trowbridge, February 21, 1855. Type specimen in U. S. Nat. Mus. 



Distribution. — Coast region of northwestern California, from Smith 

 River south to Eel River (fig. 6). 



Characters. — Size and general appearance of hottse, hut color warmer 

 and brighter and less clouded with black- tipped hairs; skuU averaging 

 sHghtly wider, and nasals especially wider; mammae in 4 pairs. 



