36 PROCEEDINGS OF THE ACADEMY OF [1895. 



4. Thomomys bottee pallescens subsp. nov. Type, ad. $, No. 1,932, Col. of 



S. N. Eboads, Grapelands, San Bernardino Valley, California. Col. by K. 

 B. Herron, Marcb 22, 1894. 



Description. — Size large, feet, relatively, of medium size, with 

 short, thick claws. Color above, dull, tawny-brown, lightest on 

 rump, browner on nape, with blackish shade on head. Ears, hind- 

 ear patch and chops, sooty; feet and lower surfaces of limbs, ash; 

 breast, belly, vent and lower margin of sides, tawny-ash. Skull 

 massive, angular; dentition relatively weak; interparietal longer 

 than wide. 



Measurements. — Total length, 260 mm.; tail vertebra;, 89; hind 

 foot, 33.5; middle claw of manus, 9.2. Skull — Total length, 39; 

 greatest zygomatic breadth, 24.4; basilar length, 35.5; length of 

 nasals, 11.9; interorbital constriction, 6.9; length of mandible, 25. 



A series of nine specimens from two localities in the San Bernar- 

 dino Valley and two from Banning, California, show constant and 

 easily recognized color differences from typical specimens of bottw 

 from Nicasio. The tail of type specimen is much longer than the 

 average, which is about the same as in bottcv. The heavily ossified, 

 angular skull, in all its characters, is similar to that of bottce. What 

 Pallescens is to bottce,, both geographically and anatomically, Neo- 

 toma fnscipes dispar is to Neotoma fnscipes. 



5. Thomomys fulvus nigricans subsp. nov. Type, ad. $ , No. 2.007, Col. of S. N. 



Rboads, Witch Creek, San Diego Co., California. Col. by F. Stephens, 

 Dec. 22, 1893. 



Description. — Size small ; tail rather short and well haired; pelage 

 full and long. Color above, uniform blackish-brown, becoming 

 fulvous on the sides and along the upper liue of belly, then grayish 

 on limbs and feet and lower belly line, then strong fulvous on median 

 line of breast and abdomen and ventral region. The lips, cheek- 

 pouches, and ears are sooty, and the hairs of under parts are basally 

 of the same color, imparting an unusually dark aspect to slightly 

 worn specimens. 



Skull— Of the slender build, wide interparietal and relatively 

 massive dentition of the fulvus type. 



Measurements. — Total length, 215 mm.; tail vertebras, 72; hind 

 foot, 28. Skull — Total length, 37; basilar length, 33; greatest zygo- 

 matic breadth, 23; length of nasals, 13; interorbital constriction, 6; 

 length of mandible, 23. 



Eleven examples of this form, recently forwarded by Mr. Stephens, 



