DECEMBER, 1903. MAMMALS ELLIOT. 249 



length, 33; length of nasals (median), 10; anterior width of nasals, 5; 

 length of mandible, angle to alveoli of incisors, 24. 



This gopher is distributed along the bases of the mountain ranges 

 named above, but does not go out on to the desert, nor west of the 

 Inyo Mountains. Its dark coloring will distinguish it at all times from 

 T. operarius, which seems to be its nearest relative. 



FAM. HETEROMYIDvE. 

 SUB. FAM. DIPODOMYIN^E. 



DIPODOMYS. 

 Dipodomys deserti helleri. Subsp. nov. 



Type locality: Keeler, Owens Lake, Inyo County, California. 



Genl. char. : Size similar to that of D. deserti, color pale ochra- 

 ceous instead of pale yellowish brown ; upper part of tail like back 

 with no black markings, no black on face. 



Color: Upper parts pale ochraceous or dark pinkish buff; of a 

 similar tint, but not so dark as are the upper parts of D. nitratus; line 

 over eyes, sides of nose and forepart of face, entire under parts, limbs, 

 and feet pure white; tail with line above pale ochraceous like back, 

 becoming ochraceous near tip, sides and under part and tip pure 

 white; ear same color as back. 



Measurements: Total length, 333; tail 195; hind foot, 53^5; ear, 

 16. Skull: total length, 43; Hensel, 37; zygomatic width, 21; width 

 of mastoids, 29; greatest width of parietals, 20; length of nasals, 14; 

 palatal length, 14; length of upper tooth row, 5; length of mandible, 

 condyle to tip of incisors, 21 ; length of lower tooth row, 5. 



A series of this form from Keeler, collected by Mr. Heller, pre- 

 sents the same differences from typical D. deserti as D. nitratus from 

 the same locality does from D. m. simiolus. It is much redder, lacks 

 entirely the pale yellowish brown hue of D. deserti, and has no black or 

 dusky hue upon the tail. I have much pleasure in naming this well- 

 marked race after Mr. E. Heller, whose work in the field has con- 

 tributed so greatly to the enlargement of the mammal collections of 

 this Institution. 



Dipodomys m. *arenivagus. Subsp. nov. 



Type locality: San Felipe, Lower California, Mexico. 



Genl. char.: Size small; similar to D. m. simiolus, but paler; ear 



Arena, sand; vagor. to wander. 



