Merriam — Descriptinns of Ten Neio Kangaroo Rats. 77 



rather squarely siyrcadin.s ())ut short) anterior arm of zygomata, hroad 

 and strongly angled maxillary areh, and broad frontoparietal shield. 



Sknll short, s;im" size as parntH and m )-!t like parnis, from which it 

 (htiers inarkcdlij in smaller and less inflated mastoid bnlljie (espeeially 

 rear si'etion which thw- not project so far posteriorly), and le vs conspicn- 

 ously in longer nasals, longer (and slightly broader) maxillary arches, 

 which stand ont more squarely. Both have rather broad frontoparietal 

 shields and inti'rparietals. Clearly belong to same group although color 

 ditlerence great. 



Eeinarks. — D. mitrgnyitae requires comparison with only one known 

 species, parrui^, its small size (skull ;'>:]. o x I'l') alone being sutticient to dis- 

 tinguish it from all others except t'.c/V/.y, and its bulke are smaller even than 

 those of e.rilis. 



Measinrme)its. — Type specimen ( c? yg. ail.): total length, 2;>4; tail 

 vertebra, 144; hind foot, ;5S. Average of ;^. specimens from type locality: 

 total length, 240; tail vertebne, 1411; hind foot, .'IS. 2. 



Dipodomys insularis sp. nov. 



Ti/jie from San Jose Island, Gulf of California, off Lower California, 

 Mexico. No. 79,0.3;'), 9 ad., U. S. National Museum, Biological Survey 

 Collection. Collected Aug. H, LSOr), by J. E. McLellan. Orig. No. 1457. 



Characters. — Size small; color pale pinkish buff only lightly lined with 

 dark hairs; nose and whisker i)atches only faintly develojjed. 



Voluf. — (Iround color i»inkish buff with vinaceous tinge on rumi) and 

 flanks, as in uiargnritae. Compared with iiu'lanurKS from the mainland 

 of the Cape region: color very much paler and of ditl'erent tone; crested 

 part of tail paler and less strongly crested ; ears larger. Com])ared with 

 lilalijccphidus: gent'ral color paler; tail crest browner. The young are 

 decidedly paler than young ^^i plalycephalns. 



Cranial characters. — Skull small but rather broad, with very broad 

 maxillary arches. Compared with jilati/ccpJtalus the skull is smaller; 

 frontoparietal shield nmch narrower; mastoid bulhe decidedly smaller. 



Measuremeuts. — Tyi^e specimen ( 9 ad.): total length, 248; tail verte- 

 brae, 14o; hind foot, 39. Average of 5 specimens fntm type locality: total 

 length, 240; tail vertebra^ 14(5; hind foot, ;U».0. 



Dipodomys merriami kernensis subsp. nov. 



Type from Onyx, west end of Walker Pass, Kern Co., Calif., No. 108,884, 

 6^ ad., U. S. National Museum, Biological Survey Collection. Collected 

 July 25, 1901, by W. K. Fi.-^her. Orig. No. 210(5. 



Characters. — Size small; color pale ochraceous buff, as in nevadensis, 

 moderately lined with dark hairs; under tail strii)e hardly continuous to 

 tip but probably contiimous in fresh pelage; nose and whisker spots 

 nearly obsolete; sides of face, nearly white, reaching from sides of nose 

 to eye and covering cheeks (under eye); thigh patch ochraceous buff to 

 heel. Ear as in nevadensis. 



Cranial vharaclers. — Skull small and square, with small mastoids. 



