Merriam Descriptions of Ten New Kangaroo Hats. 77 



rather squarely spreading (but short) anterior arm of zygomata, broad 

 and strongly angled maxillary arch, and broad frontoparietal shield. 



Skull short, same si/r as /tarni* and inn 4 like par v us, from which it 

 differs markedly in smaller and less inflated mastoid bullee (especially 

 rear section which does not project so far posteriorly), and le^s conspicu 

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

 which stand out more squarely. Both have rather broad frontoparietal 

 shields and interparietals. Clearly belong to same group although color 

 difference great. 



Remarks. I), margaritae requires comparison with only one known 

 species, parvus, its small size (skull 33.5 x 22) alone being sufficient to dis 

 tinguish it from all others except exilis, and its bullse are smaller even than 

 those of c.riliti. 



Measurements. Type specimen ( c? yg. ad.): total length, 234; tail 

 vertebra 1 , 144; hind foot, 38. Average of 3 specimens from type locality: 

 total length, 240; tail vertebrae, 149; hind foot, 38.2. 



Dipodomys insularis sp. nov. 



Type from San Jose Island, Gulf of California, off Lower California, 

 Mexico. No. 79,053, $ ad., TJ. S. National Museum, Biological Survey 

 Collection. Collected Aug. (>, 1S95, by J. E. McLellan. Orig. No. 1457. 



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

 dark hairs; nose and whisker patches only faintly developed. 



Color. Ground color pinkish buff with vinaceous tinge on rump and 

 flanks, as in margaritae. Compared with mc.lanurus from the mainland 

 of the Cape region : color very much paler and of different tone ; crested 

 part of tail paler and less strongly crested; ears larger. Compared with 

 platycephalus: general color paler; tail crest browner. The young are 

 decidedly paler than young of platycephalus. 



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

 maxillary arches. Compared with platycephalus the skull is smaller; 

 frontoparietal shield much narrower ; mastoid bullre decidedly smaller. 



Measurements. Type specimen ( 9 ad.): total length, 243; tail verte 

 brae, 143; hind foot, 39. Average of 5 specimens from type locality: total 

 length, 249; tail vertebrae, 146; hind foot, 39.0. 



Dipodomys merriami kernensis subsp. nov. 



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

 c? ad., TJ. S. National Museum, Biological Survey Collection. Collected 

 July 25, 1901, by \V. K. Fisher. Orig. No. 2106. 



Character*. Size small; color pale ochraceous buff, as in nevadensis, 

 moderately lined with dark hairs; under tail stripe hardly continuous to 

 tip but probably continuous 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 nennli'nxix. 



Cranial characters. Skull small and square, with small mastoids, 



