290 DIPODOMYS. 



h. Dipodornys inerriami mortivallis Elliot. 



Dipodomys merriami mortivallis Elliot, Pub. Field Columb. Mus., 

 Ill, 1903, p. 250. Zool. Ser. 

 Death Valley Kangaroo Rat. 



Type locality. Furnace Creek, Death Valley, Inyo County, Cali-' 

 fornia. 



Geogr. Distr. Death Valley and near-by region on the west. 



Genl. Char. Similar to D. m. simiolns, but the dorsal and ventral 

 stripe and pencil of the tail vary from a purplish tint to pale russet, 

 quite different from the blackish tail of D. m. simiolus. The general 

 color of the upper part of the body is also darker. The skulls of the 

 two races are much alike save that of the present one has much longer 

 and broader nasals, widening anteriorly; extreme width of parietal is 

 greater and the mastoids are broader. 



Color. Above russet, darkest on the rump, plumbeous under fur 

 showing; sides dark russet; spots behind ear, superciliary stripe, face 

 in front of eye, nose, entire under parts, stripes across thighs and 

 feet, pure white ; inner side of thighs deep russet like rump ; black bar 

 across rump; tail bushy on apical third, with dorsal and ventral stripes 

 and also bushy portion or pencil pale russet. 



Measurements. Total length, 240; tail vertebrae, 142; hind foot, 

 37.5; ear, 14,. Skull: total length, 36; Hensel, 22; greatest width of 

 mastoids, 22; interorbital constriction, 13; width of interparietal, 17; 

 length of nasals, 13; width of nasals posteriorly, 2; anteriorly, 3; 

 length of upper tooth row, 3.5; height of coronoid process from 

 angle, 6. 



i. Dipodomys merriami arenivagus Elliot. 



Dipodomys merriami arenivagus Elliot, Pub. Field Columb. Mus., 

 Ill, 1903, p. 249. Zool. Ser. Id. Mamm. Middle Amer. & W. 

 Indies, F. C. M. Pub., iv, Pt. i, 1904, p. 347. Zool. Ser. 

 San Felipe Kangaroo Rat. 



Type locality. San Felipe, Lower California, Mexico. 



Geogr. Distr. Northeastern coast of Lower California, Mexico. 



j. Dipodoiriys merriami atronasiis Merriam. 



Dipodomys merriami atronasus Merr., Proc. Biol. Soc. Wash., ix, 

 1894, p. 113. Elliot, Mamm. Middle Amer. & W. Indies, 

 F. C. M. Pub., IV, Pt. I, 1904, p. 348. Zool. Ser. 

 Black-nosed Kangaroo Rat. 



Type locality. Hacienda La Parada, twenty -five miles northwest 

 of the City of San Luis Potosi, State of San Luis Potosi, Mexico. 

 Geogr. Distr. Known only from the type locality. 



