Genera Heteromys and Neotoma, 235 
grey. Tail sharply bicolor, black above, white below and 
on the sides ; well covered with hairs, but the scales showing 
through. Ears very large, laid forward they reach in front 
of the anterior canthus of the eye ; their minute hairs reddish 
brown. 
Skull strongly built, its frontal profile convex ; supra- 
orbital ridges strongly marked; anterior palatine foramina 
barely reaching backward to the level of the anterior root of 
m1. Teeth small; their structure as usual. 
Dimensions of the type (an old male in spirit) :— 
Head and body 180 millim., tail 165; hind foot, without 
claws, 33°7; ear from notch 29. 
Skull: basal length 41°6, greatest breadth 24:7; nasal 
length 18-4; interorbital breadth 6; interparietal, length 5, 
‘ breadth 11; palate, length 25-1; length of palatine foramina 
9:8, upper molar series 8°4. 
Hab. San Diego, California. Coll. Prof. Eigenmann. 
Neotoma lepida, sp. n. 
Size very small, smaller than in any known species. 
Colour soft ashy grey, washed with pale fawn, the general 
tone not unlike that of specimens of N. artizone; hairs 
of chest and inguinal region pure white, those of belly 
grey basally. Lars large, their minute hairs whitish. Hands 
and feet pure white. ‘l'ail very thickly haired, so much so 
as to be intermediate between that of the round-tailed and 
the bushy-tailed species, the scales entirely hidden by the 
hairs ; its colour mixed brownish fawn above, white below. 
Skull small and delicate ; frontal profile flattened ; supra- 
orbital edges square, scarcely ridged; palatine foramina as in 
N. macrotis; molars small. 
Dimensions of the type (a skin, fully adult) :— 
Head and body (probably stretched) 180 millim., tail (c.) 
100, hind foot 27:2, ear 25. 
Skull: lambda to nasal tip 34°5; greatest breadth 21:2; 
nasal length 14°6 ; interorbital breadth 5:4; palate, length 20 ; 
palatine foramen 8-2 ; upper molar series 7°5. 
Hab. Utah. 
This interesting wood-rat had been put down as N. cinerea, 
but its far smaller size and less bushy tail will readily distin- 
guish it from that species. 
