Bats and Rodents from America. 549 
So far as I am aware, no Oryzomys has hitherto been 
described from Lower California, where the occurrence of one 
of these reddish tropical forms is a matter of much interest. 
Akodon pulcherrimus, sp. n. 
A large Akodon of a very dark colour, with prominent 
white ear-patches. 
Size rather large. Fur long, soft and thick, 12 or 13 millim. 
in length on the back. General colour deep fuscous brown, 
perhaps nearest to Ridgway’s “‘ mummy-brown,” quite unlike 
that of any other species known to me. The long hairs are 
black, the shorter hairs dark slaty basally, dull orange 
fulvous terminally; this colour extends over the upper 
surface of the face and crown, down the nape, and over the 
whole back and down the outer side of the forearms, but is 
very sharply separated on the sides from the pure white of 
the under surface, which not only extends from chin to anus, 
but runs up on each side to form a large and prominent patch 
below and behind the ears; the breadth between the patches, 
across the dark colour of the nape, is only about 10 or 
11 millim. On the rump the dark dorsal colour also ends 
higher up than usual, and is abruptly replaced by white on 
the hams. The hairs of the belly, although white terminally, 
are slaty basally, but on the chin and ear-patches the hairs, 
or, at least, most of them, are snowy white to their roots. 
Hars of fair length, well-haired, their outer surface black 
anteriorly, whitish posteriorly, their inner surface with their 
posterior fourth black, margined in front with white. When 
the ears are folded the visible surface is in consequence 
black anteriorly and posteriorly, with whitish hairs between. 
Hands and feet whitish, but the heels and ankles are more or 
less suffused with fulvous; claws of medium length. | Tail 
about the length of the body without the head, well-haired, 
prominently black above, whitish or pale fulvous below, a 
narrow line of deep fulvous margining the black. 
Skull and teeth apparently of normal Akodont structure. 
Brain-case and supraorbital ridges rounded; zygomata not 
boldly expanded ; interparietal small and narrow. Anterior 
palatine foramina ending opposite the first third of m.’. 
Dimensions of the type (an adult female, measured in flesh 
by collector) :— 
Head and body 110 millim.; tail 80, Re-made, the skin 
measures 115, tail 84, hind foot (moistened) 23, ear (moist- 
ened) 15:5. 
Skull: basal length 24, basilar length 22°5; greatest 
breadth 18°65; nasals 11*1x3:4; interorbital breadth 4:7; 
palate length from henselion 12; diastema 76; palatal 
foramina 6°6 xX 2°2; length of upper molar series 4°1. 
