Jials and liudents j ruin America. j-iJ 



So far as I am aware, no Orj/zonij/s has liitlierto been 

 described fiom Lower California, where the occurrence of one 

 of tliese rcihlish tropical forms is a matter of much interest. 



Alcodon puhherrimnSj sp. n. 



A large Akodon of a very dark colour, with prominent 

 white car-i)atclios. 



Size rather large. Fur long, soft and thick, 12 or 13 millim. 

 in length on the back. General colour deep fuscous brown, 

 j)erhaps nearest to Kidgway's *' nuimmy-brown," quite unlike 

 that of any other species known tome. 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 naj)e, and over the 

 whole back and down the outer side of the forearms, but is 

 very sharply separated on the sides from the j)ure white of 

 the under surface, which not only extends from chin to anu-i, 

 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 th;in usual, and is abruptly replaced by white on 

 the hams. The hairs of the belly, although white terminally, 

 arc slaty basally, but on the cliin and car-patclies the hairs, 

 or, at least, most of them, are snowy white to their roots. 

 Ears of fair length, well-haired, their outer surface black 

 anteriorly, whitisii posteriorly, their inner surface with their 

 posterior fourth black, margined in front with white. Wiien 

 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 tiie body without the head, well-haired, 

 prominently black above, whitisii or pale fulvous below, a 

 narrow line of deep fulvous margining the black. 



Skull and teeth apparently of normal Akodont structure. 

 Brain-case and su])raorbital ridges rounded; zygomata not 

 boldly expanded ; interparietal small and narrow. Anterior 

 palatine foramina ending opposite the first third of w.\ 



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 1--3 6; nasals ll*lx;:i-4; interorbital breadth 4-7; 

 palate length from henselion 12 ; diastema 7*6 ; palatal 

 foramina 6'6 X 2"2 j length of upper molar series 4T. 



