452 Mr. 0. Thomas on new Mammals from 



as in R. costaricensis. Brighter lateral line little developed. 

 Under surface not sharply defined, its colour much less bright 

 than in costaricensis, the tips of the hairs more or less buffy 

 or fawn-coloured. Ears thinly haired, brown, little darker than 

 the general colour. Hands and feet white, without darker 

 markings on the metapodials. Tail pale brown above and 

 below, the tip white. 



Skull low, with a flat superior profile. Palatal foramina 

 short, barely reaching: backward to the level of the front of m}. 



Dimensions of the type (measui'ed in skin) : — 



Head and body 72 milHm. ; tail (extreme tip doubtfully 

 perfect) 83; hind foot (wet) without claws 19 ; ear (wet) 14. 



Skull : back of parietal to nasal tip 21*1 ; greatest breadth 

 11*5; nasals 8"9x2'6; interorbital breadth 3'7 ; palate 

 length from henselion 9*2 ; diastema 5*9 ; palatal foramina 

 4"1 X 1*6 ; length of upper molar series 3'8. 



Uab. Quito. 



Ti/pe: B. M. no. 98. 5. 1. 9. Killed August 1897. 



" Feeds on flowers and seeds in the gardens. Comes out 

 from among the climbing plants every evening at about 7 P.M." 

 (L. S'oderstrdm). 



This is by far the most southern record for the genus 

 Beithrodontomys, which has not hitherto been found south of 

 Costa Rica. 



-^PEOMYS*, gen. nov. 



Type Oryzomi/s (?) lugens^ Thos.f 



Molars about as in Oryzomys. Skull in general shape, and 

 especially in that of the anterior zygoma-root, as in the less 

 specialized species of Oxymycterus. Thumb with a nail ; 

 claws not specially lengthened. 



From what was said in the original description of " 0. lu- 

 gens " it will be undertitood with what doubt that s[)ecies was 

 placed in Oryzomys^ and the discovery by Mr. Soderstrom of 

 a second species closely allied to it renders it advisable that a 

 genus should be formed for its reception. 



JEieomys vulcarii, sp. n. 



Fur excessively long, soft, and woolly, the underfur about 

 12 and the longer hairs 15 millim. in length. General colour 

 uniform daik buffy grey, not far from the " clove-brown" of 

 liidgway ; this colour is slightly darker along the top of the 



* ainos, a height. 



t Ann. & Mag. Nat. Hist. (6) xviii. p. 306 (1896). 



