line Xeolmpica' Mumma's. 219 



Proechimys* roso, sp. n. 



Size about as in I', clirysmolua^ Tlios. Back coarsely 

 sjiiious, sitk'S ratlier less so, riiiii|) and f)nt('r sich'S of liinhs 

 witliout s|)iiu's ; spines of back about 20 iniliiin. long (without 

 Icvniinal bristlfs) by 1*2 niiilini. wide. General colour ratlier 

 similar to that of P. chrystpolus and equally heavily black- 

 lined, but more fulvous and less rufous, the hairs of the back 

 with deep fulvous subteiminal and black terminal bands. 

 Forehead, cheeks, and sides of neck <^reycr. llnnip and hips 

 brownish fulvous. Under surface pure white. Outer sides 

 cf arms and legs brownish, inner sides white ; up|)er surface 

 of hands and fi'ct pale brownish, becoming white at the bases 

 of the toes. Tail iairly well haired, black above, dull whitish 

 below. 



Skull lartrc and heavily built ; nasals very long, reaching 

 fiack past tiic front edge of the orbit, narrow, evenly tapering 

 backwards; supraorbital edges broadly ridged, the ridges 

 evenly continuous posteriorly with those that run forwards 

 from the outer corners of the interparietal ; molars narrow 

 vertically ; hamular ]n-ocesses of pterygoids broad and spatu- 

 late ; bullre rather small. 



Dimensions of the type (measured in the flesh by col- 

 lector) : — 



Head and body 235 niillim, ; tail 1G8 ; hind foot (s. u.) 52; 

 ear 27. 



kSkull : greatest length 60; basilar lengtli 43*5; greatest 

 breadth 28-2; nasals 22-6 x T'l ; interorbital breadth 12-6; 

 greatest breadth across temporal ridges 22 3 ; height of molar 

 in centre 3*3; ])alate length 21; diastema 13'3 ; palatal 

 foramina 5 x 3'3 ; breadth of hamular processes 2'4 ; breadth 

 between bulla; on basilar suture 36 ; length of upper molar 

 series 9"5. 



Ilah. Santa Rosa, S.W. Ecuador. Alt. 10 m. 



Type. Male. B.M. no. 0. 1. 1. 40. Original number 434. 

 Collected 21»th June, 1899, by Mr. Perry O. Simons. Three 

 specimens. 



Mr. Simons obtained six sjiecimens of ProecJiimya at Santa 

 Rosa, and these prove to belong to two species — one paler, 

 \Nith white feet, broader nasals, and broader nialars, which 

 appears to belong to the grouj) containing P. semispinosua, 

 Tomes, and /*. dtciimanus, Thos., to the lormer of which 1 

 provisionally refer it ; and the second, now described, darker 

 coloured and with brownish feet, evidently most nearly allied 

 to P. chrysaolus. From that animal, whose habitat is 



• Eihimyf, Ructorum. !?ce Allen, Bull. Am. Mus. xii. p. 257 (1800). 



