tietr Xeotropfcaf Mtvnmalf. 221 



paiietals, but :i|i[i ufiitlv not coaIe.scMi<^ with those t'lat run 

 forwards tVoiii the outer coniiT.s of the, interparietal. Ilainular 

 processes sputnhite, much broader than those of A', chrif' 



Dinicnsi<>ns of the type (measured in the Hesh by col- 

 lector) : — 



Head and body iiOO millim. ; tail 150 ; hind foot (s. u.) 51, 

 (c. u.) 55 ; ear 14. 



Skull : bregma to nasal ti]) 42 ; greatest breadth 'i\\ ; 

 nasiils 2."J*5 X 7'5 ; interorbital breadth 158; greatest breadth 

 on ridges 25 ; palate length from henselion 23 ; diastema 14*2 ; 

 ])alatal foramina 65 X 3*7; length of upper molar series 9'2. 



Unb. Bogava, Chiriqui, N.VV. Panama. Alt. 250 m. 



lypc. Male. Original number 6. Collected 3rd Septem- 

 ber, 1MI8, by Mr. li. J. Watson. Six specimens examined. 



The very dark colour of this Echimys will readily distin- 

 guish it from the other Central-American forms. 



Marmosa cauc(e, sp. n. 



Allied to M. iiicanu, Lund, and M. fuscata, Tho«., but 

 smaller than the first and paler-coloured than the second. 



Size about as in J/, fuscata. Fur soft, short, and close, 

 about 7-8 millim. long on the back. General colour above 

 uniform soft fawn-grey, not unlike that of M. iiicana, but 

 rather more fawny, and also more uniform, less wavy ; centre 

 of face rather paler than back ; black eye-patch present 

 above and below (though not behind) the eye, extending 

 forwards to the roots of the whiskers ; its edges not sharply 

 defined. Ears naked, rather small as compared with the large 

 ears of the allied species, their anterior bases without marked 

 projection. Under surface pale yellowish white, the hairs of 

 chin, throat, chest, and a narrow line down belly of this 

 colour to their bases, those of the sides of the belly slaty for 

 two thirds of their length. Outer sides of limbs like back, 

 inner sides like sides of belly ; hands and feet thinly haired, 

 dull whitish above, wrists and ankles brown. Tail as in 

 the allied species, rather shorter, but doubtfully perfect in the 

 single specimen. 



Skull en the whole very similar in general shape to that of 

 M. iucava, and therefore quite different to that of all the 

 species of the J/, murina group. Nasals broadened poste- 

 riorly, their extension behind the broad part not so elongated 

 as in M. incana. Supraorbital region long, narrow, nearly 

 ])arallel-si(le(l, flattened above, its edges rounded, without 

 ridges or processes. Anterior palatal foramina extending to 



