1. DIDELPHlfS. 331 



defined. Pouoh well developed. Mainmse 3-1-3 = 7*- Front of 

 fore and oufcsides of hind limbs like back. Hands and feet brown 

 or brown and white. Pads large and rounded as usual, the pollical 

 and haUuoal each more or leas subdivided into two. Tail with its 

 basal two or three inches furry, the change to the scaly part rather 

 abrupt, its tip' gradually lightening to white. 



STcull stout and strong, flattened as compared with that of Z). cms- 

 sicaudata, with a long facial and a small and narrow cranial portion, 

 the distance from between the postorbital processes to the tip of the 

 nasals exceeding that from the same point to the occiput. Zygomata 

 widely expanded, the combined orbito-temporal fossae shojrt and 

 broad, the distance from the lacrymal foramen to the anterior edge 

 of the glenoid fossa not equal to that from one zygoma to the other. 

 Nasals long, abruptly expanding behind. Interorbital space but 

 little rounded, an indistinct concavity along its centre. Supra- 

 orbital edges square or rounded, not overhanging. Postorbital 

 processes sharp and weU defined, with marked ridges running 

 inwards and backwards from them and uniting to form the long and 

 prominent temporal crest. Anterior palatine foramina reaching 

 rather past the middle of the canines. Palate long and narrow, 

 with two pairs of vacuities, the anterior elongated, opposite m.^ and 

 m.3, the posterior small, behind level of m.^ Posterior nares small 

 and narrow. 



Teeth. Upper p.' about one third; the size of p.' ; a small 

 diastema between them. M.* triangular, its antero-posterior 

 diameter about one half its breadth. 



Dimensions, 



?• 



m (in spirit). 



millim. 



Head and body 275 



TaU 270 



Lower leg 71 



Hind foot 38 



Ear 28 



Muzzle to eye 34 



Skull, see p. 341. 



Hah. Neotropical Region, from Mexico to La Plata. 

 Type not in existence. 



1 Ad. sk. I , Vera Paz, Guatemala. 0. Salvin, Esq, fP. & 

 «■ ] SkuU. 1 ^- , 0.]. 



, 1 Ad. sks. I J, Coban, Guatemala. Purchased. 

 *'"■ jSkulloffi. f °- 

 d. Ad. St., <S- Coban, Guatemala. Purchased. 



* In four specimens. In thia formula the middle figure represents the 

 number of central mammse, and the first and third those of the outer parallel 

 series. 



