1. DIJDELPHTS. 359 



uniform finely grizzled grey or mouse-colour, cheeks and sides with 

 a paler or more yellowish tinge (but not the distinct orange-colour 

 oi D. dimidiata). Chin, chest, and belly white or greyish white, 

 sometimes with a tinge of yellow. Mammae 5-3-5=13*- Arms 

 and legs, hands and feet grey. Fifth hind toe reaching to the 

 middle of the second phalanx of the fourth. Tail little more than 

 half the length of the head and body, its basal half-inch furry, grey, 

 the remainder short-haired, dark brown. 



Slcull very strong and thickly built. Interorbital region broad 

 and flattened, its edges rounded. Temporal crests absent, or only 

 formed in extreme old age ; no postorbital processes. 



Teeth thick and powerful. Upper premolars evenly increasing in 

 size backwards. Molars very variable in size, the length of the 

 three anterior ranging from 6-2 to 7"7 miUim. Lower p.^ and p.* 

 about equal. Length of lower molar series 9 to 10 miUim. 



Dimensions. 



?• 

 +(in spirit). 

 Adult, 

 millim. 



Head and body 131 



Tail 75 



Hind foot 18 



Muzzle to eye 17'3 



Ear 15 



SkuU, see p. 367. 



Hah. Brazil. 



Go-types in the Vienna and Munich Museums and in collection. 



1 Imm. sk. I , Goyaz, Brazil. Count de Castelnau 



''•jSkiUl. ( ^- [P. &C.]. 



, 1 Ad. St. I J, Brazil. Purchased. 

 *■ j Skull, f ^- . 



1 Ad. sk. I o oi //I ;o/i Cuyaba, Sao Paulo Vienna Museum fE.!. 



"• I Skull. ^Vj^V*/'^*- (NaUerer). 



(One of the co-types of the species.) 



17. Didelphys scalops. (Plate III. fig. 2.) 

 Didelphys (Peramys) acalops, Thos. Ann. Mag. N. H. (6) i. p. 158 (1888). 



Size as in the preceding species, but form rather slenderer and 

 lighter. Eur short, straight and crisp. General colour rufous and 

 grey, arranged as detailed below. Whole of head, both face, cheeks, 

 and chin, bright rusty or orange-rufous. Ears large and rounded, 

 with well-marked anterior basal projections. Back and shoulders 

 finely 'grizzled grey, the hairs mixed black and white. Eump and 



* In four specimens. 



t Preseryed in|the Vienna Museum. 



