350 DIDELPHTID^. 



(1841) ; Schinz, Syn. Mamm. i. p. 603 (1844) ; Waterh. N. H. 

 Mamm. i. p. 503 (1846) ; Burm. Thiere Bras. i. p. 137 (1854). 

 Micoureus griseus, Gerv. H. N. Mamm. ii. p. 287 (1855). 



Gkbt Opossttm:. 



Size about as in D. murina. Pur close, soft and rather fluflfy. 

 General colour above uniform deep grey, with scarcely a tinge of 

 rufous. Face rather paler grey, the dark eye-markings confined 

 to the front of the eye, and comparatively inconspicuous. Ears very 

 large, leafy, laid forward (in spirit-specimens) they reach halfway 

 between the anterior cauthus and the tip of the nose, their anterior 

 basal projection small and rounded. Chin, chest, and beUy pure 

 sharply defined white, the line of demarcation, especially on the 

 neck, with a slight rufous or fulvous wash. Front of fore and out- 

 sides of hind limbs grey, back of fore limbs white, a white ring 

 sometimes running right round them at the elbow. Back of hands 

 pale brown, of feet white. Toes and pads as in D. murina. Pouch 

 absent *. Tail long, slender, tapering, its basal half-inch furry, 

 the remainder practically naked ; grey above, whiter below. 



STctdl long and narrow, with a very long and slender muzzle, the 

 facial index therefore unusually high (see measurements). Nasals 

 distinctly expanded behind. Supraorbital region narrow, its edges 

 smoothly rounded, without trace of ridges. Zygomata but little ex- 

 panded laterally. Anterior palatine foramina unusually long, reaching 

 nearly or quite to the level of the back of p.' Posterior palate with 

 the usual pair of long narrow vacuities. 



Teeth. Canines short and thick. P.' both above and below about 

 one fourth the size of p.^ ; and in each case p.^ and p.* about equal, but 

 if they differ the latter is slightly larger above and smaller below. 



Dimensions. 



t (in spirit). 

 Adult, 

 millim. 



Head and body 129 



TaU 175 



Hind foot 19-5 



Muzzle to eye 16-5 



Ear 21-5 



Skull, see next page. 



Hah. Central and Eastern Brazil. 

 Type not in existence. 



„ , I Ad. sks. I Eio Janeiro. Purchased. 



"'"■ ) Skull of fl. f 



* Mammse not visible in the only epirit-specimen examined, 

 t From a specimen preserved in the Berlin Museum. 



