364 DrDELPHTIDai. 



to the end of the second phalanx of the fourth ; no trace of the 

 minute postero-external hind foot-pad present in most of the species. 



Shull smoothly rounded above. Interorbital space broad, convex 

 upwards, a faint projection in the usual position of the postorbital 

 processes, but the intertemporal less than the interorbital breadth, as 

 usual. 



Teeth. Upper premolars large, evenly increasing in size backwards. 

 Length of three anterior upper molars about 5 millim., and of the 

 lower molar series 6-5 to 7 miUim. Lower p.^ slightly larger than 

 p.= 



Dimensions, 



6. ?. 



{*). t (in spirit). 

 — < Adult. 



millim. miUim. 



Head and body 130 107 



TaU 59 61 



Hind foot 20 18 



Muzzle to eye 14'5 



Ear ; 9 



Skull, see p. 367. 



Hah. Brazil. 



Type not in existence. 



) Ad. sk. I ri Brazil. Zool. Soc. Coll. 



Brazil. 



a. 



jSkull. I ?• 



, I Ad. sk. , 

 *•{ Skull. \^- 



21, Didelphys iheringi. (Plate IV. fig. 2.) 



Didelphys (Peramys) iheringi, Thos. Ann. Mag. N. S. (6) i. p. 159 

 (1888). 



Lesser Theee-striped Oposstjm. 



Size very small. Fur very short and crisp. Coloration exactly 

 as in the ordinary form of B. americana, i. e. olive-grey on head 

 and fore back, bright rufous on rump and hips ; with three black 

 longitudinal bands running down the back, the median one from 

 between the eyes, and the lateral pair from just above the shoulders. 

 Ears (PI. XXVIII. fig. 7) of medium size, broadly rounded, laid 

 forward (in spirit-specimens) they just reach the posterior canthus of 

 the eye. Chin, chest, and belly pale rufous, the bases of the hairs 

 grey. Arms and legs reddish brown. Hind pads small, distinct, 

 and prominent ; a minute postero-external pad present. TaU about 



* Apud Burmeister, Brlaut. Faun. Bras. p. 84. 



t E^om a spirit-specimen preserved in the Berlin Museum. 



