274 On new Mammals from South America. 



Dasyprocta ruhrata flavescens, subsp. n. 



Similar to the typical form and equally different from 

 D. aguti in the dark tone of the fore back, sides, and under 

 surface, the black nape and black limbs, but with the ends 

 of the rump-hairs orange-yellow instead of red as in the 

 Brazilian species, to which, however, there seems no real 

 relationship. 



TIab. Caripe, Cumana, Venezuela. 



Type B.M. no. 94-. 9. 25. 17. Immature. Collected 

 January 1894 by Mr. A. Mocquerys. 



The yellow rump gives this animal a superficial resem- 

 blance to D. aguti, but it is evidently most nearly allied to 

 D. ruhrata, from which it is different enough to deserve 

 subspecific separation. 



Marmosa regina, sp. n. 



Larger than M. cinerea, and therefore the largest species 

 of the group as yet described. Fur comparatively short and 

 close, about 11 millim. in length on the back. General 

 colour above buffy grey, finely speckled with brownish. 

 Sides gradually becoming more buffy yellowish, passing into 

 deep yellowish, almost ochraceous, on the under surface. The 

 hairs of the under surface are slaty-based on the sides of the 

 belly, deep yellowish to their bases on the chin, throat, chest, 

 groins, and middle line of belly. On the chest in the type 

 (an old male) there is a skin-gland whose secretion has 

 darkened the neighbouring fur to a reddish brown. Dark 

 orbital marks of medium development ; forehead between 

 them light buffy. Ears apparently rather small, their ante- 

 rior basal projection well marked. Upper surface of hands 

 and feet dull buffy. Tail furry, though not very thickly so, 

 for its basal inch, the remainder practically naked, pale brown 

 throughout, not lightening terminally. 



Skull, as compared to that of M. cinerea, showing a ten- 

 dency to the narrowness of brain-case and interorbital region 

 characteristic of Aletachirus, towards which this species seems 

 to show some approximation. Nasals expanded behind, but 

 less so than in the allied forms. Supraorbital ridges well deve- 

 loped, but not widely expanded ; narrowest part of brain-case 

 behind the tips of their postorbital processes. Temporal ridges 

 approaching to within 2*5 millim. on the top of the brain- 

 case. Teeth light and delicate, the molars particularly small 

 in proportion to the size of the animal. 



