iieic Neotropical Mammals. 439 



inch only, the fur extending about a quarter of an inch more 

 along tlie tail below than above ; rest of tail practically 

 naked, but the lines dividing the scales with numerous minute 

 and quite inconspicuous hairs running along them ; in colour 

 the substance of the tail is uniformly brown above and rather 

 paler below, while iu D. philander the terminal portion is 

 whitish all round. Mammae 3 — 1 — 3 = 7. 



{Skull very much as in the allied species, apart from its 

 conspicuously smaller size. As so often happens, however, 

 in the case of smaller species otherwise closely allied, the 

 skull of the type, fully adult, agrees better iu its form witii 

 younger specimens of the larger sjjecies, sharing with them a 

 general roundedness, which disappears in equally aged 

 examples of D. philander. 



Dimensions of the type (an old female in spirit) : — 



Head and body 196 millim. ; tail 289; lower leg 48 ; hind 

 foot 30 ; ear 22. 



Skull : basal length 44*4 ; greatest breadth 28 ; nasals, 

 length 28*8, greatest breadth 6*9, least breadth 3'1 ; post- 

 orbital processes, tip to tip, 15'3 ; intertemporal constriction 

 9-1 ; palate, length 25-6, breadth outside "^ 14*9, inside ^i-^ 

 10*7 ; palatal foramen 4*8 ; length of molars L-z? 6*7. 



These measurements are taken in the same way as, and may 

 be conveniently compared with, those given in the ' Catalogue 

 of Marsupials ' *, 1888. 



IJab. Botanic Gardens, Trinidad. Presented and collected 

 by J. H. Hart, Esq. 



The differences between this form and the true D. philander 

 were noticed by rne in 1891 on the arrival of ^Ir. Hart's 

 specimen ; but 1 did not then consider myself justified in 

 describing it on a single female specimen and in ignorance of 

 the type locality of D. philander. Now, however, not only 

 has Mr. Caracciolo sent a male skin, which agrees in 

 every respect with Mr. Hart's female, but Messrs. Allen and 

 Chapman f have also noted similar characteristics in a speci- 

 men collected in Trinidad by the latter author; while at the 

 same time my inquiries about the Seba mammals \ have 

 convinced me that the specimen g, measured in the ' Catalogue 

 of Marsupials,^ should be looked upon as the actual type of 

 Linnseus's species. 1 have therefore no longer any hesitation 

 in describing the Trinidad form as distinct. 



* Pp. 338 and 341. 



t Bull. Am. Mus. N. II. v. p. 2-30 (1893). 



i P. Z. S. 1892, p. 309 et seqq. (see especially p. 316). 



