f 137 ) 



greatest breadth, 86-5 ; nasals, (Ux:i2-.'j : muzzle to orI>it, lo:i ; breadth of brain- 

 case, 58 ; muzzle to anterior premolar, fil ; length of upper tooth series (alveoli), 57 ; 

 crowns, 60 ; of lower tooth series (alveoli), 65 ; of lower premolars (alveoli), 26. 



'////;<?.• Adult male. Original number, 131. Collected 2 June, I'.iOl. Two 

 specimens. 



I cannot find any described species to which tliis tiny little deer, the smallest 

 of its genus, should be assigned. Its basal length of skull |is decidedly less than in 

 any of the forms referred to by Mr. Bliller {P. Biol. Soc. Was//., xiv. p. 35, 1901), 

 where this important measurement is givew both for his B. costaricensis and for 

 the Mexican species described by Dr. Merriam. 



I have great pleasure in connecting with it the name of the Hon. W. Rothschild, 

 to whose liberality I am indebted for the pleasure of working out this most 

 interesting collection. 



5. Didelphis marsupialis battyi subsp. nov. 



Closely allied to D. m. caucae Allen, and agreeing with it in most details ; but 

 the face is uniformly dark, with distinct white spots, about \ in. in diameter, round 

 the roots of the snpra-orbital and malar tufts of bristles. These white spots are 

 clearly the remnants of the usual light frontal and cheek patches, the lower cheeks 

 and lips being in the present animal no lighter than the rest of the head. No light 

 dorsal bristles present in any of the specimens. Tail white for rather less than half 

 its length, its basal fifth being like the body. 



Skull rather narrow, the mnzzle long and the zvgomata little expanded. 



Dimensions of the type, measured in skin : Head and body, 430 mm. ; tail, 

 390 ; white part of tail, 180 ; hindfoot (wet), s.u. 57, c.u. 63 ; ear (wet), 50 ; skull, 

 greatest length in middle line, 108 ; basal length, lOt) ; greatest breadth, 52'5 ; 

 combined length of three anterior upper molarit'orm teeth, 18-4. 



Type: Old female. Original number, 106. Collected 6 May, 1901. Four 

 specimens. 



The four skins are all exactly similar in size and colour, and no doubt represent 

 an insular form of the Colombian D. m. caiicar. 



