378 Mr. O. Thomas on 



Upper incisors exceedingly weak, their main cone without 

 any posterior secondary cusp, thougii their cingulum develops 

 a minute cusplet anteriorly, and a second posteriorly, the 

 latter being, however, at least as far from the tip as is the 

 secondary cusp of the canine from its tip. (In the specimen 

 which 1 refer to D. alius each incisor is bitid, with a dis- 

 tinct posterior secondary cusp rather more than halfway up 

 the main cusp, while tlie cingulum does not develop any 

 trace of additional cusplets.) Small premolar not nearly 

 filling up the space between the canine and the large pre- 

 molar, but well separated from the latter. 



Dimensions of the type, in skin (soft parts measured by 

 collector in tiesh) : — 



Forearm 66 millim. 



Head and body 80 ; tail 22; hind foot 10; ear 13. 



'i'hird tingtr, metacarpal 64, first phalanx 10. Fiftii 

 finger, metacarpal 35, first phahinx 17. Calcar 22. 



Greatest length of skull 18. Front of canine to back 



Hub. Central America. Type from Escazu, Costa Rica. 

 Other specimens fioni Guatemala, San Jo.-e, Costa Kica, 

 Pueblo Kuevo, N.AV. Panama, and Boquete, Chiiiqui. 



Type. Adult female. P.M. no. 98. 10. 9. 3. Collected 

 2nd November, 1897, by C. F. Underwood. 



The six Central-American specimens of DicUdurus in the 

 British Museum all agree in the above characters, and are 

 clearly ditlerent from an individual believed to be from 

 Surinam, which latter may be taken provisionally to represent 

 the Brazilian D. alius. 



It does not seem to have been hitherto noticed that the 

 remarkable horny tail-capsules characteristic of DicUdurus 

 are present only in the male, the female having merely a 

 slightly modified indication of their position. 



Dijjliylla centralis^ sp. n. 



Externally quite similar to D. ecaudata, except that the 

 legs arc rather less heavily haired, and there is not so much 

 white on the digits and tips of the wings. Colour of back 

 and belly, where the hairs are dark to their bases, near 

 " seal-brown " ; anteriorly on the shoulders and neck the 

 colour is markedly lighter, owing to the broad whitish bases 

 to the hairs. D. ecuudata is rather darker throughout, 

 with less white on the bases of the shoulder hairs. 



Skull rather rounder and less sharply arched above than in 



