Gemra Xyctaliin, Tyloiiyctoris, and n|»i.strolIiii». 2'.\\ 



piihital incision not broadeue'I, it-« posterior eilgo liivol with 

 the initlJle of the canine. Posterior piihite rather narrow, 

 with an avera<;e median point. Basial pits indicated hy 

 slight hiti'ral concavities opposite the basil. ir suture. 



'IVeth as in P. abraniuSj l)iit smaller. 



Incisors short, the anterior prominently bicuspid ; outer 

 incisor surpassing the second cusp ot the inner one. Large 

 premolar well sej)arated from the canine, the space not filled 

 up l)y the well-developed anterior premolar, which equals i^ 

 in area, and stands a little internally. Lower anterior pre- 

 molar three-fourths the height of the posterior, and r.ither 

 less than half its area in cross-section. 



Dimensions of the type (slightly immature) : — 



Forearm 30 mm. 



Head and body 37 ; tail .SI ; ear on inner edge 7*7 ; tragus 

 (inner edg.-) 3, breadth 1'7 ; third finger, metacarpus 27, 

 first })halar.x 10; fifth finger, metacarpus 26, first pha- 

 lanx 7-8 ; tibia 11 ; foot (c. u.) 6. 



vSkuU : greatest length 12" 1 ; basi-sinual lengtli 8*7; 

 condyle to front of canines 10*7 ; inteiorl)ital breadth 3"1 ; 

 breadth of brain-case 6 ; mastoid breadth 6*i ; palato-sinual 

 length 4*3 ; breadth between outer corners of m'^ 4:"6 ; front 

 of canine to back of m' 4:'2 ; front of p^ to back of m^ 2 6 ; 

 lower tooth-series exclusive of incisors 4'3. 



Hub. Bouin Islands. Type from Hillsborough Island. 



Ti/p\ Female in spirit, slightly immature. B.M. 

 no. "Jl. 2. 2. 3. Presented by II. Seebohm, Esq. Collected 

 by P. A. Hoist. 



Tills Pipistrtd, from the isolated Bonin group, is distin- 

 guishable by its narrow skull, as indicated by tlie measure- 

 ments above, and the wide space between its canine and /;*. 

 It is presumably most nearly allied to the Japanese 

 jP. ubramus. 



Named in honour of Admiral Sir F. C. D. Sturdee, U.N. 



Fipistrellus principulug, sp. n. 



A small species with the short tooth-row of P. tenuis and 

 mimu.s, but the skull much more inflated. 



Size very small, about as in P. tenuis und mimus. General 

 external characters as in those species. Ears of normal size, 

 their substance thin ; tragus of medium length and breadth, 

 the external basal lobe large and sharply pointed. Wings 

 to the base of the toe.-'. Post-calcarial lobe distinct. Tail 

 with seven vertebrje, its lip projecting. 



Colour blackish, but as the specimen is in sjiirit, the exact 



10* 



