Genera Nyctaliis, Tylonycteris, and Pipistrelliif*. 231 



palatal incision not broadenerl, its posterior e<lge level with 

 the middle of the canine. Posterior palate rather narrow, 

 with an average median point. Basial pits indicated by 

 slight lateral concavities opposite the basilar suture. 



Teeth as in P. abramus, but smaller. 



Incisors short, the anterior prominently bicuspid ; outer 

 incisor surpassing tiie second cusp of the inner one. Large 

 premolar well separated from the canine, the space not filled 

 up by 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 rather 

 less than half its area in cross-section. 



Dimensions of the type (slightly immature) : — 



Forearm 30 mm. 



Head and body 37 ; tail 31 ; ear on inner edge 7*7 ; tragus 

 (inner edge) 3, breadth 1*7 ; third finger, metacarpus 27, 

 tirst phalanx 10; fifth finger, metacarpus 26, first pha- 

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



Skull: greatest length 12'1 ; basi-sinual length 8*7; 

 condyle to front of canines 10'7 ; interorbital breadth 3*1 ; 

 breadth of brain-case 6 ; mastoid breadth 6'4 ; palato-sinual 

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

 of canine to back of m^ 4*2 ; front of p* to back of ni^ 2"G ; 

 lower tooth-series exclusive of incisors 4'3. 



Hal), Bonin Islands. Type from Hillsborough Island. 



Tyi)". Female in spirit, slightly immature. B.M. 

 no. yi. 2. 2. 3. Presented by H. Seebohm, Esq. Collected 

 by P. A. Hoist. 



This Pipist'.td, from the isolated Bonin group, is distin- 

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

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

 It is presumably most nearly allied to the Japanese 

 P. (ihramus. 



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



Pipistrellus principulus, sp. n. 



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

 miinusj but the skull much more inflated. 



Size very small, about as in P. tenuis and mi'mus. 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 toes. Post-calcarial lobe distinct. Tail 

 with seven vertebrse, its tip projecting. 



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



16* 



