198 j\Ir. O. Thomas on new Bats and 



difference which necessitates the varietal separation of this 

 form. In N. aello this measurement is 30*2, in N. cephalotes 

 22-8 to 23-1, and in N. aJhiventer 19-2 to 21-5. 



Pipistrellus nanulus, sp. n. 



A pigmy species with very short forearm. A bone in tlie 

 penis. 



Size very small. Form fairly stout, the body large in 

 proportion to the short forearms, which are shorter than any 

 hitherto recorded in this genus. Fur of medium length ; 

 hairs of back about 4 mm. long. Muzzle thick and broadly 

 rounded, the glandular prominences well developed. Ears 

 rather short, their inner margin straight basally, gradually 

 curving round to form the broadly rounded end to which 

 there is no defined tip ; outer margin slightly concave 

 mesially, slightly convex below ; basal lobe low, well defined 

 posteriorly. Tragus of medium length, fairly broad, its 

 broadest part opposite the middle of its inner margin; the 

 latter straight or faintly concave, tip blunt, outer margin 

 convex; basal lobe sharply angular. Limbs and feet short ; 

 wings to the base of the toes ; postcalcareal lobule narrow, 

 distinct; extreme tip of tail projecting; penis with a bone, 

 its prepuce hairy to the tip. 



Colour (in spirit) blackish brown above and below. All 

 the membranes also very dark, without lighter edging. 



Skull broad and rounded, with large low brain-case and 

 short muzzle ; upper profile line practically straight. Base 

 of skull between bullse broad, its bony edges running outwards 

 quite to the bullse. 



Upper incisors prominently bicuspid ; the inner one with 

 its large postero-external secondary cusp falling but little 

 short of the main cusp, and exceeding by about the same 

 distance the top of the outer incisor ; secondary cusp of tlie 

 latter posterior, about halfway up its main cusp. Anterior 

 upper premolar comparatively large, filling up the triangle 

 between the canine and second premolar, which are separated 

 irorn each other external to it; its tip visible externally just 

 behind the hinder edge of the canine. Lower incisors tri- 

 cuspid, overlapping. 



Dimensions of the type (measured in spirit) : — 



Forearm 25"5 mm. 



Head and body 41 ; tail 25 ; ear 8 ; tragus on inner edge 

 2*7 ; third finger, metacarpus 23, first plialanx 9, second 

 phalanx 12 ; fifth finger 33 ; lower leg 10 ; hind foot 5-6. 



Skull: greatest length ll'l; occiput to bottom of nasal 



