502 Mr. O. Thomas on 
large, evenly rounded, rising from the same spot on the 
muzzle; their anterior edge with four or five minute and 
inconspicuous warts; their keel moderately developed, not 
broadened or folded externally ; antitragus as in africanus ; 
tragus large, quadrangular, with rounded corners; a small 
angular projection present halfway down its outer margin. 
Wings to the ankles. Callosity at base of thumb unusually 
large. No gular sac. 
Colour of body above dark chestnut-brown ; below brown 
laterally, the median area of throat, chest, and belly white. 
Wings and interfemoral membrane above brown, below white, 
becoming rather browner distally. 
Skull smaller and conspicuously narrower than in NV. afr- 
canus. A median crest developed along parietal suture, more 
developed than in africanus, but disappearing on interparietal, 
where the bone is smooth and transparent. Anteorbital and 
mastoid projections comparatively little developed. Pre- 
maxille incomplete mesially. Incisors 7. Anterior upper 
premolar small, in the general line of the tooth-row. 
Dimensions of the type (measured in spirit) :— 
Forearm 60 millim. 
Head and body 80; tail 53; ear 22; tragus on outer 
edge 7, breadth 4; height of antitragus behind 4; diameter 
of pollical callosity 3:2; third finger, metacarpal 57, first 
phalanx 25, second phalanx 21; fifth finger, metacarpal 32, 
first phalanx 15, second phalanx 7; lower leg and foot 
(s. u.) 28. 
Skull: greatest length 22°5; basal length in middle line 
17°7; zygomatic breadth 14; anteorbital breadth 8°5 ; inter- 
orbital constriction 4°7; mastoid breadth 13:2; front of 
canine to back of m*® 8°8; front of lower canine to back of 
mz 10. 
Hab. Fianarantsoa, EK. Betsileo, Madagascar. 
Type. Male. B.M. no. 82.3. 1.34. Collected by the 
Rev. W. Deans Cowan. 
This is the “rather smaller, white-bellied, and light- 
winged form ” of N. africanus referred to in Mr. de Winton’s 
paper on the group*. It is, I think, fully distinct enough 
to be separated specifically, as the skull-differences are very 
strongly marked, in addition to those of colour and locality. 
Nyctinomus cisturus, sp. n. 
A medium-sized species, with imperfect premaxille, united 
ears, and a peculiar swollen gland at the base of the tail. 
* Ann, & Mag. Nat. Hist. (7) vii. p. 37 (1901). 
