104 Mr. 0. Tliomas on 



la /o, sp. n. 



Size very large, the largest member of tlie family Vesper- 

 tilionidpe, the forearm slightly exceeding that of Pteri/gustcs 

 lasioj^terus, the largest previously known species. General 

 appearance suggesting that of a gigantic dark-coloured 

 Serotine. Fur very soft and fine, hairs of back about 

 10 millim. in length. General colour above dark blackish 

 brown, the hairs dark brown throughout or with indistinct 

 lighter tips; below, the hairs are similarly brown basally, 

 but broadly lighter term.inally. Kump rather, but not con- 

 spicuously, browner than the more blackish shoulders. 

 Muzzle black, with numerous black whisker-bristles. Ears 

 fairly large, their inner margin strongly and evenly convex 

 from the distinct basal lobule to their tip ; tip narrowly 

 rounded off; outer margin straight or faintly concave above, 

 slightly convex below ; antitragus long, low, rounded. 

 Tragus of medium length, its inner margin concave, tip 

 narrowly rounded, outer margin strongly convex, slanting 

 strongly forwards above and belov^' from a point opposite the 

 middle of the inner margin (in this respect not unlike pi. xv. 

 fig. 4 of Dobson's Catalogue) ; basal lobule large, directed 

 downwards. 



Limbs and wing-membrnnes practically naked throughout; 

 the body-fur extends slightly on to the extreme base of the 

 interfemoral membrane above, and there are a few fine hairs 

 along the back of the calcar. No postcal^areal lobule. 

 Calcar very short. Feet large, the claws enormous, strongly 

 curved. The length of the longest claw (measured above) in 

 Pijnstrellus and Vespertih'o is about one twentieth of the 

 forearm length, in la it is about one fourteenth. Wings 

 attached to the sides of the ankles. Tail-tip free of the 

 membrane for about 5 millim. 



Skull rather elongate, not markedly flattened ; the zygo- 

 mata not widely expanded. Occipital "helmet" high and 

 projecting backwards over the occipital surface. Anterior 

 palatine notch extending back to the level of the small pre- 

 molars. BuUfe of average size. 



Outer upper incisors quite minute, blunt and rounded, not 

 as high as the cingulum of ^^ and not more than about one 

 tweltth of its area in cross-section, situated on the outer ante- 

 rior side of it in such a way as to be conspicuously visible from 

 above, even when the skull is tilted so far forward that the 

 large inner incisor cannot be seen. Inner incisors long 

 j)0werful, slightly convergent, bicuspid terminally, the small 



