1875.] MR. G. E. DOBSON ON NEW SPECIES OF BATS. 473 
a narrow interval, through which the small first is visible from 
without. 
Length, head and body 1'"6 ; tail 1-6; head 0-55; ear 0-45; 
tragus 0'"22; forearm 1'°2; thumb 0!*22; second finger 2!'25 ; 
fourth finger 1!'-65 ; tibia 0'-5 ; foot and claws 0!-22. 
Hab. Africa; eastern and western coasts. 
4, VESPERUGO TYLOPUS, 0. sp. 
Muzzle broad and evenly rounded in front ; nostrils opening on a 
level with the glandular prominences on each side, and without 
intervening emargination ; glands of the upper lip greatly developed, 
forming smooth, almost naked prominences, causing a furrow along 
the centre of the face behind the nostrils. Ears triangular, narrowed 
above, with rounded tips, the ascending part of the inner margin 
very faintly convex, nearly straight; the upper third of the outer 
margin straight, succeeded by a considerable convexity, causing the 
upper third to appear concave, then distinctly angularly emarginate 
opposite the base of the tragus, and terminating in a well-defined 
lobe midway between the base of the tragus and the angle of the 
mouth, but on a lower level than the mouth. This angular emar- 
gination and round terminal lobe are even better-defined than in /. 
nanus. ‘Tragus faintly concave along inner margin, outer margin 
slightly convex, tip obtusely rounded off; a minute very acutely 
pointed projection slightly above the base of the outer margin. 
Thumb rather long ; the whole of the lower surface of basal half 
occupied by a naked rounded callosity of a pale yellow colour (in 
alcohol), with transverse wrinkles ; the sole of the foot is similarly 
formed, but the surface is flat, or slightly concave. The light yellow 
colour of these callosities or elastic and adhesive pads of the thumbs 
and feet contrasts remarkably with the very dark colour of the 
integument of the surrounding parts. 
Postealcaneal lobe distinct ; extreme tip of tail projecting. Inner 
upper incisors long, bifid, the smaller cusp placed posteriorly and 
externally near the extremity ; outer incisors very short, but in 
transverse diameter equal to the inner ones, placed in a plane slightly 
anterior, the single cusp sloping inwards and lying against the 
cingulum of the inner incisors. Lower incisors trifid, not crowded. 
First upper premolar internal, but visible from without. 
Length, head and body 1°55; tail 1'°5; head 0:55; ear 05; 
tragus 0-2; forearm 1''"2; thumb 0:26 ; second finger 2'"4 ; fourth 
finger 1'"65; tibia 0-55 ; foot and claws 0':26. 
Hab. North Borneo. 
Type in the collection of the British Museum. 
The peculiar structure of the sole of the foot and of the inferior 
surface of the thumb has not been previously noticed in V. nanus, 
and has hitherto been described in the genus Tylonycteris only. 
Among other Mammalian orders an homologous condition of the sole 
of the foot is found in Hyra (in the arboreal species especially) by 
which these animals are enabled to run up the smooth faces of rocks 
and climb to the summits of lofty trees. As these animals have no 
