1905. } OF THE GENUS RHINOLOPHUS. 81 
at middle. Summit of sella square-cut, or even concave. Base 
of fur almost blackish. Forearm 44°7-46°8 mm. 
Details. In this species the sella* is not of the shape charac- 
teristic of Kh. simplex and megaphyllus. It is narrower, not 
considerably broader at the base than at the summit, and the 
constriction at the middle is less distinct. This points decidedly 
away from simplex, and towards nanus, celebensis, and borneensis. 
The square-cut (or concave) summit of the sella seems to be a 
rather common feature in those forms of the present section of 
the group which are inhabitants of small islands (cf. Rh. megaphyllus 
monachus, Rh. nanus, kh. borneensis spadix). Lancet long and 
cuneate. Wing-structure and proportionate length of tail as in 
simplex, Plagiopatagium inserted on tarsus. 
Colour (six skins; adult individuals, but teeth quite, or almost, 
unworn). Very peculiar. Generalimpression: avery dark brown. 
Details: hairs of upper side “ broccoli-brown” at tip; below the 
tip, for a broad space, almost “‘ clove-brown” (more exactly: an 
exceedingly dark shade of “ hair-brown,” very much approaching 
clove-brown); the extreme base of the hairs, immediately at the 
skin, again somewhat lighter. Individual hairs of the under side 
much of the same colour, but the tips more brightly broccoli- 
brown, giving the under side a somewhat lighter appearance. 
All the specimens are exactly alike in colour. 
Skull. Essential characters as in Rh. simplex. Nasal swellings 
narrow. 
Dentition. p, is, f anything, a little more reduced than in 
simplex. In two skulls I find it placed in the tooth-row, but 
shghtly towards the external side; in a third, on the one side 
half external, on the other external; in a fourth, external on both 
sides, and the interspace between p, and p, therefore very narrow. 
p is always in the tooth-row; its cusp rather well developed, 
though somewhat smaller than in simplex. No interspace 
between p” and p’. 
Measurements. On p. 84. 
Distribution. Batchian. 
Technical name. One of the two typical specimens (in the Berlip. 
Museum) was collected on Batchian by A. R. Wallace and for- 
warded to Prof. Peters by Tomes. The whole series in the British 
Museum is from the same island and the same collector, and four 
of the examples belong to the recently acquired Tomes Collection ; 
they are therefore practically (though not technically) co-types. 
kemarks. The dentition of Rh. truncatus proves it to be ona 
slightly higher level than simplea; the interspace between the 
upper canine and p’ is a little narrower, p’ a little more reduced. 
The vacillation in the position of p, gives evidence of the same ten- 
dency as in simplex: towards the more advanced members of the 
group. In the shape of the nose-leaves it has taken a course point- 
ing towards borneensis. In its coloration it seems to stand alcne. 
* A good series of skins, but no spirit-specimens, are at my disposal. This. 
description is from the sesoftened nose-leaves of three examples. 
Proc. Zoou. Soo.—1905, Vou. If. No. VI, 6 
