1905.] OF THE GENUS RHINOLOPHUS. 81 



at middle. Summit of sella square-cut, oi^ 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 Rh. simplex and viegaphyllus. 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, celehensis, and horneensis. 

 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.megajjhylhi^s 

 monachtos, Rh. nanus, Rh. bo7'nee7isis sj^adix). Lancet long and 

 cuneate. Wing-structure and pi-oportionate length of tail as in 

 simplex. Plagiopatagium inserted on tarsus. 



Colour (six skins ; adult individuals, but teeth quite, or almost, 

 unworn). Veiy peculiar. General impression ; a very 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 iinder side a somewhat lighter appearance. 

 All the specimens are exactly alike in colour. 



Skull. Essential characters as in Rh. simplex. Nasal swellings 

 narrow. 



Dentition. Pg is, if anything, a little more redvTced than in 

 simplex. In two skulls I find it placed in the tooth-row, but 

 slightly 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^. 



Measicrements. On p. 84. 



Distribution. Batchian. 



Technical name. One of the two typical specimens (in the Berlin 

 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. 



Remarks. The dentition of Rh. truncatus proves it to be on a 

 slightly higher level than simjilex ; the interspace between the 

 upper canine and p^ is a little nai*rower, p^ a little more reduced. 

 The vacillation in the position of pg 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 horneensis. In its coloration it seems to stand alone. 



* A good series of skins, but no spirit-specimens, are at my disposal. This 

 description is from the resoftened nose-leaves of three examples. 



PBGC. ZooL. Soc— 1905, YoL. II. No. VI. 6 



