1905. j OF THE GENUS KHIXOLOPHUS. 91 



of canine 21-2 [18-2-20]; length of brain-case, inion to anterior 

 point of proencephalon 13-7 [11-3-12-5] ; width of brain-case above 

 zygomata 9-5 [7-9-8-2] ; zygomatic width 10-8 [9-9-9] ; nicaxillar 

 width, across a ntero- exterior corners of nr' 8-5 [6*8-7-2] ; inter- 

 orbital constriction 2-2 [2-4-2-8] ; palatal bridge, median length 

 2-6 [1-8-2-3] ; maxillar tooth-row 8-7 [7-7-6]; extreme width of 

 m' 2-2 [1-5-1-9]. 



Dentition. I have not seen the mandible of this Bat. p" in 

 row ; cusp almost imperceptible. 



Measurements* . On p. 92. 



Type. $ ad. (in alcohol). Pulo Siantan, Anambas Group ; 

 September, 1899. Collected by Dr. W. L. Abbott. Tin. St. Nat. 

 Mus. no. 101714. 



Remarks. As already pointed out above, the Bats of the 

 horneensis type inhabiting the S. Natuna and Karimata groups, 

 rather close to the north-western and western coasts of Borneo, 

 are so extremely like the typical horneensis as to be, perhaps, 

 scarcely separable. But farther westimrds, on the much more 

 isolated Anambas Islands, the horneensis type has developed into 

 the present, peculiarly modified species. In the lengthening of 

 III.-, the shortening of lY.^ and the shortening of the tail (com- 

 pared with the tibia), Rh. nereis has taken the same cou]\se as the 

 still more Avestern Rh. stheno (described below). But the shape 

 of its skull sufficiently proves it to be an offshoot, not of that 

 species, but of Rh. horneensis. Compare with this the " remarks " 

 under Rh. stheno. 



10. Rhix'olophus stheno, sp. n. (Plate III. fig. 8, a, h.) 



Diagnosis. Allied to Rh. horneensis, but anterior nasal swellings 

 much more projecting. Lower leg long : 19-8-20-8 mm. Tail 

 extremely short : 15-5-17-8 mm. Slightly larger than horneensis : 

 forearm 45-2-48 mm. 



Details. This is a third modification of the horneensis type, in 

 several respects recalling Rh. nereis, in others quite peculiar. 

 The shape of the facial portion of the skull is unique within the^ 

 present group. As in Rh. 7iereis, III." is lengthened, IV. ^ 

 shortened ; the tail is extremely short. The general size of the 

 animal is slightly increased. 



Plagiopatagium inserted 1-3 mm. above the ankle-joint. 



Colour. (S ad., Penang ; teeth unworn ; skin. — General im- 

 pression : reddish brown above ; under side much lighter, con- 

 trasting with the upper side. "Mars-brown" above; base of 

 hairs light " drab " ; under side almost " broccoli-brown." — 

 Three spirit-specimens (Selangor ; teeth unworn) apparently 

 agree in colour with the skin. 



/Skull (three individuals). Owing to the much more projecting 

 anterior nasals wellings, the skull of Rh. stheno, in side view, is 

 strikingly different from that of Rh. horneensis. This peculiarity 



* The tip of the ears and tlie posterior nose-leaf are damaged ; forearms broken. 



