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Show 1905.J OF THE GENUS RHINOLOPHUS. 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]; maxillar width, across antero-exterior corners of m3 8*5 [6*8- 7*2] ; interorbital constriction 2*2 [2*4-2*8] ; palatal bridge, median length 2*6 [l*8-2*3] ; maxillar tooth-row 8*7 [7-7*61; extreme width of m1 2*2 [1*5-1 *9]. Dentition. I have not seen the mandible of this Bat. p2 in l ow ; cusp almost imperceptible. Measurements*. On p. 92. Type. $ ad. (in alcohol). Pulo Siantan, Anambas Group; September, 1899. Collected by Dr. W. L. Abbott. Un. St. Nat. Mus. no. 101714. Remarks. As already pointed out above, the Bats of the borneensis 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 borneensis as to be, perhaps, scarcely separable. But farther westwards, on the much more isolated Anambas Islands, the borneensis type has developed into the present, peculiarly modified species. In the lengthening of III.-', the shortening of IV.1, and the shortening of the tail (compared with the tibia), Rh. nereis has taken the same course as the still more western Rh. stheno (described below). But the shape of its skull sufficiently proves it to be an offshoot, not of that species, but of Rh. borneensis. Compare with this the " remarks" under Rh. stheno. 10. R h in o l o p h u s s t h e n o , sp. n. (Plate III. fig. 8, a, b.) Diagnosis. Allied to Rh. borneensis, but anterior nasal swellings much more projecting. Lower leg long: 19*8-20*8 111111. Tail extremely short: 15*5-17*8 111111. Slightly larger than borneensis : forearm 45*2-48 mm. Details. This is a third modification of the borneensis 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. nereis, III.2 is lengthened, IV .1 shortened; the tail is extremely short. The general size of the animal is slightly increased. Plagiopatagium inserted 1-3 111111. above the ankle-joint. Colour. <3 ad., Penang ; teeth unworn ; skin.-General impression : reddish brown above; under side much lighter, contrasting 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. borneensis. This peculiarity * The tip of the ears and the posterior nose-leaf are damaged; forearms broken. |
