512 DR. A. GtJNTHER ON A ZOOLOGICAL [June 23, 



Lower incisors small, separated in the centre, the inner about half 

 the size of the outer, the combined diameters of those of each side 

 2 millim. Canines proportionally still shorter than in the upper jaw, 

 3'5 millim. from cingulum to tip behind: their basal ledge broad. 

 Anterior premolar very large, nearly filling up the space between the 

 canine and second premolar, its size in cross section nearly equal to 

 that of the canine. Molars smooth and rounded, as in the upper 

 jaw. Last molar in section about one-third the size of the anterior 

 premolar, and three quarters that of the last upper molar. 



Dimensions of the type, specimen a, an adult female in spirit : — 

 Head and body 210 milHm. ; head 61; muzzle 22; ear. above 

 crown 26, from notch at base 28 ; forearm 127 ( = 5"0 in.) ; thuml), 

 without claw, 43 ; index finger 90 ; tibia 62 ; calcaneum 21. 



Skull: — Basal length 52; greatest breadthSO ; supraorbital foramen 

 to tip of nasals 24*5 ; interorbital breadth 6'5 ; intertemporal breadth 

 5-0; breadth from tip to tip of postorbital processes 191 ; palate, 

 length 32, breadth outside first molar 16'0 ; length of first molar 5'0. 



It is unfortunate that of this new species the only specimens of 

 any use for description are females, since it might happen that, as is 

 sometimes the case in Pt. nicobaricus, while the females are wholly 

 black, the males have the usual yellow or orange tippet. It is 

 therefore much to be hoped that male specimens will soon be obtained 

 and the point settled. In any case, however, PL natalis is a very 

 well-marked species. From Pt, nicobaricus it may be distinguished 

 by its much smaller size and smaller shorter molars, and especially 

 by its much shorter and feebler canines — the latter ch.aracter, in fact, 

 distinguishing it from all the other allied species except Pt. lombocensis. 

 Pt. pselaphon, another wholly black species of about the same size, 

 a native of Benin, may be separated at once by its hairy legs, the 

 hind limbs being closely haired right down to the feet. Pt. gouldi, 

 also generally black, has a forearm 165 milUm. long, and has also 

 large teeth and long canines bearing no resemblance to those of the 

 present species. 



On the whole Pt. natalis seems to be most nearly allied to Pt. 

 lombocensis, Dobs.\ as yet only known from Lombock, which also 

 has similarly short canines and is of about the same size. That 

 animal, however, is of a dull light brown colour, with the neck pale 

 yellow. Its teeth, especially the anterior molar, are narrower and 

 lighter than those of Pt. melas ; the first lower premolar and the 

 last molars both above and below are much smaller, and the basal 

 ledges to the canines are decidedly narrower than in Pt. natalis. In 

 the skull, again, Pt. lombocensis has a shorter broader muzzle, greater 

 spread of zygomata, broader interorbital space, and larger postorbital 

 processes than the present species. Of course in comparing the 

 colours of these two species the question of sex again arises, as 

 the only known specimens of Pt. lombocensis are both males ; but 

 considering not only the differences in the skull and teeth, but also 

 the fact that even if the male of Pt. natalis have a yellow tippet, it 

 would in all probability have at least its head and body jet-black hke 

 ' Cat. Cbir. B. M. p. 34 (1878). 



