3i6 Mr. R. I. Pocock on the 



Hapahmur, Geofifr. Proleniur, Gray. 



form ; pm^ molariform, with quad- in ?ize and form ; pm^ not molari- 



rate inner lobe ; jh^ and m^ with form, with ronnded inner lobe ;- 



simple cingiilum, without accessory vi^ and m^ with bilobate cingulum,. 



cusp ; no trace of groove on the the posterior lobe cuspidate ; tlie 



inner cusp of these teeth behind. main inner cusp of these teeth 



grooved posteriorly. 

 Legs shorter ; sliull about six- Legs longer : skull about two- 

 sevenths the length of the femur *. thirds the length of the femur. 



On the Species of Hapalemur. 



When Hapnlemiir was instituted two species were assigned 

 to it by Geoffrey — namely, ^ruews and olivaceits. Tlie latter 

 was said to differ from the former in colour and in the shape 

 of the lower jaw. Most subsequent authors have concurred 

 in the specific identity of the two, and Milne-Edwards and 

 Grandidier, who had access to Geoffroy's specimens, called 

 olivaceus a variety of griseus ; and their coloured figures show- 

 that ^r*'ie».s is lighter in tint than olivaceus. Elliot, however, 

 admitted the two species because of the difference in colour 

 and the larger size of the skull in olivaceus. The inference to 

 be drawn from the literature, whether rightly or wrongly, is 

 that the two forms may represent distinct subspecies, or 

 possibly species, but that in any case they are closely related 

 and exhibit few, if any, constant cranial differences except of 

 size. 



The three skins in the Zoological Society's collection are 

 decidedly dark in tint, and may be described as dusky brown, 

 the hairs being dark bluish giey annulated with rusty brown 

 towards the tips. On the crown of the head the rusty brown 

 is more in evidence, but round the eyes and on tiie cheeks 

 it is less obvious. The underside is lighter than the upper. 

 In the small specimen, received in 1887, the belly and thighs 

 inside are bright buff, the throat grey. In the two others 

 the throat is darker and the belly dark grey washed with 

 brown. Provisionally I regard these skins as belonging to 

 one and the same species and race, and the colouring enforces 



• Judging from M.-Edwards's figures of the skeletons of H. griseus 

 and P. simus. For instance, in H. griseus the skull measures 73 mm. 

 and the femur 90 ; in P. siimis the skull is 81 mm. and the femur 120. 



In the Zoological Society's specimen of P. simus the femur is actually 

 a little longer, being 122 mm. to the head, whereas the skull is shorter, 

 namely, 75 mm. The skeleton, however, is that of an immature speci- 

 men, with the last molar teeth still buried in the bone, as Beddard's 

 figure indicates. Probably the skull would have increased in length 

 proportionately much more than the femur. 



Unfortunately the leg-measurements of II. schlegeli are unknown. 

 Hence the character above stated can only be used provisionally in a 

 freneric sense. 



