346 Mr. R. I. Pocock on gie 



Hapalemur, Geoff r. Prolenmr, Gray. 



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



rate iuner lobe ; m^ and m"^ with form, with rounded inner lobe ; 



simple cinguluni, without accessory m^ and 771^ with bilobate cingulura^ 



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



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



grooved posteriorly. 

 Legs shorter ; skull about six- I-^egs longer : skull about two- 

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



On the Species of Hapalemur, 



When Hapalemur was instituted two species were assigned! 

 to it by Geoffrey — namely, grisetis and olivaceus. Tiie latter 

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

 of the lower jaw. Most subsequent authms 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 ^?VAe«,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 grey 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 the 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. yrisciis the skull measures 73 mm. 

 and the femur 90 ; in P. simus 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, 

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

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

 figure indicates. Probably the skull would have increased in length 

 proportionately much more than the femur. 



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

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

 generic sense. 



