348 Mr. R. I. Pocock on the 



Sclileo-el's figure, and tliat the possibility of anotlier species 

 beiii"- concerned dawned npon him. Nevertheless, the short- 

 ness of the muzzle misled him apparently in the matter of its 

 apparent superior width. 



Both the literature, therefore, and the skulls in my 

 possession attest the existence of two well-marked species of 

 JIapalenmr — one exemplified by the small skull above referred 

 to, which ])robably belongs to the form Schlegel identified as 

 H. griseus, the otiier being the tine f/riseus of Geoffroy, which 

 has been well figured by Milne-Edwards and Grandidier. 

 The former species I propose to describe as new, taking the 

 skull in the Zoological Societj'^'s collection as the type. Since 

 the only other skull I have at hand is that of the specimen 

 determined, for reasons already stated, as olivaceus, I have 

 diagnosed the new species with special reference to olivaceus 

 rather than to griseus^ although the differences between it and 

 Milne-Edwards's figure of the skull of gr'iseus are almost as 

 well maiked. 



Hapalemur schlegeli, sp. n. 



P Hapaletnur griseus, Schlegel, in PoUeu & Van Dam, Rech. Faune de 

 Madag., Mamui. et Ois. p. 6, pi. vii, tigs. 4 a-d (skull). Nee H. gri- 

 seus, Is. Geoff. 



Skull (type) considerably shorter but relatively broader, 

 higher, and more arched antero-posteriorly along its upper 

 profile, and less hollowed between the postorbital processes, 

 than in H. olivaceus, the orbits relatively larger, with the 

 inferior edge much more salient, giving a strongly sinuous 

 curvature to the outline of the malar arch, and causing a 

 deeper groove along the outer surface of its suborbital 

 portion ; the upper surface of the muzzle more depressed and 

 curved, the upper portion of the maxilla compressed along 

 the nasal suture, the lateral edge of the anterior nares emai- 

 ginate in profile view, this orifice slightly higher than wide, 

 compresr^ed above. In H. olivaceus the muzzle and anterior 

 nares are not compressed above and the latter orifice is slightly 

 wider than high. The zygomatic arch and postorbital bar 

 are relatively stouter than in olivaceus ; the mastoid is inflated, 

 reducing the pai-occipital process, and the ujjper edge of the 

 zygoma is not continued as a crest back to tlie occiput as it 

 is in H. olivaceus, where the mastoid is not inflated but flat, 

 leaving the paroccipital processes salient. The basicranial 

 axis is more steeply inclined, so that the bullae and occipital 

 condyles are set considerably lower with reference to the 

 alveolar border of the maxilla than in olivaceus^. 



* This difference is not so marked between the skulls of H. schlegeli 

 and H, griseux, judging from M.-Edwards's figure of the latter. 



