miller] seventy new MALAYAN MAMMALS ^f 



like that of its relatives and strongly suggesting Macacus nemes- 

 trinus. The nasal bones are fully as long as in Nasalis larvatus, 

 though their width is less and their anterior extremities probably 

 never form a distinct median projection. Among the nine skulls 

 that I have examined none shows any tendency toward the rudi- 

 mentary form of nasals characteristic of Presbytes and to an even 

 greater degree of Rhino pithecus. The interorbital region is rela- 

 tively longer and narrower than in any of the related genera, and the 

 orbits are better defined above, two characters that give the skull a 

 strong resemblance to that of Macacus. The facial profile is nearly 

 straight from forehead to middle of nares. The development of the 

 rostrum is intermediate between that of Nasalis and Presbytes, and 

 appears to be closely similar to that in the two species of Rhinopi^ 

 theciis whose skulls are known. The teeth do not differ appreciably 

 from those of the members of the related genera. Although the skull 

 agrees so closely with that of Nasalis the nose is very different, show- 

 ing no tubular elongation. As in Rhinopithecus the apertures of the 

 nostrils are directly on the surface of the very wide upper lip ; and 

 it is only the superior nasal margin that is lengthened to give the face 

 its snub-nosed aspect. While the structural characters of the head 

 are essentially a combination of those of the previously known 

 genera, the form of the body departs widely from that of other mem- 

 bers of the subfamily Preshytince, particularly in the shortness of the 

 arms and tail, and resembles the pig- tailed macaques. The limbs 

 are not as robust as in Macacus nemestrinus, but the tail is of about 

 the same relative length, and the ischial callosities are fully as con- 

 spicuous. Although distinct from each other and from Presbytes, 

 the genera Nasalis, Rhinopithecus, and Simias form a compact and 

 easily recognizable group. 



SIMIAS CONCOLOR sp. nov. 



(Plates XIV, XV, XVI) 



Type. — Adult male (skin and skull). No. 121,659, United States 

 National Museum. Collected on South Pagi Island, Sumatra, De- 

 cember 3, 1902, by Dr. W. L. Abbott. Original number, 2103. 



Characters. — Nose and teeth essentially like those of Rhinopithecus 

 roxellana and R. bieti as described and figured by Milne-Edwards. 

 Skull essentially as in A^asaHs larvatus but smaller, the rostrum less 

 produced, and nasal bones narrower. Size and general form about 

 as in Macacus nemestrinus; tail only one-third as long as head and 

 body, naked except for an inconspicuous tuft of hair at tip. General 

 color throughout dusky brown, the underparts darker than back. 



