DESCRIPTIONS OF SOME NEW SPECIES OF MONKEYS OF 

 THE GENERA PITHECUS AXD PYGATHRIX COLLECTED 

 BY DR. W. L. ABBOTT AND PRESENTED TO THE UNITED 

 STATES NATIONAL MUSEUM. 



By D. G. Elliot. 



The examples upon which the following species were based were 

 procured, with the exception of the type of Pygaihrix ultima, by 

 Dr. W. L. Abbott from the islands of the Eastern Archipelago. 



Genus PITHECUS. 



PITHECUS LAPSUS, new species. 



Macaco. phseura(not Miller) Lyon, Proc. U. S. Nat. Mus., vol.31, 1906, p. GOG. 



Type-locality. — Island of Banka, east of southern Sumatra. 



Type.— Cat. No. 124863, U.S.N.M. 



Geographical distribution. — Islands of Banka and Billiton. 



General characteristics. — Similar to P. phseura, but much darker; 

 rostrum shorter and narrower, premaxillse lengthened, protruding. 



Color. — Frontal streak black, conspicuous, broader than in /'. 

 phseura; top of head, upper parts of body, and outer side of arms and 

 thighs covered with hairs, pale drab at base and annulated on apical 

 half with black and tawny ochraceous; legs below knees gray, hairs 

 tipped with buff; cheeks, underparts and inner side of limbs buffy 

 smoke gray; hands similar to outer side of arms; feet yellowish gray: 

 tail blackish at base above, grading into gray at tip, beneath smoke 

 gray. 



Measurements. — Total length, 955 nun.; tail, 520; (Coll.) foot, 124; 

 (skin); skull, total length, 113.8; occipito-nasal length, 94.7; hensel, 

 80.2; zygomatic width, 76.2; intertemporal width. 37.5; palatal 

 length, 43.7; median length of nasals, 22.7: length of upper molar 

 series, 28; length of mandible, 83; length of lower molar series, 36.3. 



The color of this species is very different from P. pha ura Miller, is 

 much darker generally and not so yellow in tone, while the feet are 

 yellowish gray, quite different from the dark feel of its ally. The 

 skull also shows important differences, while the geographical distribu- 

 tion of the two forms would seem to negative the idea that they were 

 the same species. 



Proceedings U. S. National Museum, Vol. 38-No. 1751. 



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