570 



PROCEEDINGS' OF THE NATIONAL MUSEUM. 



vol.. jcXxiil. 



HYLOBATES LEUCISCUS (Schreber). 



1800. Simia lenclsca Scuuebkr, Saiigthiere HuppL, pi. Jii B. No description 

 or locality. For date of this lAate see Sherbom, Proc. Zool. Soc. I-olidoii,189l, 

 p. 590. (The locality of the specimen from which the plate was made i^ given 

 by Matschie as northwestern Borneo, Sit/..-Ber. Gosellsch. natiirlorsch, 

 Freunde, Berlin, 1893-1891, pp. 60-62.) 



1876. Hylohates concolor SchleceI;,^ Mus. d'hist. nat. Paj-'s-Bas. Simiae, p. 20. 



1901. Ihilohntea leucisnis, Trouessart, Catalogns Mammalinm, Suppl., p. 5. 



Six .skins with skulls and one odd skull from tlu^ Landak and Kapuas 

 rivers. In point of color the six skins ao;ree remarkably well with 

 Schreber's plate of this species. The general color is a drab or smoke 

 gray. On the rump this color becomes lighter and has a buffy cast. 

 On one individual. Cat. No. 142178, U.S.N.M., the greater portion of 

 the body is of this lighter color. The underparts of the body are 

 lighter in color than the upper parts, except for a narrow collar of 

 about the same color as are the upper parts, extending from one axilla 

 to the other. The naked or nearly naked portions of the face are 

 blackish, as well as a narrow band of hair adjoining the naked portion. 

 This ill-defined blackish band is succeeded by a narrow^, hot very well 

 marked band, lighter and more buffy in color than the rest of the 

 head. The naked portions of the hands and feet are black, and in a 

 few specimens the hair on the backs of the fingers is somewhat darker 

 than the color of the arm. 



Exlcnud and cranial mrasiirements of Tlylohates leucisciis from ■western Borneo. 



"Collector's measurements. 



'' Skull only, very young, last teeth in place are the first permanent molars. 



[Only one sort of Gibbon was seen, H. leuciscus, common all along 

 the river except in the islands of the Delta. Some of the specimens, 



a Not of Harlan, Journ. Acad. Nat. Sci. Phila. V, 1827, p. 231, which was evidently 

 a young SijnipJialangus. Containing only its milk dentition it was almost as large as 

 adults of Hylobates leuciscus. 



