568 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXIII. 



External and cranial measurements of Preshytis dirysomelas {Schlegel). 



I Collector's measurements taken in the flesh. 



b Skull only, no skin. 



PRESBYTIS CRISTATA (Raffles). 



1822, Siniia cristata Raffles, Trans. Linn. Soc. London, XIII. p. 244. (Type- 

 locality, Sumatra). 



There seems to be no essential differences between specimens of 

 Preshytis cristatairom Sumatra, Banka," and Borneo, as is so often the 

 case with other groups of species of mammals. Doctor Abbott 

 secured two skins with skulls. These specimens with their measure- 

 ments are: Cat. No. 142212 U.S.N.M., adult male, from Kwala 

 Pontianak, and Cat. No. 142213 U.S.N.M., an adult female from 

 SanwCTaii; head and body, 540, 530 mm.; tail 760, 660; hind foot, 

 174, 152; weight 14^ lbs. (6.577 kgms.), 13i lbs. (6.124 kgms.); basal 

 length of skull, 72, 65; front of canine to back of m'', 33, 30; zygomatic 

 width, 74, 68.7. 



As most of the writers on monkeys have paid but little attention 

 to the skull characters and devote considerable attention to the 

 physiognomy it may not be without interest to point out some of 

 the rather striking cranial differences between the Pi^eshytis chrys- 

 omelas and P. cristata groups of monkeys, which may be tabulated 

 thus : 



Preshytis cristala. 1 Preshytis chrysomelas. 



Anterior nares gradually tapering to a 

 point antero-inferiorly. 



Supercilliary ridge well marked. 



No well-marked arch under malo-max- 

 illary suture. 



Constriction behind ftrbits consider- 

 able. 



No prominent swelling of brain case just 

 beneath lambdoid suture. 



Palate longer. 



Rostrum more pronounced. 



Ramus of mandible deep, and angular 

 process enlarged. 



Anterior nares suddenly contracted to a 

 point antero-inferiorly. 



Supercilliary ridge barely indicated. 



A well-marked arch under malo-maxil- 

 lary suture. 



Constriction behind orbits less Well 

 marked. 



A well-marked swelling of l)raincase 

 just beneath lambdoid suture. 



Palate shorter. 



Rostrum less pronounced. 



Ramus of mandible shallow, and angular 

 process not unusually enlarged. 



"Lyon, Proc. U. S. Nat. Mus., XXXI, 1906, p. 607. 



