NO. 1494. NOTES ON THE SLOW LEMURS— LYON. 583 



Skull and teeth. —Skull large, tempoi'al ridges of the type forming 

 a sagittal crest, although in the figure they have not yet met. Upper 

 incisors two on a side. 



Measurements. — See table, page 537. 



Specimens e.ramined. — None. 



RemarJis. — This species is usually regarded as the same as Nycticebus 

 soucang.^ but the descriptions and figures of the two certainly make 

 them appear distinct. Not much can be determined until good series 

 from the type localities are examined. 



NYCTICEBUS MALAIANUS (Anderson) . 



1881. N[/c(icebii.s tardlgradvs var. malaiana Anderson, Catalogue Mammals Indian 

 Museum, I, p. 95. 



Distrihution. — Mala}^ Peninsula and the coast regions of Sumatra. 



Diagnostic eharcictcrs. — Size small, face markings prominent, tem- 

 poral ridges forming a crest in old age, audital and mastoid Inilltie 

 moderately inflated, upper incisors usually two on a side. 



Color. — General color of the upper parts ranges in difl'erent speci- 

 mens from wood brown to a dark ochraceous huff; more or less frost- 

 ing is caused by the subterminal white band of the long hairs. The 

 dorsal stripe usually widest over the shoulders may extend the whole 

 length of the back or gradually disappear in the lumbar region. In 

 color it varies from a rich, deep brown similar to seal brown to a dark 

 tawny. Face markings are conspicuous and concolor generally with 

 the dorsal .stripe. Underparts dirty pinkish or cream buff', the slaty 

 bases of the hairs showing through. 



Skull and teeth. — Temporal ridges meet to form a sagittal crest in 

 old age. Upper incisors four in the j-oung and usuall}' in the adult, 

 though they may be reduced to three or two; audital and mastoid 

 bulla' smooth, rounded, and moderately inflated. 



Measiirernents. — See table, page 637. 



SjjecimeJh'^ e.ramived. — Seven skins with skulls, five from the Malay 

 Peninsula and two from the west coast of Sumatra, and one alcoholic 

 from west coast of Sumatra. 



Remarks. — One specimen. Cat. No. 84389, U.S.N.M., from Trong, 

 Lower Siam, has a skull differing considerably from the others of the 

 series. Its brain case is much depressed and the outer and upper walls 

 of the orbit stand out and up from the rest of the skull much more 

 than they do in the other specimens. The two Sumatrau specimens, 

 one from Tapanuli Ba}" and the other from Tarussan Bay, I am unable 

 to associate with 2\^yGticthufi Jillleri Stone and Rehn, which is a slightly 

 larger animal and has less inflated and more furrowed bulhv. 



