MAMMALS OF THE NATUNA ISLANDS II5 



matic breadth 53 instead of 45), and the braincase is more conspicu- 

 ously ridged for muscular attachment. That part of the braincase im- 

 mediately above posterior root of zygoma is more conspicuously inflated. 

 Otherwise I can detect no salient differences in the skulls of the two 

 animals. 



Teeth. — The teeth are uniformly larger than those of Tragtdus 7zi- 

 gricaiis., but in form they present no charactei^s of importance. As 

 compared with T. canescens the premolars both above and below are 

 conspicuously more robust, a character in which the Bunguran animal 

 agrees with the Bornean form of Tragtdus napu. 



Measurements . — External measurements of type : total length 647 ; 

 head and body 571 ; tail vertebrae 76 ; hind foot 146 ; hind foot with- 

 out hoofs 128. Average and extremes of five adults from the type 

 locality : total length 643 (628-673) '•> ^'^^^^ '"^nd body 566 (558-584) ; 

 tail vertebra 77 (70-S9) ; hind foot 142 (140-146) ; hind foot without 

 hoofs 126 (124-128). 



Cranial measurements of type: greatest length 114; basal length 

 107; basilar length 100; occipito-nasal length 106; length of nasals 

 32 ; diastema 13 (9) ;^ zygomatic breath 52 (46) ; least interorbital 

 breadth 33 (28) ; greatest breadth of braincase above base of zygomata 

 38 (33) ; mandible 91 (78) ; maxillary toothi-ow (alveoli) 38 (34) ; 

 mandibular toothrow (alveoli) 44 (39) ; anterior upper premolar 

 7x3.8 (6.4x3) ; middle lower premolar 7.2x3 (5.8x2.4). 



Weight. — Weight of type 3.8 kg. ; of two other males 3.6 kg. each. 

 Two adult females weigh respectively 3.6 kg. and 4.2 kg. 



Speci?nens examined. — Six, all from the type locality. 



Remarks. — Trao-ulus bunoruranensis is so distinct from the other 

 known species as to require no detailed comparisons. 



TRAGULUS sp. 



Two specimens from Sirhassen Island are too immature for deter- 

 mination. Appai'ently they represent a member of the napu group, 

 allied to that occurring in Borneo. The throat markings show no ap- 

 proach to those of Tragulus bungtiraneJisis. 



TRAGULUS JAVANICUS (Gmelin). 



1894. Tragidus Javanicus Thomas and Hartert, Novitates Zoologicse, i, 

 p. 660. September, 1864 (Bunguran). 



1895. Tragulus jai/aniciis TnomAS and Hartert, Novitates Zoologicae, 11, 

 p. 492. December, 1895 (part, specimens from Bunguran). 



Six specimens from Bunguran. 



'Measurements in parentheses are those of an adult male topotjpe of Tragulus 

 nizricans. 



