miller] seventy new Malayan mammals 55 



front legs like face. Underparts, shoulder stripes, and inner surface 

 of legs, clear tawny-ochraceous, the hairs on the chest and throat 

 slaty at base. Feet and ears dusky, the former distinctly darker 

 than legs. Tail light ferruginous, heavily clouded above with 

 blackish brown at base and near tip. The second specimen shows 

 no marked variation from the type. 



Skull and teeth. — The skull and teeth closely resemble those of 

 Tupaia splcndidula, but are distinctly larger throughout. 



Measurements. — External measurements of type : total length, 

 345; head and body, 200; tail vertebrae, 145; hind foot, 44 (42). 

 External measurements of adult male from type locality: total 

 length, 360; head and body, 210; tail vertebrae, 150; hind foot, 

 46 (44). 



Cranial measurements of type: greatest length, 53 (50) ;^ basal 

 length, 49 ( — ) ; basilar length, 46 ( — ) ; palatal length, 28 (26) ; 

 diastema, 3.4 (3.4) ; breadth of palate at middle of diastema, 5.6 

 (5.6) ; breadth of palate between middle molars, 10 (9) ; least inter- 

 orbital breadth, 15.6 (14.8) ; zygomatic breadth, 25.4 (25) ; breadth 

 of braincase above roots of zygomata, 20 (19) ; maxillary toothrow 

 exclusive of incisors (alveoli), 19 (19) ; mandible, 35 (34) ; man- 

 dibular toothrow exclusive of incisors (alveoli), 19.4 (19). 



Specimens examined. — Two, both from Bintang Island. 



Remarks. — The discovery of this treeshrew is of unusual inter- 

 est, as it greatly extends the range of the group to which the species 

 belongs. Hitherto three members have been known, Tupaia 

 splendidula Gray from Bunguran Island, T. liicida (Thomas) 

 from Pulo Laut, North Natunas, and T. chrysomalla Miller from the 

 Anambas. The relationship of Tupaia castanea to these may be 

 understood from the following key : 



Upperparts light (approximately the ferruginous of Ridgway). 



Head, neck, and shoulders paler than back ; feet not darker than legs. 



Tupaia lucida. 

 Head, neck, and shoulders not paler than back; feet darker than legs. 



Tupaia chrysomalla. 

 Upperparts dark (approximately the chestnut of Ridgway). 



Underparts buff; total length about 320; hind foot about 41 (39). 



Tupaia splcndidula. 



Underparts tawny-ochraceous; total length about 350; hind foot about 



45 (43) Tupaia castanea. 



The distribution of these treeshrews is diffictilt to understand. 

 They are unknown on the mainland of the Malay Peninsula or on 

 any of the larger islands ; but Pulo Bintang is distant from the 



1 Measurements in parenthesis are those of an adult female Tupaia 

 splendidula from Bunguran Island, North Natunas (No. 104,714). 



