64 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



TRAGULUS NAPU BORNEANUS (Miller). 



1902. Tragulus borneanus Miller, Proc. Biol. Soc. Wash., vol. 15, p. 174, 

 August 6, 1902. 



1907. Tragulus borneanus, Lyon, Proc. U. S. Nat. Mus., vol. 33, p. 550, Decem- 

 ber 24, 1907. 



Doctor Abbott has collected thirty specimens of Tragulus of the 

 napu group in Borneo and on the large Pulo Laut. A careful com- 

 parison of these with a large number of specimens from various 

 localities in Sumatra, the type-locality of napu, shows that the 

 Sumatran and Bornean napus are almost identical in point of size, 

 color, and cranial characters. The Bornean animal averages a very 

 little smaller in most external and cranial measurements. (See table 

 of measurements, p. 66.) At the same time the throat markings are 

 slightly darker and the collar slightly wider than they are in typical 

 napu. These differences, however, are very slight and not at all 

 constant, and it is only possible to identify with certainty a little over 

 half the specimens in each series. The specimens from Pulo Laut 

 average slightly smaller in their cranial measurements than do those 

 from Borneo proper, but not enough to justify their recognition as a 

 distinct race. Externally there are no differences. Mr. Gerrit S. 

 Miller, jr., 1 has lately intimated that the Bornean napu would prove 

 to be very closely related to if not identical with the Sumatran one. 

 The following localities are represented in Doctor Abbott's series: 

 Kapuas River, 3 ; Sempang River, 2 ; Matan River, 4 ; Kendawangan 

 River, 3; Saratok River, 1; Pamukang Bay, 4; Pulo Laut, 13. 



(For measurements of the adults of this series, together with those 

 of the original series of Tragulus borneanus and of Sumatran napus, 

 see table, p. 66.) 



TRAGULUS SEBUCUS, new species. 



Type.— Skin and skull of adult male; Cat. No. 151810, U.S.N.M.; 

 collected on Pulo Subuku, off southeastern Borneo, January 4, 1908, 

 by Dr. W. L. Abbott. Original number, 5736. 



Diagnostic characters. — A small member of the napu group, similar 

 in size and color to Tragulus pretiellus Miller 2 of Pulo Bakong, Rhio- 

 Linga Archipelago, but blacker above and with posterior pair of dark 

 throat markings almost clear blackish instead of mixed blackish and 

 ochraceous. 



Color. — Upper parts of body, a mixture of black and ochraceous, 

 the former in excess; sides of body similar, but the ochraceous light- 

 ening to ochraceous buff, or buff; under parts of body white, but much 

 suffused in the middle line with pale ochraceous buff, this latter color 

 also forming a fairly well defined line between the color of the sides and 



' The Mouse Deer of the Rhio-Linga Archipelago: A Study of Specific Differentiation under Uni- 

 form Environment. Proc. U. S. Nat. Mus., vol. 37, p. 4, September 1, 1909. 

 2 Proc. U. S. Nat. Mus., vol. 31, p. 253, September 11, 1906. 



