NO. 1498. MAMMALS OF BANKA AND BILLITON— LYON. 583 



describe, but is easily appreciated in viewing the two forms. In the 

 fronto-nasal region and just posteriorly, on the upper surface of 

 the skull, is found a well-marked concavity in the Bornean animal, 

 which is lacking- in the one from Banka. The mandibular symphysis 

 measures on its upper aspect about 25 mm. in M. plelhavicus and 

 about 20 mm. in M. hancanus. The antero-posterior diameter of the 

 first lower premolar is greater in the Bornean animal than in the 

 one from Banka; the same differences are found in the lirst upper 

 premolars. 



Measurements. — For measurements of Banka Muntjacs and specimens 

 from Sumatra, Borneo, and the Malay Peninsula see table, page 5S4. 



Specimens examined. — Two adult females, skins and skulls. Cat. No. 

 121726, U.S.N.M., the type froniTanjong Bedaan, and Cat. No. 124752, 

 U.S.N.M., from Parmassan, the frontlets and antlers of five males 

 from Parmassan and one frontlet (with skin dried on) and antlers 

 from Buding Kampong, Billiton. 



Bema/'Ii.s: — Mnntlacas hancanus is at once distinguished by its smaller 

 size from J/, moschatus of Sumatra and from J ^ graudicornis of the 

 Malay Peninsula, from M. ■j)leiliaricus^'^ of Borneo, it is readily sepa- 

 rated by its brighter color, absence of a dorsal stripe, and b}^ well- 

 defined cranial characters. The single specimen from Billiton con- 

 sisting only of a pair of antlers, the frontlet and its dried skin is very 

 close to the Bankan Muntjac. The colors in the frontlet are bright 

 and well marked, and in size it agrees with the Banka specimens. 



« I have referred three specimens of Bornean Muntjacs in the United States National 

 Museum to this spet-ies. Two skins of females agree fairly well as to color with the 

 original description of M. j)leihark'its and possess a dorsal stripe though it is not well 

 marked and the antlers and frontlet of a male are about the same in size as the orig- 

 inal figure of M. pleiharicus (Kohlbrugge, Natuurkundig TijdschriftvoorNederlandsch 

 9th ser., IV, 1896, p. 192, plate facing p. 260.) I do not believe that much weight 

 can be placed on the shape of the antlers of M. pleiharicus for an adult male from 

 Tenasserin, Cat. No. 111969 U.S.N.M., has antlers and pedicles very similar to those 

 figured by Kohlbrugge. 



