. Bulletin of the Natural History Museum Zoology. 104 SIEBERT AND TJAKRAWIDJAJA REMARKS. Sumatra materials appear to have a more rounded head, deeper body, and longer fins than specimens from Borneo. We attribute this to larger size of the Sumatra specimens studied, but further materials in the appropriate size range (smaller specimens from Sumatra and larger specimens from Borneo) may reveal the two populations to be different species. If so, a new name will be required for the Kapuas River species. Schismatorhynchos holorhynchos sp. nov. (Figs IB,3,5,6) Schismatorhynchus heterorhyn
. Bulletin of the Natural History Museum Zoology. 104 SIEBERT AND TJAKRAWIDJAJA REMARKS. Sumatra materials appear to have a more rounded head, deeper body, and longer fins than specimens from Borneo. We attribute this to larger size of the Sumatra specimens studied, but further materials in the appropriate size range (smaller specimens from Sumatra and larger specimens from Borneo) may reveal the two populations to be different species. If so, a new name will be required for the Kapuas River species. Schismatorhynchos holorhynchos sp. nov. (Figs IB,3,5,6) Schismatorhynchus heterorhynchus; Inger & Chin, 1962: 86 HOLOTYPE. USNM 325389 ( mm SI); Malaysia; Sarawak; confluence of Batang Balui and Batang Kerumo; 02°22'N 113°45'E; col. L. Parenti, K. Luhat, and A. Among; 3-VIII-1991; field no. LRP 91-28. Paratypes. USNM 346637 (12 including 1 cleared and counter stained, mm SI); data as for holotype. Non-type MATERIALS. Borneo (Kinabatangan River basin, Sabah, Malaysia) - FMMN 68548 (28, mm SI); small stream 1 mi. above Sungei Tabalin Besar, Sta. 1; col. R. Inger and Chin; 21 April 1956. FMNH 68549 (1, mm SI); Deramakot Camp, hill stream; col. R. Inger; 2 May 1956. FMNH 68550 (5, mm SI); Deramakot Camp, hill stream below waterfall; col. R. Inger and Chin; 2 May 1956. FMNH 68551 (1, mm SI); Deramakot Camp, stream below water fall; col. R. Inger; 3 May 1956. FMNH 68552 (30 of 147, ^ mm SI); Deramakot Camp; col. R. Inger and Chin; 8 May 1956. FMNH 94183 (1, mm SI); Deramakot Camp, hill stream; col. R. Inger; 2 May 1956. Borneo (Rejang River basin, Sarawrak, Malaysia) - USNM 325359 (2, mm SI); Baleh River, creek entering northern bank approx 5 km E of Sut River; 2°2'N 113°07'E; col. L. Parenti et at.; 25 Jul 1991. USNM 324978 (2, mm SI); Baleh River, stream entering river opposite Sekolah Negara Bawai; 2°0'N 113°03'E; col. L. Parenti etai; 24 Jul 1991. USNM 325387 (2
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