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Homalopteroides avii, new species, is described from the Rajang River basin, Sarawak, Malaysian Borneo. It is distinguished from all other species of Homalopteroides by a wider gape of 28.5–33.3% HL vs. 22.3–24.2% for H. wassinkii, 20.0–28.4% for H. modestus, 19.1% for H. rupicola, 19.1–27.3% for H. smithi, 20.0–23.2% for H. stephensoni, 20.2–26.9% for H. weberi, 18.4–26.0% for H. tweediei, 17.3% for H. indochinensis, 17.4–21.2% for H. nebulosus, and 18.0–19.0% for H. yuwonoi. It is further distinguished from species of Homalopteroides by the presence of a lateral cephalic stripe vs. absence in H. modestus, H. rupicola, H. smithi, H. tweediei, H. nebulosus, and H. yuwonoi; deeper caudal peduncle, 10.1–10.9% SL, vs. 8.4–9.0% for H. wassinkii, 8.7% for H. rupicola, 7.7–9.1% for H. smithi, 6.1–6.6% for H. stephensoni, 6.7–8.0% for H. weberi, 8.0–9.4% for H. tweediei, 9.3–9.8% for H. nebulosus, 8.7 …