Abstract: Laogaochuan, the locality with rich chilothere fossils, is located about 60 to the northwest of Fugu County seat in Shaanxi Province. In this district, the Neogene strata located above the Mesozoic coal—bearing formation is 52m thick, all the which is underlying the loess. The Hipparion—fauna bearing chilothere fossils was collected from the lower and middle beds of the Neogene strata, with an age of 7.4— 5.3Ma B. P. based on paleomagnetic daüng, i. e. the late Late Miocene (MN12— 13) (Xue et al., 1995). A new species of Acerorhinus from this locality is described and discussed in this paper.