Abstract: Material of the Late Permian Dashankou fauna was collected from a quarry at Yumen, Gansu, Northwest China. Significance and composition of the fauna, stratigraphical and lithological characters of the fossil — bearing beds have been previously demonstrated in the several papers (Cheng et al., 1996; Li and Cheng, 1995; Cheng and Ji 1996). Based on some excellent preserved specimens, the second genus of Dinocephalia in the fauna, following the first one, Sinophoneus Cheng and Ji, 1996, is described in the present paper.

摘要： 记述了恐头兽类一新属种利齿狭头兽(Stenocybus acidentatus gen. et sp. nov.)。它以高而窄的头骨，轻巧的结构，大的眼孔，小的颞孔，三角形的上颌骨有别于所有已知的恐头兽类。它的门齿结构，及出现在头骨顶面容纳下领收肌的凹陷显示了与安泰龙科( Anteosauridae)之间的密切关系。但其狭窄的头骨，大而侧扁的犬齿，及较为长大、侧扁、具边缘锯齿的犬齿后齿表明它代表一个新科，而且是恐头兽类中最为原始的科。