Abstract: Our observations on characters of leaf epidermis, lemma, palea etc. in the genera Acroceras Stapf (many species), Neohusnotia tonkinensis (Balansa) A. Camus (the type of Neohusnotia), Setiacis diffusa (Chia) S. L. Chen & Y. X. Jin (the type of Setiacis), Lasiacis divaricata (L.) Hitchc. (the type of Lasiacis^[4]) and Psilochloa pilgerana (Schweick.) Launert (the type of Psilochloa^[4]) in Subtribe Paspalinae^[1] Keng& Keng f. show that Setiacis diffusa differs from the others by several characters, which merits establishing a new genus—Setiacis S. L. Chen & Y. X. Jin in this subtribe^[1]. The Latin description of the new genus is given in this paper.

Key words: Acroceras, Neohusnotia, Setiacis, Lasiacis, Psilochloa