A new species of Patania from the Hainan Island, China (Lepidoptera, Crambidae)

Patania clava sp. n. is described from the Diaoluo Mountain of Hainan Island, China. The new species is distinguished from its most similar congener, P. iopasalis (Walker, 1859), by the following features: wingspan 33.0–35.0 mm (vs. 21.0–30.0 mm), ventral cilia of the male antenna as long as the diameter of flagellomere (vs. 1/4), the thick finger-like gnathos (vs. the short broad sheet-like), a long thick needle-like cornutus stretching out from (vs. embedded in) a cluster of spicular cornuti near apex. Images of adult and genitalia of the new species are provided.