Two new species of the genus Longipenis Wu (Lepidoptera: Lecithoceridae), L. paradeltidius M. Wang and Xiong, sp. nov. and L. dentivalvus H. Wang and M. Wang, sp. nov. are described from South China. Longipenis paradeltidius is very similar to L. deltidius Wu in external morphology, but can be easily distinguished from the latter by M3 free from CuA1 in the hindwing and cornutus as long as 2/3 length of aedeagus. Longipenis dentivalvus differs from the 2 preceding species by uncus not apically forked. Adults, male genitalia, and wing venation are illustrated. A key and a distribution map of the species are given. The type specimens are deposited in the Department of Entomology, South China Agricultural University, Guangzhou, China.