Abstract
Two new species of the genus Tisis Walker, T. thaiana sp. nov. and T. asterias sp. nov., are described from Thailand. Photos of imagos and illustrations of the male and female genitalia of the new species are provided. Tisis elegans (Snellen, 1903), which was described from Indonesia, is illustrated for the first time with its imago, male genitalia, and some taxonomic notes ; a lectotype of the species is designated.