Four new species of the genus Otacilia Thorell, 1897 from Hunan Province, China (Araneae, Phrurolithidae)

Four new species of the genus Otacilia Thorell, 1897 are reported from Hunan Province, China: Otacilia hippocampasp. n., Otacilia yangmingensissp. n., Otacilia curvatasp. n., and Otacilia submicrostomasp. n. All new species are described based on both sexes. In addition, the 55 known Otacilia species are divided into four species groups.