Three new species of the subfamily Opisthocosmiinae from China (Dermaptera, Forficulidae), with new synonymies and combinations Author Sun, Meiling Author Li, Kai Author Liu, Xianwei text Zootaxa 2016 4109 3 359 371 journal article 39121 10.11646/zootaxa.4109.3.6 b850186c-256a-4292-b943-e58d2c578c62 1175-5326 266075 2C54621D-7DEC-4492-A41C-96036D85F566 Mesolabia Shiraki, 1906 Mesolabia Shiraki, 1906 : 12 Generic diagnosis. Size medium; body slender. Head tumid and smooth, suture distinct, antennae with 12 joints, first joint length almost equal to the distance between the antennal bases, fourth joint slightly longer than third and shorter than fifth. Pronotum slightly longer than broad, narrower than head; anterior and lateral margins straight, posterior margin rounded; prozona weakly tumid, median suture indistinct. Elytra smooth, not keeled, with weak inner anterior angle, exposing a scutellum; wings present or absent. Legs slender, first joint of hind tarsus as long as second and third together. Last abdominal tergite of male slightly transverse, pygidium more or less prominent, forceps bases widely separated, inner surface very flat, with sides forming a faint ridge and armed with sharp teeth and some granules. Female forceps simple, nearly touching at base. Two species of this genus are known from China . The species Mesolabia ? deprepaniensis (Kapoor et al ., 1971) from India may also belong to this genus. Type species: Mesolabia niitakaensis Shiraki, 1906 .