Definition of the Ichthyurus feae species group (Cantharidae, Chauliognathinae, Ichthyurini), with descriptions of three new species from China

A cantharid species group consisting of the species morphologically similar to Ichthyurus feae Gestro, 1891 is defined. The I. feae species-group is characterized by the middle-sized and relatively stout body, mesofemora moderately or strongly swollen and with several denticles in male, while normal in female; terminal abdominal tergite strongly ridged along ventro-lateral margins in male, with slender and horn-shaped lateral projections in both sexes; terminal abdominal ventrite greatly reduced in male, with proctiger and paraproct completely exposed, while well developed and rounded, dentated at posterior margin in female. It contains a total of nine species, including I. feae Gestro, 1891 (=I. lii nom. nov. for I. laosensis Li et al., 2014 syn. nov.), I. longicauda Gestro, 1891, I. nigromaculatus Gestro, 1891, I. quadrimaculatus Gestro, 1888, I. melanospilus Gestro, 1892, I. salvazai Pic, 1943 (=I. bernardi Li et Gao, 2015 syn. nov.), I. gracilicauda sp. nov., I. multidentatus sp. nov. and I. hainanensis sp. nov. The new species are all discovered from China, and I. feae and I. salvazai are firstly recorded to China and redescribed. These species are illustrated with habitus, genital segments of both sexes, aedeagi and internal genitalia of females. In addition, a distribution map and an identification key to all species of the I. feae species-group are provided.