Genus Hainanphasma Ho, 2013: taxonomic notes and two new species from Hainan in China (Phasmida, Heteropterygidae)

Two new species of <i>Hainanphasma</i> Ho, 2013, <i>Hainanphasmalongiacuta</i> <b>sp. nov.</b> and <i>H.longidentata</i> <b>sp. nov.</b>, are described and illustrated based on specimens of both sexes from Hainan, China. The heads of <i>H.cristata</i> Ho, 2013, based on both sexes, and <i>H.diaoluoshanensis</i> Ho, 2013, based on females, are redescribed from new materials. The generic diagnosis of <i>Hainanphasma</i> is improved, and the distinction from <i>Orestes</i> Redtenbacher, 1906 is clarified. The male and egg of <i>H.diaoluoshanensis</i> are described and illustrated for the first time. A key to species of <i>Hainanphasma</i> is provided.