Noteridae, Dytiscidae (Coleoptera) from Gabon (eighth part). Monts de Cristal. This work concerns the Coleoptera Hydradephaga collected in eight localities of Monts de Cristal (Republic of Gabon) included locality of Tchimbélé into the National Park of Monts de Cristal in years 2006 - 2010; altogether 76 species are listed (3 Noteridae and 73 Dytiscidae) of which 51 species found in the Park. The authors describe two new species: <em>Copelatus angouei</em> (group <em>consors</em>, sensu Guignot, 1961, distinguishable from other species of group by small size, the robust conformation, the upper side clearly microreticulate covered by fine and thick punctuation which give it an opaque look and by characteristic penis), <em>Copelatus nguemai</em> (group <em>irinus</em>, subgroup <em>assimilis</em>, sensu Guignot, 1961, related to assimilis Régimbart, 1895, distinguishable by longer spine of metatibia clearly curved at third apical in both sexes and by characteristic penis) and one new subspecies: <em>Copelatus lasckonyi tchimbelensis</em> (group <em>irinus</em>, subgroup <em>irinus</em>, sensu Guignot, 1961, characterized by very small size, by narrowed profile of the body from shoulders in some specimens and by the upper side finely microreticulate, penis, very characteristic, is identical to typical form). The examination of two sintypes of <em>Copelatus variegatus</em> Régimbart, 1895 (group <em>erichsoni</em>, subgroup <em>atrosulcatus</em>, sensu Guignot, 1961) of Muséum Nationale d’Histoire Naturelle of Paris and of specimens of related species of the Museums of Tervuren and Bruxelles permitted the determination of the specimens of <em>C. variegatus c</em>ollected during research and the redescription of the species known till now by the two sintypes (here respectively designate lectotype and paralectotype); meanwhile a new species has been identified: <em>Copelatus mendax</em>, belonging to same group and subgroup of <em>C.</em> <em>variegatus</em>, misidentified with veritable <em>C. variegatus</em>. Some <em>taxa</em> of aquatic macroinvertebrates (Hexapoda, Malacostraca, <em>Clitellata</em> et Mollusca) in the zone collected and determined by a Researcher of IRAF (CENAREST, Gabon), Blaise Mboye Rollinat, who had participated in mission 2010, are furnished. Observations on some of the collected species and some ecological data of the biocenoses that populate the zone and some considerations on aquatic Coleoptera habitats are presented. The name of the species <em>Copelatus efoutensis</em> Bilardo & Rocchi, 1995 is amended in efotensis<em>.</em> <em>Hydrovatus senegalensis</em> Régimbart, 1895 and <em>Uvarus barombicus</em> Bilardo, 1982 are signalled for the first time of Gabon.
Two new species and one new regional record of Indonemoura from Guangxi, China, with additions to larval characters (Plecoptera, Nemouridae)
