Three additional new genera of acidocerine water scavenger beetles from the Guiana and Brazilian Shield regions of South America (Coleoptera, Hydrophilidae, Acidocerinae) Author Giron, Jennifer C. Department of Ecology & Evolutionary Biology, and Division of Entomology, Biodiversity Institute, University of Kansas, Lawrence, KS 66045, USA https://orcid.org/0000-0002-0851-6883 entiminae@gmail.com Author Short, Andrew Edward Z. Department of Ecology & Evolutionary Biology, and Division of Entomology, Biodiversity Institute, University of Kansas, Lawrence, KS 66045, USA text ZooKeys 2019 855 109 154 http://dx.doi.org/10.3897/zookeys.855.33013 journal article http://dx.doi.org/10.3897/zookeys.855.33013 1313-2970-855-109 F5A7AE8B38834CFD859FB2F3F9A079C0 F460A02DFFD1FB56FFF2FF94FFB2FFAC 3251190 Ephydrolithus ogmos sp. nov. Figs 6 A-D , 7H , 8 , 9A, B Type material. Holotype (♂): "BRAZIL: Bahia: Abaira ; 13.29053S , 41.90489W ; 1705 m; Pico do Barbado, W of Catoles ; vertical seep on rock; 26.ii.2018; leg. Benetti & team; BR18-0226-01C" (INPA). Paratypes (4): BRAZIL: Bahia : Same data as holotype (SEMC, 2 including DNA voucher SLE-1510; INPA, 2). Differential diagnosis. Ephydrolithus ogmos is easily distinguished from all the other known species by its well-defined striae along the posterior third of the elytra. Description. Body length 3.1-3.3 mm, width 1.8-2.0 mm. Body elongate oval, strongly convex (Fig. 6B ). General coloration brown, slightly paler along margins of pronotum and elytra. Posterior elevation of mesoventrite with well-developed spine, forming high anterior carina. Elytra with well-developed striae along posterior half and reduced serial punctures. Pro- and mesofemora covered with hydrofuge pubescence along basal half; metafemora with glabrous tibial grooves. Apex of fifth abdominal ventrite truncate. Aedeagus (Fig. 7H ) with basal piece 0.7 x the length of parameres; parameres nearly 0.7 x greatest width of median lobe, with outer margins slightly sinuate; apex of parameres rounded, obliquely directed; apex of median lobe widely acute. Etymology. Named with the Greek word ogmos meaning furrow, in reference to the well-defined elytral striae of the species. Distribution. Only known from the type locality, Pico do Barbado (Fig. 8 ). Life history. The type series was collected on a high-elevation seepage over a vertical cliff. The rock face had moss and algal growth on same areas (Figs 9A, B ).