Review of the Hemiosus Sharp and Derallus Sharp of North America, Central America, and the Caribbean (Coleoptera: Hydrophilidae: Berosini) Author Short, Andrew Edward Z. Author Torres, Phillip J. text Zootaxa 2006 1369 1 17 journal article 10.5281/zenodo.174866 15363d41-dba5-4484-addb-9734f619bcf1 1175-5326 174866 7675CC72-B6D3-4EF6-B2EB-FE37BD42CEC1 Key to the Hemiosus Sharp exclusive of South America 1 . Pronotum entirely iridescent black ( Figs. 1–2 ). Elytra with distinctive black maculae of varying sizes ( Figs. 1–2 ) ............................................................. H. maculatus Sharp - Pronotum with at least lateral margins testaceous ( Figs. 3–4 ). Elytra lacking large iridescent maculae............................................................................................................. 2 2 Pronotum with central iridescent black region reaching anterior margin medially ( Fig. 3 ). Aedeagus with median lobe very acutely pointed apically ( Fig. 5 ).......................... ....................................................................................................... H. selva Short, sp. n. - Pronotum with central iridescent black region not reaching anterior margin ( Fig. 4 ). Aedeagus with median lobe bluntly rounded apically ..................... H. exilis (LeConte)