Hydraenidae of Madagascar (Insecta: Coleoptera) Author Perkins, Philip D. text Zootaxa 2017 2017-11-03 4342 1 1 264 journal article 31639 10.11646/zootaxa.4342.1.1 15799d2a-1968-4874-8100-452597d4e26b 1175-5326 1041066 2ACD54D2-3487-432D-9323-EEC131FE2E64 Key to the genera of Madagastrini 1. Elytral ridges carinate, strong, continuous; third carina (counting sutural carina as first), arcuate posteriorly and attaining elytral apices at or very near sutural angle; intercostal areas with two or three rows of punctures.......................... 2 -. Elytral ridges low and continuous or, if carinate, sometimes with interrupted sections; ridges or carinae not attaining elytral margin; areas between ridges with three to five rows of punctures or granules...................................... 4 2. Head with clypeus laterally widened, labrum and maxillary palpi short and held beneath overhanging clypeus; hydrofuge pubescence on abdominal ventrites reduced, less than first four ventrites plus anterior margin of fifth................... 3 -. Clypeus not widened, maxillary palpi larger, exposed; hydrofuge pubescence on first four abdominal ventrites and anterior margin of fifth; India ( Fig. 174 )............................................................... Gondraena Jäch 3. Pronotum with tuberculate carinae; posterior angles of pronotum deeply excavate; hydrofuge pubescence on first two abdominal ventrites; India........................................................................ Davidraena Jäch -. Pronotum non-carinate, with circular, flat, dense granules; posterior angles of pronotum not excavate; abdominal ventrites lacking hydrofuge pubescence ( Figs. 162 , 163 , 166 , 167 , 170 , 171 ); Madagascar.............. Menomadraena new genus 4. Prosternum with coxal cavities closed behind; mesoventrite intercoxal process with small tubercle ( Fig. 191 ); each elytron with four strong carinate ridges, the first of which is interrupted in one place; hydrofuge pubescence on first three ventrites and anterior margin of fourth; Madagascar................................................ Trinomadraena new genus - Prosternum with coxal cavities open behind; mesoventrite intercoxal process without tubercle; elytral ridges variable, low and continuous or if carinate with interrupted areas; hydrofuge pubescence variable, on first two ventrites and anterior margin of third or on first four and anterior margin of fifth; Madagascar.................................... Madagaster Perkins