Revision of the genus Oedematopus (Diptera, Dolichopodidae) with the description of a new genus and a key to the Neotropical genera of Hydrophorinae Author Naglis, Stefan M. text Zootaxa 2011 2756 40 52 journal article 10.5281/zenodo.201012 355c8ea5-bed4-4acd-bfc3-89c9644677b2 1175-5326 201012 Key to tribes and genera of Neotropical Hydrophorinae 1 Arista apical; posterior mesonotum flattened (Aphrosylini)................................................... 2 - Arista dorsal or subapical; posterior mesonotum not flattened................................................. 4 2 Vertical setae positioned halfway between antennae and anterior ocellus......................................... 3 - Vertical setae positioned on level of anterior ocellus........................................ Paraphrosylus Becker 3 Fore basitarsus in males modified and shorter than tarsomere 2; acrostichal setae small and biseriate....................................................................................................... Thambemyia Oldroyd - Fore basitarsus in males not modified; acrostichal setae absent................................... Cymatopus Kertész 4 Crossvein dm-cu shorter than distal section of CuA; antennae and legs at least partially yellow (Thinophilini)................................................................................................ Thinophilus Wahlberg - Crossvein dm-cu equal or longer than distal section of CuA; antennae and legs usually dark (Hydrophorini)............. 5 5 Mesonotum with silvery white pruinosity; acrostichal setae absent; crossvein dm-cu parallel or at acute angle to posterior wing margin ( Figs. 1 A-D); vertical setae absent.................................................................. 6 - Mesonotum usually without silvery pruinosity; acrostichal setae usually present; crossvein dm-cu at distinct angle to posterior wing margin; vertical setae present....................................................................... 7 6 Crossvein dm-cu parallel to posterior wing margin ( Figs. 1 A–C); postvertical setae absent; male fore tarsomeres unmodified; cercus simple..................................................................... Oedematopus Van Duzee - Crossvein dm-cu at acute angle to posterior wing margin ( Fig. 1 D), short postvertical setae present; male fore tarsomeres mod- ified ( Fig. 6 ); cercus with two arms................................................... Oedematopiella gen. nov. 7 Proepimeron with ventral digitiform projection behind base of fore coxa; hind coxa with a strong lateral seta Liancalus Loew - Proepimeron without digitiform projection at base of fore coxa; hind coxa without strong lateral seta.................. 8 8 Anepimeron with tuft of fine hairs in front of posterior spiracle................................. Hydatostega Philippi Anepimeron bare in front of posterior spiracle............................................... Hydrophorus Fallén