New species and new records of predaceous midges in the genera, Schizonyxhelea Clastrier and Stilobezzia Kieffer from Mexico (Diptera: Ceratopogonidae) Author Huerta, Herón Author Grogan, William L. text Zootaxa 2017 4294 4 401 418 journal article 32636 10.11646/zootaxa.4294.4.1 f3e2e226-a609-453b-995f-b5bee31a5642 1175-5326 832774 AEE0A680-3206-4AFA-968D-5EC5313738D6 Key to adult Schizonyxhelea of Mexico (Males of S . guyana Clastrier and females of S . zoologica n. sp. are unknown) 1 Males ...............................................................................................2 - Females.............................................................................................5 2 Gonostylus with several crenulations on mesal surface.......................................... S . zoologica n. sp. - Gonostylus simple, without crenulations on mesal surface.....................................................3 3 Gonostylus with basal thumb-like appendage; wing membrane without macrotrichia beyond costa to wing tip................................................................................................. S . thomsenae (Wirth) - Gonostylus without basal thumb-like appendage; wing membrane with macrotrichia beyond costa to wing tip............ 4 4 Aedeagus with distal heavily sclerotized horn-shaped sclerite.................................... S . bulla (Thomsen) - Aedeagus without distal heavily sclerotized horn-shaped sclerite.......................... S. forattinii Wirth & Grogan 5 Wing membrane without narrow fringe of macrotrichia beyond the costa to wing tip................ S . thomsenae (Wirth) - Wing membrane with narrow fringe of macrotrichia beyond the costa to wing tip.................................. 6 6 Wing with 2 radial cells; costa long, costal ratio 0.65; two small ovoid spermathecae................. S . bulla (Thomsen) - Wing with 1 narrow radial cell; costa short, costal ratio 0.45–0.50; one large retort-shaped spermatheca.................7 7 Claws straight without bifid tips or hair-like basal tooth; 3rd palpal segment with only 1 capitate sensillum; costa very short, costal ratio 0.45................................................................. S. forattinii Wirth & Grogan - Claws with bent bifid tips and hair-like basal tooth; 3rd palpal segment with 3 captitate sensilla; costa short, costal ratio 0.50....................................................................................... S . guyana Clastrier