A revision of the genera and species of the Neotropical family Mesembrinellidae (Diptera: Oestroidea) Author Whitworth, Terry L. Author Yusseff-Vanegas, Sohath text Zootaxa 2019 2019-08-26 4659 1 1 146 journal article 25918 10.11646/zootaxa.4659.1.1 0cbe0b8e-2019-4f5a-8336-2d4d9fcd8bf6 1175-5326 3377239 57309E14-0330-4ED7-BCDA-355EE6618215 Key to species of the M. spicata species-group 1. Disc, rim and fringe of setae of upper and lower calypters white; anterior spiracle yellowish. Male with short posterior projections medially on ST5 ( Fig. 245 ); epandrium, cerci and surstyli distinctive, as in Figs 27–28 ; female terminalia distinctive, as in Fig. 289.......................................................................... M . mexicana sp. nov. - Discs of upper and lower calypters light tan to brown with dark rim and brown fringe; anterior spiracle brown [ M. spicata ] or yellow [ M . guaramacalensis ]. Male with long projections medially on ST5 [ M. spicata ], [condition unknown in M . guaramacalensis ]; female terminalia distinctive, Figs. 288, 290........................................................ 2 2 Anterior thoracic spiracle brown; T4 without marginal row of stout setae in both sexes; male with the rear margin of ST5 with pair of long projections midway ( Figs. 12 , 246 ); female T6 of RV shape................................... M. spicata - Anterior thoracic spiracle yellow; T4 with marginal row of stout setae; [condition of ST 5 in male unknown]; female terminalia distinctive; T6 of WU shape ( Fig. 288 ).............................................. M. guaramacalensis sp. nov.