Macrostomus limbipennis

Rafael, José Albertino & Cumming, Jeffrey M., 2012, Revision of the genus Macrostomus Wiedemann (Diptera, Empididae, Empidinae). III. The limbipennis species-group, Zootaxa 3361, pp. 45-55: 46

publication ID 10.5281/zenodo.281632

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Macrostomus limbipennis


Macrostomus limbipennis  species-group

Description. Male. Head dichoptic; frons shining black, as wide as or slightly wider than anterior ocellus width; face as broad as frons, slightly gray pruinose at apex; one or two pairs of ocellar setae, posterior pair weaker when present; postgena sometimes with setae as strong as dorsal thoracic setae; flagellum with 1 or 3 flagellomeres. Thoracic chaetotaxy: 3 pairs of dorsocentrals; 1 postpronotal stout and 1–3 minute; 1 supra –alar presutural; 1 supra –alar postsutural; 1 postalar strong and 1 minute; 2 notopleurals, posterior stout; 2 pairs of scutellars, outer pair weaker; 2–4 antepronotals; 1–4 proepisternals weak or as strong as dorsal thoracic setae; 3–10 katatergitals. Fore and mid tibiae with some setae slightly stronger, sometimes absent on fore tibia; hind femur with anterior setae at base and apex, or absent and 1–2 longer anteroventral setae at distal third; hind tibia with 3–5 longer dorsal setae; hind tarsomere 1 with 1 longer dorsal seta. Wing brown infuscated on costal and distal margin to almost entirely hyaline; pterostigma slightly darker; cell dm elongate, slightly acute to truncate; veins M 1, M 2 and apex of A 1 evanescent or somewhat distinct. Abdomen shining black. Terminalia with tergite 8 somewhat short with distal sinus ( Figs. 5View FIGURES 1 – 11, 17View FIGURES 12 – 19, 29View FIGURES 26 – 31, 36View FIGURES 32 – 38). Epandrium with anterodorsal and posterodorsal lobes of same height ( Figs. 6View FIGURES 1 – 11, 18View FIGURES 12 – 19, 30View FIGURES 26 – 31, 37View FIGURES 32 – 38). Hypandrium with variable setae, with apex narrow ( Figs. 7View FIGURES 1 – 11, 19View FIGURES 12 – 19) or wide ( Figs. 31View FIGURES 26 – 31, 38View FIGURES 32 – 38). Cercus divided into two lobes (see Rafael & Cumming 2004) and an additional distinct median membranous lobe between them ( Fig. 6View FIGURES 1 – 11); anterior cercus wide or narrow, connected anteriorly and medially by large flat cercal expansion; posterior cercus elongated. Phallus ( Figs. 7View FIGURES 1 – 11, 19View FIGURES 12 – 19, 31View FIGURES 26 – 31, 38View FIGURES 32 – 38) as long as hypandrium, with apical portion of endophallus slightly projected beyond sheath ( Fig. 38View FIGURES 32 – 38). Ejaculatory apodeme tetralamelar ( Fig. 7View FIGURES 1 – 11).

Female. Head dichoptic; frons wider than anterior ocellus width; face narrower than frons, approximately half of anterior ocellus width. Legs with no pinnate scales; hind tarsomere 1 with one dorsal setae. Wing slightly wider than in male, usually more infuscated at costal and distal margin. Terminalia less shining and more gray pruinose than preabdomen. Tergite 8 elongate. Sternite 8 usually with median large sinus, laterally with ventral constriction. Genital fork with short to indistinct lateral arms. Spermatheca ( Fig. 25View FIGURES 20 – 25) with long duct and rounded receptacle.