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

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 M1, M2 and apex of A1 evanescent or somewhat distinct. Abdomen shining black. Terminalia with tergite 8 somewhat short with distal sinus ( Figs. 5 , 17 , 29 , 36 ). Epandrium with anterodorsal and posterodorsal lobes of same height ( Figs. 6 , 18 , 30 , 37 ). Hypandrium with variable setae, with apex narrow ( Figs. 7 , 19 ) or wide ( Figs. 31 , 38 ). Cercus divided into two lobes (see Rafael & Cumming 2004) and an additional distinct median membranous lobe between them ( Fig. 6 ); anterior cercus wide or narrow, connected anteriorly and medially by large flat cercal expansion; posterior cercus elongated. Phallus ( Figs. 7 , 19 , 31 , 38 ) as long as hypandrium, with apical portion of endophallus slightly projected beyond sheath ( Fig. 38 ). Ejaculatory apodeme tetralamelar ( Fig. 7 ).

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. 25 ) with long duct and rounded receptacle.

Figures

FIGURES 1 – 11. Macrostomus inflatus, sp. nov. 1 – 7, paratype male. 1, fore leg; 2, mid leg; 3, hind leg; 4, wing; 5, tergite 8, dorsal view with right setae omitted; 6, terminalia, lateral view (epandrium electronic gray colored); 7, hypandrium and phallus, lateral view; 8 – 11, paratype female. 8, tergite 8, 10 and cercus, lateral view; 9, tergite 8, dorsal view; 10, sternite 8, ventral view; 11, genital fork, ventral view. Scales: 1 – 3 = 0.5 mm; 5 – 10 = 0.2 mm; 11 = 0.1 mm. Abbreviations: AC, anterior cercus; AL, anterior lobe of epandrium; CE, cercus; EP, epandrium; MC, median cercus; PC, posterior cercus; PL, posterior lobe of epandrium; St, sternite; T, tergite.

FIGURES 12 – 19. Macrostomus limbipennis (Bezzi), lectotype male. 12, left fore leg, posterior view; 13, left mid leg, anterior view; 14, left hind leg, anterior view; 15, right wing; 16 – 19, Peruvian male specimen; 16, wing; 17, tergite 8, dorsal view with right setae omitted; 18, terminalia, lateral view; 19, hypandrium and phallus, lateral view. Scales: 12 – 14 = 0.5 mm; 17 – 19 = 0.2 mm.

FIGURES 26 – 31. Macrostomus nigriventris (Macquart), holotype. 26, right mid leg, posterior view; 27, left wing; 28, apex of medial lobe of cercus; 29, tergite 8, dorsal view with right setae omitted; 30 terminalia, lateral view, setae omitted; 31, hypandrium and phallus, lateral view, setae broken, insertion indicated. Scales: 26 = 0.5 mm; 28 – 31 = 0.2 mm.

FIGURES 32 – 38. Macrostomus nitidus, sp. nov. 32 – 35, paratype male from Goiás, Brazil; 32, left fore leg, posterior view; 33, left mid leg, anterior view; 34, right hind leg, anterior view; 35, wing; 36 – 38, holotype male; 36, tergite 8, dorsal view, right setae omitted; 37, terminalia, lateral view; 38, hypandrium and phallus, lateral view. Scales: 32 – 34 = 0.5 mm; 36 – 38 = 0.2 mm.

FIGURES 20 – 25. Macrostomus limbipennis (Bezzi), 20 – 25, Peruvian female specimen; 20, wing; 21, tergite 8, 10 and cercus, dorsal view; 22, idem, lateral view; 23, idem, except cercus, ventral view; 24, genital fork and genital chamber; 25, oviduct and spermathecae. Scales: 21 – 23 = 0.2 mm; 24 – 25 = 0.1 mm.