Macrostomus inflatus, Rafael, José Albertino & Cumming, Jeffrey M., 2012

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 : 47-48

Macrostomus inflatus , sp. nov.

( Figs. 1–11 )

Diagnosis. Fore tarsomere 1 of male swollen dorsally. Wing entirely hyaline with inconspicuous pterostigma.

Description. Holotype male, previously preserved in alcohol; specimen somewhat discolored by alcohol action. Body length 2.6 mm; wing length 3.9 mm. Frons shining black, wider than anterior ocellus width. Face slightly narrower than frons, approximately as wide as anterior ocellus width. Ocellar tubercle slightly protuberant with 1 pair of ocellar setae. Postcranium black, gray pruinose. Antenna yellow, flagellum with one flagellomere.

Proboscis yellow. Palpus yellowish. Thorax shining black, gray pruinose; postpronotal and postalar lobes slightly yellow. Thoracic setae: 2 antepronotals; 1–3 minute proepisternals; 5–7 katatergitals; other setae as described for limbipennis species-group (diagnosed above). Legs shining yellow with mid and hind coxae, hind tibia and all tarsi slightly darker. Femora/tibiae setae slightly stronger: mid tibia ( Fig. 2 ) with 1 anterodorsal, 1 posterodorsal near middle, 2–3 ventral along distal half; hind femur ( Fig. 3 ) with 1 anteroventral at distal third; hind tibia ( Fig. 3 ) with 3–4 slender dorsal setae. Hind tarsomere 1 with one longer dorsal seta. Fore tarsus ( Fig. 1 ) unicolorous with tarsomere 1, swollen dorsally. Wing ( Fig. 4 ) entirely hyaline with inconspicuous pterostigma. Cell dm truncate. Veins M1, M2 and A1 evanescent. Halter white. Abdomen shining black, more gray pruinose on terminalia. Sternites 1–2 slightly yellow. Tergite 8 ( Fig. 5 ) with distal sinus. Epandrium ( Fig. 6 ) with anterodorsal and posterodorsal lobes of same height with shallow sinus. Anterior cercus very large with internal sinus; posterior cercus somewhat short; median lobe membranous with long setae. Hypandrium ( Fig. 7 ) with setae medially and apex somewhat simple. Ejaculatory apodeme with short dorsal lamella.

Female. Body length not measured; wing length 2.4 mm. Frons and face as in male. Fore tarsomere 1 not swollen. Hind femur without anteroventral setae. Hind tibia with 3 dorsal setae. Tergite 8 ( Figs. 8, 9 ) with distinct distal sulcus. Sternite 8 ( Figs. 8, 10 ) highly modified, with distinct sulcus ventrally and laterally. Genital fork ( Fig. 11 ) small with apex short U–shaped. Genital chamber membranous.

Geographical distribution. Brazil (Distrito Federal).

Type Material. HOLOTYPE ɗ: “ BRASIL, DF [Distrito Federal], Brasília, Res[erva] Biol[ógica] [do] IBGE, Brejoi (sic, = Brejo) Taquara [15 ° 57'21.93''S – 47 ° 53'18.32''W], iv.1981, B.F.S. Dias et al. Cols.” // “ Macrostomus inflatus Holótipo ɗ” ( INPA). PARATYPES. Same data as holotype, v.1981 (1Ψ, INPA); 18–25.iii.1982 (1ɗ, INPA, body entirely in microvial with glycerin).

Holotype condition. Pinned (previously preserved in alcohol), in good condition.

Etymology. From Latin inflatus = swollen, in reference to the swollen shape of the male fore first tarsomere.

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.