Macrostomus limbipennis (Bezzi)

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 : 48-50

Macrostomus limbipennis (Bezzi)

( Figs. 12–25 )

Rhamphomyia limbipennis Bezzi, 1909: 329 .

Rhamphomyia (Lundstromiella) limbipennis ; Melander, 1928: 183.

Macrostomus limbipennis ; Collin, 1933: 210; Smith, 1961: 54; 1967:30 (catalogue); Rafael & Cumming, 2004: 446 (citation); Yang et al., 2007: 145 (catalogue).

Diagnosis. Postgenal and antepronotal setae as strong as dorsal thoracic setae. Tergite 8 fused with sternite 8, humped with microspinulose lateral expansion. Hypandrium somewhat narrow at apex, subequal in diameter along its length.

Re-description. Lectotype male, designated below. Head and thorax redescription, except legs, based on Peruvian Amazonian conspecific specimens with the examined lectotype. Body length 3.8 mm; wing length 3.8 mm. Male frons shining black, as large as anterior ocellus width. Face less shining black, as wide as frons, slightly gray pruinose at apex. Ocellar tubercle slightly protuberant with 2 pairs of ocellar setae, posterior pair minute. Postcranium black, gray pruinose with slender setae, except for 3 postgenal setae as strong as dorsal thoracic setae. Antenna velvety black with pedicel yellowish. Flagellum with three flagellomeres. Proboscis yellow, brown at base. Palpus brown with 2 longer ventral and 1 longer distal setae. Thorax shining black, gray pruinose, with prosternum yellow, propleura, postpronotal and postalar lobes partially yellow. Thoracic setae: 3–4 antepronotals as strong as adjacent thoracic setae; 2–3 proepisternals with one stronger; 8–10 katatergitals with anterior row longer; other setae as described for limbipennis species-group (diagnosed above). Legs shining predominantly yellow with distal half of hind femur, distal fourth of fore tibia, distal three-fourths of mid tibia, entire hind tibia black; all tarsi black with fore tarsomeres 1–4 white distally and tarsomere 2 white banded medially. Femora/tibiae setae slightly stronger: fore tibia ( Fig. 12 ) with 2 anterodorsals along basal third, 2 posterior setae with one near middle and one along distal third (sometimes some setae absent); mid femur ( Fig. 13 ) with 1 stronger anterior near apex; mid tibia with 2 anterodorsals, 2 posterior along basal half, 1 anteroventral at middle of distal half, 1 posteroventral seta near middle; hind femur ( Fig. 14 ) with 2 anterior setae with one at basal fifth and one at distal fifth, 2 anteroventral along median third with distal strongest; hind tibia with 5–6 slender dorsal setae. Hind tarsomere 1 with one longer dorsal seta and short spine-like setae ventrally. Wing ( Figs. 15, 16 ) brown infuscated along costal and distal margin. Cell dm somewhat acute. Veins M1, M2 and A1 distinct. Halter yellowish with knob whitish. Abdomen and terminalia redescription based on lectotype. Abdomen shining black with gray pruinescence on terminalia. Tergite 8 fused with sternite 8 ( Fig. 18 ), humped with microspinulose lateral expansion ( Figs. 17, 18 ). Epandrium ( Fig. 18 ) with anterodorsal and posterodorsal lobes of same height. Anterior cercus somewhat small, narrower ventrally; posterior cercus widened distally; median lobe membranous with long setae. Internal arm of bacilliform sclerite very developed with strong setae distally. Hypandrium ( Fig. 19 ) with setae placed medially, distal pair longer; apex somewhat narrow, subequal in diameter along its length; subapically with paired membranous expansion, anterior distal margin more sclerotized and projected over apex. Ejaculatory apodeme with short dorsal lamella.

Female. Frons and face wider than anterior ocellus width and wider than in male. Cell r1 entirely brown infuscated ( Fig. 20 ). Fore tarsi unicolorous. Tergite 8 ( Figs. 21, 22 ) widened laterally, with distinct sulcus distally. Sternite 8 ( Figs. 22, 23 ) divided. Genital fork small with apex slightly wider ( Fig. 24 ). Genital chamber highly sclerotized ( Figs. 22, 24 ). Spermathecal duct elongated, widened medially and with spherical spotted receptacle distally ( Fig. 25 ).

Geographical distribution. Peru, Bolivia, Ecuador, Brazil (Amazonas, Acre).

Type Material. LECTOTYPE ɗ, here designated: “ PERU [Pasco], Pichis, Puerto Bermudez, 10.xii.1903, [300m.]” ( SMTD). PARALECTOTYPES: same data as lectotype (1Ψ, SMTD, poor condition); 08.xii.1903 (1 specimen SMTD, in poor condition); 11.xii.1903 (1 specimen SMTD, in poor condition).

Additional material. PERU, Cuzco, Quincemil, 13–31.viii.1962, L. Pena, 780 m (30ɗ, 11Ψ, CNC; 5ɗ, 1Ψ, INPA); Quincemil, 27–31.viii. 1962, 740 m (5ɗ, CNC); Quincemil, viii.1962 (5ɗ, CNC); Quincemil, 10–20.ix. 1962, 400 m (1ɗ, 2Ψ, CNC); Quincemil, 15–30.x. 1962, 700 m (14ɗ, 5Ψ, CNC); Quincemil, 01–15.xi. 1962, 700 m (41ɗ, 23Ψ, CNC; 7ɗ, 7Ψ, INPA); Huanuco, Tingo Maria, 14.x.1940, 2200 ft, J.C. Pallister coll., Donor Frank Johnson (1Ψ, AMNH); Tingo Maria, Monson Valley, 21.x.1954, E.I. Schlinger & E.S. Ross, Collection CAS, San Francisco (1ɗ, CAS); Yurao, 67 mi. E. of Tingo Maria, 16.xi.1954 (1 specimen CAS, without abdomen); ECUADOR, Loja, W. Zamora, 1200 m, xi.1970, L.E. Pena (2ɗ, MZSP). BRAZIL, Amazonas, Juruá, Minervazinho, 13–21.i.1996, P. Bührnheim & N.O. Aguiar, Malaise (1Ψ, INPA); Acre, Cruzeiro do Sul, Rio Moa, 0 7 ° 37'02''S – 72 ° 46'15''W, 19–28.xi.1996, J.A. Rafael, J. Vidal & R.L. Menezes, varredura, mata (1ɗ, INPA).

Lectotype condition. Left flagellum lost; right wing mounted on microslide and abdomen in microvial with glycerin.

Variation. One specimen from Brazil (Acre, Cruzeiro do Sul) with legs predominantly black.

Figures

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 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.