Macrostomus dolichopterus ( Bezzi, 1909 )

Rafael, José Albertino & Marques, Dayse Willkenia Almeida, 2019, Five new species of Macrostomus Wiedemann and a checklist of Empididae (s. str.) (Diptera) from Bolivia, Zootaxa 4567 (2), pp. 251-275 : 255-256

Macrostomus dolichopterus ( Bezzi, 1909)

( Figs 3 A–B)

Rhamphomyia dolichoptera Bezzi, 1909: 328 (syntypes ♂ ♀). Melander, 1928: 191; Collin, 1933: 211 (cit).

Macrostomus dolichopterus: Smith, 1961: 53 ; 1967: 30 (cat.); Rafael & Cumming, 2004: 446.

Diagnosis. Slender, shiny, with thorax mainly yellow, darker dorsally; wing elongate, darker on costal and distal margins, base very narrow, no anal lobe; abdomen shiny black (female); legs mainly yellow in male specimen, darker in female specimen; female with short dorsal pennate setae on hind tibia.

Redescription. Lectotype male. Abdomen and wings lost. Body length from original description: “ 3.75–4.5 mm; wing length 4.75–5.5 mm ”. Head narrowly dichoptic. Frons and face shiny black, slightly narrower than anterior ocellus width. One pair of proclinate ocellar setae. Inner vertical seta stouter than outer vertical seta, latter subequal in length to uniseriate postocular row of setae; only 1–2 pairs of dorsal occipital setae. Antenna dark brown to black with postpedicel setulose. Proboscis yellow, 1.5X longer than head height. Antenna dark brown to black with postpedicel short pubescent. Thorax mainly shiny yellow, with scutum, scutellum and mediotergite brown, with disc of scutum and scutellum slightly gray pruinose. Thoracic chaetotaxy: 3–4 antepronotals; 1 postpronotal stout, 1–2 weak; 4 dorsocentrals; 1 presutural supra-alar; 0 postsutural supra-alar; 1 postalar; 2 small proepisternals; 1 notopleural stout, 1–2 weak; 2 pairs of scutellars, inner pair stouter, slightly convergent; 3–4 laterotergitals. Legs shiny yellow with apex of fore and mid tibiae, apex of hind femur, entire hind tibia and all tarsi brown. Hind leg ( Fig. 3A ) with femur clavate. Legs longer setae: tibia with 4 longer dorsal setae, median weaker; tarsomere 1 with 3 submedian dorsal setae. Wings lost, described as “ alis elongatissimis basi cuneatis, hyalinis ad marginem anticum et apicem vitta fusca ornatis, cellula anali forma solita ” [wing very elongate, base very narrow, hyaline with costal and apical margins brownish, anal vein of normal shape]. Abdomen lost, described as “ Männliche Genitalien etwa wie bie macerrima ” [terminalia like in M. macerrima ].

Female (paralectotype). Body length 4.1 mm; wing length 5.2 mm. As in male, except frons slightly wider than anterior ocellus width; hind tibia lost, described as “ tibiis posticis retro breviter fusco pennatis ” [hind tibia with short dorsal pennate setae]. Wing ( Fig. 3B ) elongate, light brown infuscated in costal and distal margins; pterostigma rather inconspicuous; no anal lobe. Halter light brown. Abdomen shiny black with longer pale setae on posterior margin of tergites. Terminalia lost, described as “ lamelli apicalibus longissimis ” [terminalia very elongate].

Geographical records. Bolivia (La Paz).

Type material examined. LECTOTYPE ♂ (here designated): “ BOLIVIA [La Paz], Mapiri, San Carlos , 06.i. 1903, 800 m” (SMTD). PARALECTOTYPE: BOLIVIA, Sarampioni , 16.iii. 1903, 700 m (1 ♀, SMTD, postpedicel, all left legs and right hind leg lost; right wing mounted on microslide; abdomen damaged in microvial with glycerin) .

Lectotype condition. Wings and abdomen lost.

Remarks. Lectotype designated accordingly to fix and stabilize the current concept of the name.

Figures

FIGURE 3. Macrostomus dolichopterus (Bezzi, 1909). A. Hind left leg, lectotype ♂, anterior view; B. Wing, paralectotype ♀. Scale bars, figures A–B = 1 mm.