Syllimnophora aliena ( Stein, 1911 )

Couri, Márcia & Pont, Adrian, 2020, Type specimens of Limnophorini (Diptera: Muscidae) deposited in the Museum für Naturkunde, Humboldt-Universität zu Berlin (Berlin, Germany), Zoologia (e 46879) 37, pp. 1-57 : 43

Syllimnophora aliena ( Stein, 1911)

Figs 161–164

Paralectotypes. 6 males, 4 females. Lectotype in SMT, designated by Pont (2001: 462). Bolivia, Peru, Chile .

Diagnosis. Length of body. 5.0– 5.3 mm (male), 5.2–5.5 mm (female). Head.Male about one-fourth of head-width. Frons brown, silver-golden pruinose. Fronto-orbital plate, parafacial and gena brown; gena with a little grey dust below. Ocellar triangle silver pollinose on upper half and golden pollinose on lower half; long, almost reaching lunule. Ocellar setae long and with many additional setulae. Antenna dark brown. Arista dark brown, bare. Palpus dark brown. Oral margin projecting forwards and with many black setae besides the vibrissa. Thorax. Scutum dark brown, silver pruinose along the dorsocentral rows of setae when viewed from behind. Postpronotum and notopleuron silver pruinose. Dorsocentrals 2+3. Haltere brown. Calypters white. Legs. Brown. Fore tibia without a posterior seta. Mid tibia with 2 posterior setae. Hind femur with an anteroventral row of setae on apical half. Hind tibia with 3 anterodorsal setae on middle third; 1 submedian anteroventral; without posterodorsal. Arolium and pulvillus not enlarged. Wing. Costal spine indistinct. M slightly curved forwards close to apex. Abdomen. Dark brown, with a median silver pruinose vitta on tergites 1+2–4 and lateral spots on all tergites, silver and golden pruinose. Sternite 5 golden pruinose.

Remarks. The species can be recognized by the slightly narrower male frons which is silver-golden pruinose; the brown haltere; the golden pruinose spots on abdomen; and the golden pruinose sternite 5. It can be identified with the keys by Stein (1911, as Limnophora aliena ) and by Malloch (1934, as Syllimnophora aliena ).