Thaumasiochaeta nigriceps ( 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 : 48

Thaumasiochaeta nigriceps ( Stein, 1911)

Figs 201–204

Paralectotypes. 1 male, 1 female. Lectotype in SMT, designated by Pont (2001: 478). Peru .

Diagnosis. Length of body. 4.0 mm (male), 4.5 mm (female). Head. Male frons about one-third of head-width. Frons, fronto-orbital plate, parafacial, face and gena strongly golden pruinose. Ocellar triangle reaching halfway to lunule. Ocellar setae very long. Antenna dark brown. Arista dark brown, bare. Palpus dark brown, long, enlarged and flat. Oral margin strongly projecting forwards. Thorax. Scutum dark brown. Dorsocentrals 2+3. Katepisternals 1:1. Haltere brown. Calypters white. Legs. Brown. Male fore tibia with 1 long ventral seta on apical third, its apex flat, triangular in shape. Mid tibia with 2 anterodorsal, 2 posterodorsal and 2 anteroventral setae, all on middle third. Hind femur bowed on basal third. Hind tibia with 2 anterodorsal, 2 posterodorsal and 2 anteroventral setae, all on middle third. Arolium and pulvillus short. Wing. Clear. Costal spines distinct. Abdomen. Brown, broadly grey pollinose.

Remarks. It can be recognized by the oral margin strongly projecting forwards; the wing unspotted; and the male fore tibia with 1 long ventral seta on apical third, its apex flat and triangular in shape. It was keyed by Couri (1999) and by Couri and Carvalho (2002). Morphological features and the male and female terminalia were illustrated by Couri (1999, figs 29–39).