Lispe nasoni Stein, 1898

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 : 24

Lispe nasoni Stein, 1898

Syntypes. 2 males, 2 females. U.S.A.

Diagnosis. Length of body. 5.5–6.5 mm (male, female). Head. Male dichoptic, frons very broad, more than one-third of head-width. Frons brown. Fronto-orbital plate dark brown on upper half and silver pruinose on lower half. Face, parafacial and gena silver pruinose. Ocellar triangle brown, reaching lunule. Male fronto-orbital plate with few setulae. Antenna brown; pedicel yellow at tip. Arista brown; bare on apical third. Palpus brown, gradually enlarged to apex. Vibrissa strong. Thorax. Scutum brown, grey dusted with 5 faint brown vittae. Dorsocentrals 2+4, the 2 first postsutural very short. Lower katepisternal strong, forming an equilateral triangle with the other two setae. Haltere yellow. Calypters white. Legs. Coxae and femora brown grey dusted; tibiae yellow; tarsi brown. Fore tibia with 1 anterodorsal and 1 posterodorsal setae, both median. Mid femur with 2 posterior preapical setae. Mid tibia with 1 submedian anterodorsal seta; without anteroventral and posterodorsal. Hind tibia with 1 median anterodorsal, 1 submedian anteroventral; without posterodorsal; a series of short anterodorsal setae on basal half; 1 dorsal preapical long. Arolium and pulvillus not enlarged. Wing. Costal spine indistinct. Vein M straight. Abdomen. Sternite 1 setulose.

Remarks. The Nearctic species were revised by Snyder (1954), who also presented an identification key where this species can be identified. It belongs to the uliginosa -group of Lispe , with the characteristic median basal plate of sternite 5 (Hennig 1960, text-fig. 120). The male and female terminalia were illustrated by Snyder (1954, figs 6, 29, 37, 57, 70). It is also in the key to Nearctic species of the uliginosa -group by Vikhrev (2015), and more recently has been keyed, redescribed and illustrated by Fogaça and Carvalho (2018, figs 16a–f, syntype male and female habitus).