Trichopalpus (Huckettia) lacteipennis ( Ringdahl, 1920 ) Ozerov, 2019

Ozerov, A. L., 2019, A review of the genus Trichopalpus Rondani, 1856 (Diptera: Scathophagidae) of Russia, Russian Entomological Journal 28 (4), pp. 470-484 : 475

Trichopalpus (Huckettia) lacteipennis ( Ringdahl, 1920) , comb.n.

Figs 8, 14, 20, 26.

lacteipennis Ringdahl, 1920: 38 ( Microprosopa ). Type-locality: “in Lappland auf dem Gebirge Tjuonjatjakko ca 1000 Meter...”

Noted by Gorodkov [1970] for European part of Russia from Kola Peninsula.

MATERIAL. Arkhangelsk Oblast: the lower reaches of the Pechora River (68.3348°N 53.3046°E), 11.VII.2008, A.L. Ozerov (2 ♂♂, ZMUM). Krasnoyarsk Krai: Ust’-Tareya (73.2527°N 90.5962°E), 24.VII.1967, Gorodkov (2 ♂♂, ZMUM, ZISP) .

ADDITIONAL MATERIAL. Sweden: TLpm: Abisko, Birch Forest 1 km NW of NatVetStn, 24. VI .1997 A.C. Pont (1 ♂, ZMUM) .

DESCRIPTION. Male. Medium-sized flies (3.0– 4.1 mm long).

Head. Frontal vitta blackish in upper part and yellow in lower half, third or quarter only; matt. Fronto-orbital plate black, greyish dusted. Face, parafacial and gena yellow. Postgena black, greyish dusted. Postcranium black, greyish dusted, covered with black setae in upper third and pale hairs in lower part. 3 orbitals, 2–3 frontals, 1 ocellar, 1 postocellar (short), 1 inner vertical, 1 outer vertical; 2 pairs of vibrissae present. Antenna black, only postpedicel usually yellow inside basally. Postpedicel with more or less rounded upper apical corner, 1.5–2.0 times as long as wide. Arista black, basally thickened, bare. Clypeus and proboscis black. Palpus yellow.

Thorax black, greyish dusted, but katepisternum and meron each with shining spot. Acrostical hairs in two rows, dorsocentrals (3–4)+(3–4), including short erect seta on anterior margin of scutum, intra-alars 1+2 (usually small), supra-alars 1+2, postpronotals 2, notopleurals 2, postalars 2. Proepisternum covered with hairs anteriorly, with 1–2 setae near lower margin. Proepimeron with one seta. Anepisternum covered with hairs in posterior half, with 3–4 setae along posterior margin. Katepisternum covered with hairs in posterior half, with 1 strong seta in upper posterior corner. Anepimeron bare. Scutellum black, greyish dusted, with a pair of basal scutellar and a pair of apical scutellar setae.

Legs black in ground color, greyish dusted; tibiae from black to yellowish (usually brownish). Fore femur with a row of posterodorsal setae. Fore tibia curved, with 1 preapical dorsal and 1 apical posterior setae. Mid femur with a row of anterior setae, with 1 preapical posterior and 1 preapical posterodorsal setae. Mid tibia with 1 anterodorsal, 1 posterodorsal and a ring of apical setae. Hind femur with a row of anterodorsal setae and several anteroventral setae in apical half. Hind tibia with 2 anterodorsal, 2 posterodorsal, 1 preapical dorsal, 1 apical/preapical anterodorsal and 1 apical anteroventral setae.

Wing tinged with brownish; veins brown. R 1 bare dorsally. Crossvein r–m darkened. Calypters, margins of calypters, and halteres yellowish or brownish.

Abdomen black, greyish dusted dorsally, shining laterally. Male sternite 4 rectangular, about 0.3 times as long as wide (Fig. 8). Male sternite 5 with broad triangular lobes (Fig. 14). Epandrium and surstyli as in Figs 20 , 26 .

NOTE. The species was described in the genus Microprosopa Becker, 1894 and to date has been in this genus [ Nelson, Greve, 2002; Šifner, 2008; Kahanpää, Haarto, 2014]. T. lacteipennis is very similar to T. nearcticus both externally (see below) and in structure of male sternites 4 and 5 (compare Figs 8, 9, 14, 15) and male surstyli (compare Figs 26, 27 ). Other differences are given in the key (see below).

DISTRIBUTION. Russia: Arkhangelsk Oblast, Krasnoyarsk Krai. — Europe (Scandinavia) .

Figures

Figs 19–24. Epandrium, cerci and surstyli, lateral view of Trichopalpus spp.: 19 — T. fraternus (Meigen); 20 — T. lacteipennis (Ringdahl); 21 — T. nearcticus (Vockeroth); 22 — T. nigribasis (Curran); 23 — T. obscurellus (Zetterstedt); 24 — T. punctipes (Meigen). Рис. 19–24. Эпандрий, церки и сурстили, вид сбоку видов Trichopalpus: 19 — T. fraternus (Meigen); 20 — T. lacteipennis (Ringdahl); 21 — T. nearcticus (Vockeroth); 22 — T. nigribasis (Curran); 23 — T. obscurellus (Zetterstedt); 24 — T. punctipes (Meigen).

Figs 25–28. Epandrium, cerci and surstyli, dorsal view of Trichopalpus spp.: 25 — T. fraternus (Meigen); 26 — T. lacteipennis (Ringdahl); 27 — T. nearcticus (Vockeroth); 28 — T. nigribasis (Curran). Рис. 25–28. Эпандрий, церки и сурстили, сверху видов Trichopalpus: 25 — T. fraternus (Meigen); 26 — T. lacteipennis (Ringdahl); 27 — T. nearcticus (Vockeroth); 28 — T. nigribasis (Curran).