Trichopalpus (Huckettia) nearcticus ( Vockeroth, 1995 )

Ozerov, A. L., 2019, A review of the genus Trichopalpus Rondani, 1856 (Diptera: Scathophagidae) of Russia, Russian Entomological Journal 28 (4), pp. 470-484 : 475-478

Trichopalpus (Huckettia) nearcticus ( Vockeroth, 1995)

Figs 9, 15, 21, 27.

nearctica Vockeroth, 1987: 1095 . ( Huckettia ). Nomen nudum.

nearctica Vockeroth, 1995: 733 ( Huckettia ). Type-locality: Beaverhill Lake (66°44’N, 104°20’W) ( Canada).

Recorded in Russia from Siberia (Yakutia) [ Engelmark, 1999] and Russian Far East (Chukotka) [ Ozerov, Krivosheina, 2014].

ADDITIONAL MATERIAL. Canada: Beaverhill L., N.W.T. 62°44’N. 104°20’W. 29.VI .1966 , G.E. Shewell (1 ♂, 1 ♀, ZMUM); Nr. Beechey L., N.W.T. 65°14’N. 106°50’W. 18.VII.1966, G.E. Shewell (1 ♀, ZMUM); Salmita Mines , 64°05’N. 111°15’W. N.W. T ., 19.VII.1953, J.G. Chillcott (1 ♂, ZMUM); Spence Bay N.W. T ., 11.VII.1951, J.G. Chillcott (1 ♂, ZMUM); Clyde , GaffinIs., N.W. T ., 24.VII.1958, G.E. Shewell (1 ♂, ZMUM) .

DESCRIPTION. Male, female. Medium-sized flies (3.2–5.1 mm long).

Head. Frontal vitta blackish in upper part and reddish yellow in lower half, third or only quarter; matt. Fronto-orbital plate black, greyish dusted. Face, parafacial and gena reddish yellow. Postgena black, greyish dusted. Postcranium black, greyish dusted, covered with

13 15

17 18

Figs 13–18. Male sternite 5 of Trichopalpus spp. : 13 — T. fraternus (Meigen) ; 14 — T. lacteipennis (Ringdahl) ; 15 — T. nearcticus (Vockeroth) ; 16 — T. nigribasis (Curran) ; 17 — T. obscurellus (Zetterstedt) ; 18 — T. punctipes (Meigen) .

Рис 13–18. Стернит 5 самца видов Trichopalpus : 13 — T. fraternus (Meigen) ; 14 — T. lacteipennis (Ringdahl) ; 15 — T. nearcticus (Vockeroth) ; 16 — T. nigribasis (Curran) ; 17 — T. obscurellus (Zetterstedt) ; 18 — T. punctipes (Meigen) .

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, including short erect seta on anterior margin of scutum (only prescutellar seta strong), intra-alars 1+2 (usually very 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 black). Fore femur with a row of posterodorsal setae. Male fore tibia curved, with 1 strong posterior seta, with 1 preapical dorsal and 1 apical posterior setae. Female fore tibia more or less direct, with 1 posterior, 0–1 anterodorsal, 1 preapical dorsal and 1 apical posterior setae. Mid femur with a row of anterior setae (unclear in male), 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. 9). Male sternite 5 with broad triangular lobes (Fig. 15). Epandrium and surstyli as in Figs 21 , 27 .

DISTRIBUTION. Russia: Yakutia [ Engelmark, 1999] and Chukotka [ Ozerov, Krivosheina, 2014]. — North America.

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).