Scathophaga dasythrix ( Becker, 1894 )

Ozerov, A. L. & Krivosheina, M. G., 2021, A review of the genus Scathophaga Meigen, 1803 (Diptera: Scathophagidae) of Russia, Russian Entomological Journal 30 (2), pp. 201-246 : 209-212

Scathophaga dasythrix ( Becker, 1894)

Figs 19, 58–60 .

dasythrix Becker, 1894: 173 ( Scatophaga ). Type-locality: Medny I., Commander Islands ( Russia).

REMARK. This species was recorded in Russia from Far East (including Chukotka, Kamchatka, and Kuril Islands) [ Becker, 1894: 173; Gorodkov, 1986: 30 (without specifying the place of collecting); Ozerov, Krivosheina, 2014: 217].

MATERIAL EXAMINED. Chukotka: Provideniya (64.427ºN 173.225ºW), 2.VIII.1963, Gorodkov (1 ♂, ZISP) ; Ureliki (64.400ºN 173.214ºW), 6.VIII.1963, Gorodkov (1 ♂, ZISP) ; Kamchatka Krai: Apuka (60.444ºN 169.601ºE), 10 and 31.VII., 2 and 4.VIII.1959, Gorodkov (4 ♂♂, 3 ♀♀, ZISP) ; Commander Isands , Bering I. (55.065ºN 166.225ºE), 5–7.VIII.1931, I. Iogansen (5 ♂♂, 6 ♀♀, ZISP) ; Commander Isands , Mednyy I. (54.709ºN 167.709ºE), 1.VII.1958, Violovich (1 ♀, ZISP) ; Commander Isands, Nikol’skoe env. (55.196ºN 165.998ºE), 4.IX.1959, Gorodkov (3 ♂♂, 1 ♀, ZISP) ; Commander Isands, Preobrazhenskoe (54.790ºN 167.578ºE), 1.VI.1910, 4 and 5.VII.1911, Suvorov (6 ♂♂, 10 ♀♀, ZISP) ; same place, 6 and 7.IX.1959, Gorodkov (3 ♂♂, 1 ♀, ZISP) ; Korf (60.376ºN 166.023ºE), 22. VI.1959, Gorodkov (1 ♀, ZISP) ; Utashud I. (51.507ºN 157.696ºE), 9.VII.1958, Violovich (1 ♂, ZISP) . See also Ozerov & Krivosheina [2014: 217] .

DESCRIPTION. Male. Female. Body-length 6.2– 9.8 mm. Male thorax, abdomen and legs covered with dense, furry, crinkly, blackish or yellowish hairs. Female has hairs shorter; abdomen covered with hairs on ventral surface only.

Head. Frontal vitta blackish, only anteriorly dark reddish, with delicate whitish reflection; fronto-orbital plate black, greyish dusted. Face, parafacial and gena reddish, with delicate whitish reflection. Postcranium black. 3 orbital and 6–7 frontal setae present. Antenna black. Postpedicel approximately 1.5 times as long as wide. Arista bare. Palpus yellow.

Thorax black, densely greyish dusted. Scutum with setae only slightly differentiated from the other long hairs on scutum. Anepimeron with several hairs. Scutellum black, greyish dusted, with 4–6 pairs of setae along margin.

Legs black, densely greyish dusted. Male legs covered with long hairs, well visible apical setae on mid and hind tibiae only. Female: all femora covered with hairs, but without conspicuous setae; fore tibia with rows of dorsal and posterodorsal setae; mid tibia with 2–3 posterodorsal, 2–3 anterodorsal, 1 ventral setae and a ring of apicals; hind tibia with rows of thin posterodorsal and anterodorsal setae and a comb of short stong apical setae on anterior surface.

Wing tinged with brownish; crossveins r-m and dm-cu not darkened.

Abdomen black, densely greyish dusted. Male sternite 4 approximately 2 times as long as wide ( Fig. 19), Male sternite 5, epandrium, cercal plate and surstyli as in Figs 58–60 .

DISTRIBUTION. Russia: Pacific coast of Bering Strait south to Olutorsky Bay, Commander Islands; north Kuril Islands. — North America.

Figures

Figs 52–60. Scathophaga cordylurina (Holmgren) (52–54), S. crinita (Coquillett) (55–57) and S. dasythrix (Becker) (58–60): 52, 55, 58 — male sternite 5; 53, 56, 59 — epandrium, cercal plate and surstyli, lateral view; 54, 57, 60 — same, dorsal view. Рис. 52–60. Scathophaga cordylurina (Holmgren) (52–54), S. crinita (Coquillett) (55–57) и S. dasythrix (Becker) (58–60): 52, 55, 58 — стернит 5 самца; 53, 56, 59 — Эпандрий, церки и сурстили, сбоку; 54, 57, 60 — то же, сверху.