Scathophaga intermedia ( Walker, 1849 )

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 : 223

Scathophaga intermedia ( Walker, 1849)

Figs 26, 79–81.

intermedia Walker, 1849: 980 ( Scatophaga ). Type-locality: “ Nova Scotia ” ( Canada).

hadleyi Ozerov, 2013: 88 ( Scathophaga ). Type-locality: Tserkovnaya Bay (43.75ºN 146.70ºE), Shikotan I. ( Russia).

REMARK. The species was registered for Russia from the Far East by Gorodkov [1986: 31, on “sea coast”, but without specifying the place of collecting] and by Ozerov & Krivosheina [2014: 217].

MATERIAL EXAMINED. Kamchatka Krai: Apuka env. (60.443ºN 169.602ºE), 19.VIII.1959, Gorodkov (3 ♀♀, ZISP) ; Commander Islands , Mednyy I. (ca 54.790ºN 167.578ºE), 29.VII., VII.–VIII.1932, I. Barabash (2 ♂♂, 1 ♀, ZISP) ; Commander Islands, Nikol’skoe (55.196ºN 165.998ºE), 9.IX.1959, Gorodkov (6 ♂♂, 5 ♀♀, ZISP) ; Commander Islands, Preobrazhenskoe (54.790ºN 167.578ºE), 5.IX.1959, Gorodkov (21 ♂♂, 28 ♀♀, ZISP) ; Nizhne–Kamchat. [sky ostrog] (56.247ºN 162.017ºE), 15.VIII.1909, P. Shmidt (1 ♀, ZISP) ; Ust’-Kamchatsk (56.229ºN 162.469ºE), 10.VIII.1930, E. Gur’yanova (1 ♂, ZISP) ; Khabarovsk Krai: Bulgino env. (59.371ºN 143.147ºE), 29.VIII.1987, Gorodkov (1 ♂, ZISP) ; Imperatorskaya Gavan’ [= Sovetskaya Gavan’] (48.957ºN 140.281ºE), IX.1908, V. Artem’ev (8 ♂♂, 2 ♀♀, ZISP) ; Cape Pronge (52.853ºN 141.225ºE), 10– 11.IX.1911, Derbek (7 ♂♂, 6 ♀♀, ZISP) ; Magadan Oblast: Evensk (61.916ºN 159.234ºE), 8.IX.1987, Gorodkov (10 ♂♂, 3 ♀♀, ZISP) ; Koni peninsula, cordon “Mys Plosky” (59.15ºN 151.63ºE), 2–8.VII.2017, Sorokina (4 ♂♂, 1 ♀, ZISP) ; Koni peninsula, Cape Plosky (59.161ºN 151.643ºE), 16.VII. and 10.IX.2015, 21.VIII.2017, N. Tridrikh (35 ♂♂, 12 ♀♀, ZMUM) ; Sakhalin Oblast: Iturup I., Rybaki (45.209ºN 147.851ºE), 23. VI.1968, V. Richter (1 ♂, 1 ♀, ZISP) ; Kunashir I., Dubovoe (43.766ºN 145.499ºE), 10.VI.1973, 20.VII.1973, Kerzhner (2 ♀♀, ZISP) ; Kunashir I., Golovnino (43.737ºN 145.517ºE), 27.IX.1968, Gorodkov (1 ♀, ZISP) ; Paramushir I., Severo-Kuril’sk (50.679ºN 156.132ºE), 7–12.IX.1968, Gorodkov (28 ♂♂, 22 ♀♀, ZISP) ; same place, 18.VIII.1978, A. Zinov’ev (28 ♂♂, 22 ♀♀, ZISP) ; Sakhalin I., Rakuma [now =Antonovo] (47.166ºN 142.083ºE), 17.IX.1946, Strelkov (3 ♂♂, 8 ♀♀, ZISP) ; Shikotan I., Malokuril’sk (43.869ºN 146.829ºE), 21.IX.1968, Gorodkov (2 ♀♀, ZISP) ; Shikotan I., Tserkovnaya Bay (43.75ºN 146.70ºE), 16.VIII.1973, Kerzhner (1 ♀, ZISP) ; same place, 25–30.IX.2012, Yu. Sundukov (2 ♀♀, ZMUM) ; Yankicha I. (47.517ºN 152.811ºE), 16.VII.1958, Violovich (2 ♀♀, ZISP) ; Zelenyy I. (43.51ºN 146.137ºE), 2.VIII.1955, Violovich (8 ♂♂, 20 ♀♀, ZISP) . See also Ozerov & Krivosheina [2014: 217, including S. hadleyi ] .

DESCRIPTION. Male. Female. Body-length 5.8– 9.8 mm.

Thorax, abdomen and legs of most males, especially large exemplares, covered with dense, long, blackish hairs. Females have hairs less dense and shorter.

Head. Frontal vitta reddish-yellow, with delicate whitish reflection; fronto-orbital plate black, greyish dusted. Face, parafacial and gena yellow, with whitish or golden reflection. Postcranium black. 3 orbital and 4–5 frontal setae present. Scapus and pedicel reddish-yellow or brownish. Postpedicel black, approximately 2 times as long as wide. Arista nearly bare, longest hairs not exceeding greatest diameter of arista. Palpus yellow.

Thorax black, densely greyish dusted, with dark stripes and fuzzy spots on scutum and scutellum. Acrostichals in two rows, prescutellar pair stronger than the other acrostichals, dorsocentrals 4+4, intra-alars 1+2, supra-alars 1+2, postpronotals 2. Anepimeron covered with hairs. Scutellum black, greyish dusted, with a pair of strong basal scutellar and a pair of strong apical scutellar setae, also with a pair of discal setulae.

Legs densely greyish dusted. All coxae black; all femora from black to yellow, as a rule fore femur always blackish; all tibiae and tarsi yellow. Male legs covered with long hairs, clearly visible setae on mid and hind tibiae only. Female fore femur also without conspicuous setae. Fore tibia with 2–3 anterodorsal, 2 posterodorsal, 1 posterior, 1 preapical dorsal, and 1 posterior apical setae. Mid femur with a row of anterodorsal setae, also with 1 preapical posterior and 1 preapical posterodorsal setae. Mid tibia with 3 posterodorsal, 2 anterodorsal, 1 ventral, 1 posterior setae and a ring of apicals. Hind femur with a row of anterodorsal setae. Hind tibia with 4–5 anterodorsal, 4–5 posterodorsal, 1 preapical dorsal, 1 preapical anterodorsal, 1 apical anterior, 1 apical anteroventral, and 1 apical ventral setae.

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

Abdomen black, densely greyish dusted, covered with dense hairs in male; in female tergites with black marginal setulae. Male sternite 4 about twice as long as wide ( Fig. 26); sternite 5 with filiform lateral lobes and a pair of median processes (Fig. 79). Epandrium, cercal plate and surstyli as in Figs 80, 81.

DISTRIBUTION. Russia: Pacific coast. — North America.