Nanna brevifrons Zetterstedt 1838

Nanna brevifrons (Zetterstedt, 1838)

Figs 88–93.

brevifrons Zetterstedt, 1838: 729 (Cordylura). Type-locality: “Lapponia Umensi … Salice ad Lyksele (Lappon.—Dalekarlia)” (Sweden).

Remarks. Noted by Gorodkov (1970: 449; 1986: 18) for European part of Russia without indicating specific locality.

Material examined. Irkutsk Oblast: Bolshoy Lug (52.12N 104.1E), 21.VI.1971, V. Richter (1 ♂, ZISP); Komi: Ust-Tsilma (65.4407N 52.1534E) 16.VI.1908, Zhuravskiy (1 ♀, ZISP); Krasnoyarsk Kray: Turuchansk (65.7972N 87.9586E), 27.VI.1967, Gorodkov (1 ♂, ZISP); Moscow Oblast: Bol'shevo (55.9250N 37.8683E), 7.V.1930, N. Violovich (1 ♂, 1 ♀, ZMUM); Tyumen' oblast: (63.818N 59.562E), 1–4.VII.2010, K. Tomkovich (1 ♀, ZMUM).

Diagnostic description. Body-length about 5 mm. Head. Frons black in upper part and reddish-yellow in lower quarter. 2 or 3 orbital setae present. Antenna black. Postpedicel with acutely angled upper apical corner, approximately 2.5–3 times as long as wide, in male wider than in female. Thorax black, grey dusted. Postpronotal lobe in lower part, katepisternum in upper dorsal corner, anepisternum almost completely and anepimeron in anterior part shining; sometimes scutum with two shining spots before transverse suture. Proepisternum with hairs in central part. Katepisternum with 2 strong setae (black in female and pale in male), anterior katepisternal absent. Legs yellow, only mid and hind coxae, and tarsi darkened. Fore femur with one anteroventral seta (Fig. 88). Hind tibia without apical posteroventral seta. Wing tinged with brownish. Abdomen black, slightly greyish dusted. Male sternite 4 rectangular, approximately 1.5 times as long as wide (Fig. 92). Male sternite 5 with black lobes, as in Fig. 89. Epandrium, cerci and surstyli as in Figs 90, 91. Female sternite 8 as two small separate sclerites.

Distribution. Russia (Fig. 93): Irkutsk Oblast, Komi, Krasnoyarsk Kray, Moscow Oblast, Tyumen' Oblast.— Europe.