Nanna katmaiensis Malloch 1920

Nanna katmaiensis (Malloch, 1920)

Figs 117–122.

katmaiensis Malloch, 1920: 284 (Amaurosoma). Type-locality: “Katmai, Alaska” (USA).

variofemoratum Hendel, 1930: 10 [as var. of kamtschatkense]. Type-locality: “Klutchi” (Russia, Kamchatka Kray).

Remarks. The species was recorded by us from the Far East (Ozerov & Krivosheina, 2014b: 214). During the present study the determination of material was checked and it was discovered that 2 specimens only from Magadan Oblast (♀ from Ust'-Omchug and ♀ from Sokol env.) belong to this species. The rest of specimens proved to be Nanna tibiella (Zetterstedt, 1838).

Material examined. Chukotka: bank of Anadyr River (64.72N 175.21E), 25.VI.–19.VII.2014, А. Barkalov (1 ♂, ZMUM); Egvekinot (66.3224N 179.12W), 26.VII.1963, Gorodkov (5 ♂♂, 9 ♀♀, ZISP); Tyumen' Oblast: Neroyka (ca. 64.57N 59.67E), 450 m, 24–27.VI.1990, Malozemov (2 ♂♂, ZISP); river mouth of Arkayakha, 85 km NSW of Antipayut (ca. 69.4401N 74.8555E), 31.VII.1977, Gorodkov (1 ♂, ZISP).

Diagnostic description. Body-length 4.0–6.0 mm. Head. Frons from completely yellow to black, only lower quarter always yellow. 3 orbital setae present. Antenna black. Postpedicel with acutely angled upper apical corner, approximately 2–2.5 times as long as wide, in male slightly wider than in female. Thorax black, extensively grey dusted. Proepisternum with hairs in central part. Katepisternum with 3 strong setae, usually black in both sexes. Legs. All coxae blackish; femora blackish in central part and yellow basally and apically; tibiae yellow, sometimes hind tibia darkened on apical half; tarsi slightly darkened. Fore femur with 8–12 anteroventral setae (Fig. 117). Hind tibia with apical posteroventral seta, which usually is shorter than anteroventral apical seta. Wing tinged with brownish. Abdomen black, greyish dusted. Male sternite 4 rectangular, approximately 1.5 times as long as wide (Fig. 121). Male sternite 5 with black lobes, as in Fig. 118. Epandrium, cerci and surstyli as in Figs 119, 120. Female sternite 8 as two small separate sclerites.

Distribution. Russia (Fig. 122): Chukotka, Kamchatka Kray, Magadan Oblast, Tyumen' Oblast.—North America.