| Summary: | Diamesa pseudoinsignipes Makarchenko et Hansen, sp. nov. http://zoobank.org/NomenclaturalActs/ 61A15C00-2445-42A5-AB9B-69AB0D5A809 (Figs. 1–5, 8) Diamesa insignipes Kieffer; Hansen & Cook 1976: 103; Makarchenko 1985: 83; Linevich & Makarchenko 1989: 29; Makarchenko 2006: 266; Ashe & O'Connor 2009 (partly), misidentification. Material examined. Holotype: adult male (slide number 326), U.S.A.: Wyoming, Teton County, Snake River at Highway 22 west of Jackson, 6.III.1965, leg. A. V. Nebeker. Paratypes: 2 adult males, the same data as holotype; 1 adult male, RUSSIA: Kamchatka Peninsula, Petropavlovsk-Kamchatskyi City, 31.V.1908, leg. A.N. Derzhavin; 12 adult males, RUSSIA: Baikal Lake basin, Slyudyanka River, 2.5 km from the shore of Baikal Lake, 1.V.1956, leg. A.A. Linevich. Derivatio nominis. The species name consists of two parts – pseudo and insignipes which indicates a close relationship of the new species with Diamesa insignipes Kieffer. Description Adult male (n = 6, except when otherwise stated). Total length 4.0– 5.7 mm. Wing length 3.4–4.1 mm. Total length/wing length 1.11–1.15. Coloration. Head, thorax and abdomen dark brown; legs brown to light brown; wings greyish. Head. Eyes hairy and not extended dorsomedially. Temporal setae including 4–7 preoculars, 12–16 verticals and 8– 16 postorbitals. Clypeus with 8–15 setae. Antenna with 13 flagellomeres and developed plume; pedicel with 1 or 2 setae; terminal flagellomere with 1 subapical setae 51–63 μm long; AR 1.12–1.26. Palpomere lengths (in μm) (n=2): 60; 128; 180; 128; 184. Palpomere 3 distally with sensilla capitata (diameter 20 μm). Palpomeres 1–5 length/head width 1.09. Thorax. Antepronotum with 9–14 lateral setae. Acrostichals absent, dorsocentrals 9–15 (uniserial), prealars 5–11, scutellars ca 30. Wing. Length 3.4–4.1 mm; width 0.8–1.0 mm (1.12–1.19 mm in Wyoming specimens). R and R 1 with 18–27 setae, R 4+5 with 9–14 setae. Costa extension 79–101 μm long. RM length/MCu length 2.5–3.0. Anal lobe developed, outline rounded. Squama with ...
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