Tachydromia chelana Melander

• Main Authors: Shamshev, Igor V., Grootaert, Patrick
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2024
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Diptera; Hybotidae; Tachydromia; Tachydromia chelana; Canada; Indigirka; Inuvik; Khaya; Mackenzie River; Nizhneyansk; Northwest Territories; Sakha; Seta; Tuktoyaktuk; Uryung-Khaya; Mackenzie river; Nome; Tundra; Yakutia; Yakutia Republic; Alaska
• Online Access: https://doi.org/10.5281/zenodo.10561748; http://treatment.plazi.org/id/038D87E9D818FFF2D7A2FCCDFE1D6769

Tachydromia chelana Melander (Fig. 4) Tachydromia chelana Melander, 1928: 282. Type locality: USA, Stehekin, at head of Lake Chelan, Washington. Notes on type series. Melander (1928) described T . chelana from the female sex only (two specimens taken from “ Stehekin, at the head of Lake Chelan, Washington ”). We have not examined the type material of this species. Material examined. NORTH AMERICA. CANADA. Northwest Territories: Tuktoyaktuk, 15.vii.1971, W. R. M. Mason (1 ♂, CNC); Inuvik, 68°22´N 133°45´W, MT, shore of E Branch Mackenzie River, H. Goulet & C. Boudreault (1 ♂, 1 ♀, CNC); Inuvik, 68°22′N 133°45′W, 23 m, sweeping, meadow, 9.vii.2010, H. Goulet & C. Boudreault (1 ♀, CNC). USA. Alaska: Nome area, mi. 17 of Kougarok Road, 64°42′N 165°17′W, Malaise, 20–26.vi.2005, J. & A. Skevington (1 ♂, CNC). EURASIA. RUSSIA. Sakha (Yakutia) Republic: Ajakit, 30.vii.1875, Czekanowski (1 ♀, ZISP); Chokurdakh, swampy floodplain of river Indigirka, 7.viii.1972, Gorodkov (1 ♂, 4 ♀, ZISP); same locality, 20.viii.1971, Gorodkov (1 ♀, ZISP); Uryung-Khaya, 5.viii.1988, Gorodkov (1 ♀, ZISP); Nizhneyansk, shrub tundra, 31.vii.1974, Gorodkov (1 ♂, ZISP); river Koyverelan, 63°05′N 173°00′E, 200 m, 28.vii.1959, Gorodkov (1 ♂, ZISP). Diagnosis. The species is distinguished by the following combination of characters: palpus without black subapical seta; proepisternum mostly pruinose. Male: palpus narrowed towards apex, mostly pale yellow, narrowly brownish at apex; mid tibia with 2 closely set, long subapical setae posteriorly. Female: palpus uniformly pale yellow. Redescription. Male (described for first time, Fig. 4A). Length: body 2.1–2.4 mm, wing 2.3–2.5 mm. Head black. Occiput (including posterior portion of vertex) densely greyish pruinose, shiny only behind mouth-opening; 2 short, black vertical setae. Ocellar triangle shiny; ocellars slightly shorter and finer than verticals. Frons shiny, nearly parallel-sided, above antennae 2.0–2.5 times as broad as anterior ocellus. Antenna with scape and pedicel yellow, ...