| Summary: | The new species Rhipidia ( Rhipidia ) chukotica sp. n. (Diptera: Limoniidae) is described and illustrated based on the male and female imago from the north-west of Chukotka, Russian Far East. This new species is closest to the East Palaearctic Rhipidia ( Rhipidia ) reductispina Savchenko, 1983; both species have long male’s antennae with ten bipectinate flagellomeres. Rhipidia ( Rh. ) chukotica sp. n. differs from Rh. ( Rh. ) reductispina by the uniformly coloured dark brown or black-brown thorax with prescutum and thoracic pleuron without noticeable longitudinal stripes, as well as by the colouration of legs, the abdomen and the hypopygium. Besides, Rh. ( Rh. ) chukotica sp. n. differs from Rh. ( Rh. ) reductispina by the presence of long setae-like rostral spines on the rostral prolongation of the ventral gonostylus, and by the smaller size and usual pubescence of the inner lobe of the ventromesal protrusion of the gonocoxites. Diagnosis of Rh. ( Rh. ) chukotica sp. n. Dark brown, relatively large species. The male antenna long, almost reaching abdominal base when bending backwards, with ten bipectinate flagellomeres. Prescutum without conspicuous longitudinal stripes. Thoracic pleuron dark brown, without darker longitudinal stripes. Wings pale grayish, with numerous small pale brown spots, of which five larger spots along the anterior margin of wing brown; dark spot in the middle part of cell sc small, far from reaching vein M; vein Sc comparatively long, vein Sc1 ending beyond half of the Rs length. Gonocoxite with a comparatively large ventromesal lobe, which has small, usually pubescent additional lobe on the inner side at base. Posterior margin of tergite 9 gently emarginated. Rostral prolongation of ventral (inner) gonostylus relatively long, with tuft of 3–5 long rostral setae-like spines near apex. ZooBank Article LSID: urn:lsid:zoobank.org:pub:A5727997-58D2-4B82-A270-01EBF984F687
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