Odontomesa fulva (Kieffer) (Figs. 17–19) Prodiamesa fulva Kieffer, 1919: 132. Monodiamesa fulva (Kieffer) Kieffer, 1922: 287. Prodiamesa nigripalpes Goetghebuer, 1922: 52. Prodiamesa flabellata Kieffer in Zavrel 1926: 279; Tshernovskij 1949: 109. Cryptochironomus polysetica Botnariuc & Cure, 1956: 259. Orthocladiinae gen.? 1. dospactica Dimitrov, 1963: 13. Odontomesa fulva fulva Saether, 1986: 18. Odontomesa fulva nearctica Saether, 1986: 20. Odontomesa fulva (Kieffer), Pagast 1947: 503, 541, 587; Shilova 1966: 239; Pankratova 1970: 112; Makarchenko, 1985: 105, 2006: 279; Ashe & O’ Connor 2009: 326; Liu et al 2016: 136 Material examined. Russia: 2 adult males, 3 mature pupae (males), 2 larvae, Russian Far East, Sakhalin Island, Noglicki District, Askasai River, 18.VIII.2021, leg. T. Tiunova. Comments. This species is rare in the Russian Far East, and in our material there were only two adult males, on the basis of which we make a brief redescription. Description Adult male (n = 2). Total length 3.5–4.2 mm. Total length/wing length 1.32–1.58. Coloration. Brownish brown, wings grayish, legs grayish brown. Head. Eyes bare, with long parallel-sided dorsomedial extention. Temporal setae including 9–12 verticals and 6– 8 postorbitals. Clypeus with 15 setae. Antenna with 13 flagellomeres and developed plume; AR 1.3–1.4. Palpomeres lengths (in μm): 64; 80; 130; 147; 227; apex of third palpomere with strong, sclerotized tooth. Palpomeres 1–5 length/head width 0.90. Thorax. Antepronotum with 4 lateral setae. Acrostichals absent, dorsocentrals 16–18, prealars 3, scutellars 28. Wing. Length 2.7 mm, width 0.7 mm. R and R 1 with 22; R 4+5 with 2 setae in distal part. RM length/MCu length 2.0. Anal lobe developed. Squama with 32 setae in 1–2 rows.. Legs. BR 1-3 1.9–2.0, LR 1 0.85, LR 2 0.44, LR 3 0.53, BV 1 2.49, BV 2 3.11, BV 3 2.48, SV 1 2.14, SV 2 4.62, SV 3 3.5. Hind tibial comb with 13 setae. ta 4 on all legs is longer than ta 5. Hypopygium (Figs. 17–19). Tergite IX with 18–20 setae, 12–18 μm long and anal point in the form of small tubercle. Laterosternite IX with 6–8 setae, 48–64 μm long. Gonostylus 100–120 μm long, slightly curved and covered with short setae, with megaseta 12–16 μm long and 1–2 setae nearest, 15–16 μm long. Gonocoxite 290– 240 μm long; inferior volsella flat and lobe-like, 100–150 μm long 1.0–1.3 times as long as gonostylus (Fig. 17). Superior volsella as small projection, with 1 seta 16–20 μm long (Fig. 19). Median volsella as in Fig. 18, with 5–7 setae. HR 2.0–2.2. Pupa and larva are described in detail by Thienamann (1944), Pagast (1947), Shilova (1966) and Pankratova (1970). Distribution. Widespread Holarctic species. In the Russian Far East is known for certain only from Sakhalin Island and Kamchatka Peninsula.

Published as part of Makarchenko, Eugenyi A. & Semenchenko, Alexander A., 2023, Review of subfamily Prodiamesinae (Diptera: Chironomidae) from the Russian Far East and bordering territory, pp. 1-26 in Zootaxa 5323 (1) on pages 9-11, DOI: 10.11646/zootaxa.5323.1.1, http://zenodo.org/record/8203829