(Figs 1–6)
Sympycnus changaicus Negrobov, 1973: 148.
Sympycnus convergens Negrobov, 1973: 149, syn. nov. Type locality: Mongolia: “Central aimak, Mungen Morjet”. Sympycnus urgaicus Negrobov, 1973: 152, syn. nov. Type locality: Russia: “Sajangebirge, Arschan”.
Type material examined. Sympycnus changaicus: HOLOTYPE ♂, labelled: Mongolia: “ Archangaj aimak, Gebirgspas Egijn davaa, etwa 3000 m, 27.VIII.1967, Zajzev ” / Sympycnus changaicus Negrobov (ZIN).
Sympycnus convergens: HOLOTYPE ♂, labelled: Mongolia: “ Central aimak, Mungen Morjet, 6–7.VII.1967, Zajzev ” / Sympycnus convergens Negrobov (ZIN).
Sympycnus urgaicus: HOLOTYPE ♂, labelled: Russia: “ Sajangebirge, Arschan, 2.VII.1965, Negrobov ” / Sympycnus urgaicus Negrobov (ZIN).
Other material examined. Mongolia. 1♂, Ubsunurskii Aimak, 5 km N Khyargasa, 10.VIII.1970, Zaitsev (ZIN); 1♂, Khankh vil., 21.VII.1983, I. Ovchinnikov (ZMMU); 2♂, Tsentralnyi Aimak, 20 km S Ulaanbaatar, 2.VII.1967, Zaitsev (ZIN); 1♂, Tsentralnyi Aimak, 125 km SW Ulaanbaatar, 30–31.VII.1969 (Kerzhner); 2♂, Gobi-Altaiskii Aimak, 20 km SW Bugata, 20.VII.1970, Narchuk (ZIN); 1♂, Urga [= Ulaanbaatar] env., 1–2.VII.1905, Kozlov (ZIN). Russia. 1♂, [Transbaikalia,] Chita, 24.VI.1921, Sazhin (ZIN); 8♂, Transbaikalia, Turgu, 30.VI.1999, Makerov (ZIN); 4♂, Yakutia, Batagai, swampy lake bank, 9.VIII.1972, Gorodkov (ZIN); 1♂, Yakutia, Verkhoyansk, bog, 25.VII.1974, Gorodkov (ZIN); 1♂, 1♀ (in copula), 1♂, Yakutsk, 18.VII.1969, Sychevskaya (ZIN); 1♂, [Buryatia,] Sudzhii,12 verst of Troitskosavsk [= Kyakhta], 13.VII.1912, Maskova (ZIN); 2♂, [Buryatia,] Khargun, 6 km E Kyren, Sayany, sedge bog, 700 m, 11.VII.1965, Gorodkov (ZIN); 2♂, Altai Republic, Kosh-Agach env., 50.01°N, 88.66°E, 1750 m, 2–4.VII.2016, N. Vikhrev (ZMMU).
Remarks. Our examination of additional material has revealed intra-specific variation in leg coloration, and mid tibia and hind tarsus (Fig. 3) setation in this species. A re-examination of macerated hypopygia of the holotypes of Sympycnus changaicus, S. convergens and S. urgaicus has revealed that the hypopygial appendages are identical in all the specimens studied (Figs 5–6). The fore tarsus illustrated in Negrobov (1973, fig. 32) is actually Rhaphium sp. rather than S. convergens, being erroneously included in the paper. We consider all three of these species to be synonyms.
Distribution. Palaearctic: Mongolia. New for Transbaikalia Region, Altai, Buryatia and Yakutia Republics of Russia.