taxonID	type	description	language	source
1C1D7E5EFFF1FFDE7EB6FA9DFE251575.taxon	materials_examined	Type species: Aproceros umbricola Malaise, 1931, by original designation.	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFF1FFDE7EB6FA9DFE251575.taxon	distribution	DISTRIBUTION. East Palaearctic and Oriental regions; introduced to the West Palaearctic (Blank et al., 2014) and Nearctic (Martel et al., 2021).	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFF1FFDE7EB6FA9DFE251575.taxon	biology_ecology	HOST PLANT. Ulmaceae: Ulmus glabra, U. laevis, U. minor, U. davidiana, U. pumila, U. japonica etc.	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFEFFD17FA1FEA0FCF3150C.taxon	materials_examined	MATERIAL MISIDENTIFIED EXAMINED. Russia: Primorskiy Terr.: vicinity of Spassk [- Dal’niy], 29. VI. 1961 (S 000), A. Zhelochovtsev leg., 1 ♀ (ZMMU); Sikhote-Alin, Syahobe [Serebryanka] River basin, 24. VII. 1936, K. Grunin leg., 1 ♀ (ZMMU) (A. N. Zhelochovtsev determination).	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFEFFD17FA1FEA0FCF3150C.taxon	description	REDESCRIPTION. Female (after Togashi, 1962, only for principal characters). Body length 6.5 mm. Body black, shining; mouthparts yellowish; mandibles at apex red-brown; pronotum and most of mesothorax except posterior margin of scutellum pale brown; basal half of abdomen yellow-brown. Antennae brownish-black. Legs pale orange, fore and middle coxae and apices of hind tarsi darkened. Wings uniformly infuscated, forewings slightly stronger at base, veins and pterostigma dark brown. Head and thorax covered with greyish-white pubescence. Head from above transverse, strongly narrowed behind eyes; POL: OOL: OCL = 2: 3: 1. Supraclypeal area slightly convex, with a sharp median carina; anterior tentorial pit deep, connected with antennal foveae; median fovea punctiform, deep; malar space broad, about twice as long as antennal scape; anterior margin of clypeus nearly truncate. Antennae nearly as long as costa of fore wing. Median lobe of mesonotum (prescutum) with distinct median fold. Male. Unknown.	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFEFFD17FA1FEA0FCF3150C.taxon	distribution	DISTRIBUTION. Japan (Honshu). Record from Russia is misidefinition (see below for more details).	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFEFFD17FA1FEA0FCF3150C.taxon	discussion	REMARKS. All the specimens we studied, identified earlier by Zhelochovtsev as A. hakusanus, should be considered light-coloured forms (Form B) of the summer generation of A. leucopoda, which is confirmed by molecular data. As result, I exclude A. hakusanus from the list of sawflies of Russia. The type material of A. hakusanus was kept in Togashi's personal collection (Togashi, 1962), and after his death, the place of storage of the types is unknown and their re-study is now impossible. Perhaps the real range of this species (if it is valid taxon) is limited only to Japan, as the species is not recorded elsewhere outside the country. It is very possible that this taxon may be only a light-coloured form of one of the Japanese species. In favour of this is the light colouration of the body and the strongly constricted head behind the eyes. The unavailability of type specimens or any other specimens makes it impossible to verify the validity of the discussed species. Many of the features specified by Togashi (1962) in the species description appear to be highly variable in the other two species we studied. Therefore, here we do not give upper the description suggested by Togashi in full, but only the most significant features of this species. The state of such a feature as the furrow of the medial lobe of the mesothorax is highly variable, although it has previously been widely used (Togashi, 1968) for species distinguishing.	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFFFFD57FA1FEA0FC5110E2.taxon	description	Figs 1 A – I, 3 A, D, 4 D – K	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFFFFD57FA1FEA0FC5110E2.taxon	materials_examined	MATERIAL EXAMINED. Austria, Lower Austria, Traimauer, 48 ° 35 ’ 0 N 15 ° 73 ’ 3 E, VII. 2013, E. Altenhofer leg., 6 ♀ (S 008) (ZISP). Russia, Belgorod Prov., vicinity of Nagolnoe village, steppe, 14. VI. 2008, D. Kasparyan leg., 1 ♀ (S 009) (ZISP); Rostov Prov., Rassvet village, 2011, K. Artokhin leg., 4 ♀ (S 012, S 052) (ZISP); Krasnodar Terr.: without locality designation, 13. VI. 2010, V. Shchurov leg., 1 ♀ (S 046) (ZISP); tract Balka Krutaya, near the estuary of the Eya River, 11. IV. 2016, V. Shchurov leg., 16 ♀ (S 075, S 058, S 041, S 032) (ZISP); vicinity of Kazachiy village, 12. IV. 2023, V. Shchurov leg., 1 ♀ (S 040) (ZISP); Voronezh Prov., 25 km NE of Voronezh, vicinity of Venevitinovo village, 9. VI. 2023, D. Kirpach leg., 1 ♀ (S 072) (ZISP), 1 ♀ (VSU); Voronezh, 28. VI. 2023, O. Selivanova leg., 1 ♀ (VSU); Samara Prov., Zhiguli Natural Reserve, forest, Volga River, 2. VII. 2011, V. Chemyreva leg., 1 ♀ (ZISP); Kemerovo Prov., vicinity of Novobachaty settlement, Bayatskie sopki, birch thicket, 23. VI. 2015, A. Kostyunin leg., 1 ♀ (S 045) (ISEA); Khabarovsk Terr., vicinity of Khabarovsk, elm, 16. VIII. 1964, P. Esipenko leg., 2 ♀ (ZISP), same locality, 14. VII. 1964, 24. VII. 1968 & 3. VIII. 1972, A. Shtundyuk leg., 3 ♀ (ISEA); Bolshekhekhtsirskiy Natural Reserve, Cordon Bychikha, 26. V. 2018, 28. V. 2021 (S 035) & 30. VI. 2021 (S 037), V. Dubatolov leg., 3 ♀ (ISEA); Anyuyskiy National Park, Cordon Nilo, 49 ° 15 ’ N 137 ° 16 ’ E, 24 – 25. VII. 2018, V. Dubatolov leg., 1 ♀ (ISEA); Primorskiy Terr.: 20 km S of Ussuriysk, Gornotayezhnaya Station, 31. VII & 4. VIII. 1991, S. Belokobylskij leg., 5 ♀ (ZISP); Arsenyev, Sky-Base “ Bodrost’ ”, 26. V. 2016, K. Kramp, M. Prous & A. Taeger leg., 1 ♀ (S 047) (ZISP); Blue Ridge, 40 km S of Arsenyev, 1 – 4. VII. 1999, V. Krivokhvatskiy & O. Ovchinnikova leg., 2 ♀ (ZISP); vicinity of Spassk-Dal’niy, 23. VII. 1991, 18. VII. 1995, 8. VIII. 1996, 22. VII. 1998, 10. VII. 2001, 26. VI. 2003, & 20. VII. 2006 (S 010), S. Belokobylskij leg., 10 ♀ (ZISP), same locality, 26. VII. 1985, D. Kasparyan leg., 1 ♀ (ZISP); Sudzukhinskiy (= Ussuriyskiy) Natural Reserve, 4. VIII. 1972, V. Kuslitsky leg., 1 ♀ (ZISP); vicinity of Barabash-Levada, floodplain forest, 27. VI. 1980, G. Krivolutskaya leg., 1 ♀ (ZISP); vicinity of Vityaz settlement, 4. VIII. 1982, I. Kerzhner leg., 1 ♀ (ZISP); Ussuriyskiy Natural Reserve, Kamenushka – Kaymanovka, 31. VII. 2008, A. Khalaim leg., 2 ♀ (S 002) (ZISP); 10 km SW of Chernigovka, slopes with oak and pine, 26. VII. 1996, S. Belokobylskij leg., 1 ♀ (ZISP); without locality designation, 30. VI & 22. VII. 1960, Kolyvanova leg., 2 ♀ (ZMMU), 2 ♀ (FSCV); Partizansk, 3. VIII. 1940, A. Romanov leg., 1 ♀ (ZMMU); “ Kedrovaya Pad’ ” Natural Reserve, 9. V. 1983, V. Zlobin leg. & 30. VIII. 1995, S. Belokobylskij leg., 3 ♀ (ZISP); vicinity of Ryazanovka, 9. VII. 1982, I. Kerzhner leg., 2 ♀ (ZISP); vicinity of Anisimovka, 28. V. 1974, Berezantsev leg., 1 ♀ (ZISP); vicinity of Lazo village: 1 – 10. VII. 2006, 6 – 10. VI. 2008, 16 – 30. IV. 2008 (S 042), V. Shokhrin leg., 3 ♀ (ZISP); Lazovskiy Natural Reserve: cordon America 19 – 23. VI. 05, V. Shokhrin leg., 1 ♀ (ZISP), Proselochnaya Bay, 25. VII. 2008, Yu. Sundukov leg., 1 ♀ (S 003) (ZISP); vicinity of Vladivostok, Sputnik, VII. 2024, D. Ryaskin leg., 1 ♀ (ZISP); vicinity of Derchez village, floodplain of Bolshaya Usurka River, 7 – 15. VIII. 2023, M. Sergeev leg., 1 ♀ (S 044) (ZISP).	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFFFFD57FA1FEA0FC5110E2.taxon	description	REDESCRIPTION. Female (after Takeuchi, 1939 with additions). Body length 5.8 – 6.9 mm. Body black, shining, without metallic lustre; labrum dark brown, mandibular apices brown, pronotum partly brownish. Antennae dark brown, scapus light. Legs white, coxae, trochanters and femora more or less yellowish, bases of coxae black, apex of hind tibia and all spurs darkened. Wings faintly evenly infuscated. Veins and pterostigma dark brown. Head entirely (OR distinctly) smooth, unpunctured, its width from above about 3.0 times medial length, strongly constricted behind eyes (dorsal view). Anterior margin of clypeus almost truncated. Supraclipeal area with sharp median keel. Median fossa weak. POL: OOL: OCL = 1.7: 2: 1. Malar space broad, its length approximately equal to length of scapus and pedicellum combined. Antennae short, approximately as long as width of head. Thorax smooth, but not strongly shining; median furrow of prescutum weak. Variability. Spring generation. Head behind eyes (dorsal view) weakly constricted or subparallel. Postocellular area clearly bounded by furrows. POL: OOL: OCL = 1: 1.3: 1. Body entirely black. Antennae black or brownish-black. Legs mostly white; coxae, bases or most part of fore and middle, but sometimes almost all femora except their apices black; apices of tarsi and hind tibiae often darkened. Summer generation. Head behind eyes (dorsal view) subparallel or slightly expanded. Postocellular area clearly bounded by furrows. POL: OOL: OCL = 1.4: 1.6: 1. Due to the high variability of colouration of specimens of summer generations, we apply the concept of colour forms in this paper. Form A. Body dark brown or black. Antenna completely black, rarely dark brown. Legs yellowish-white, less often fore and middle femora black at base. Form B. Body entirely reddish or light brown. Head dark brown, rarely black. Mesonotum with variable dark pattern, often with dark brown spots on middle and lateral or only lateral lobes. Sometimes most of mesonotum dark brown. Tegulae and saw sheath brownish. All antennal segments reddish. Legs entirely white. Male. Unknown. Probably an obligate parthenogenetic species.	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFFFFD57FA1FEA0FC5110E2.taxon	distribution	DISTRIBUTION. Russia [Leningrad Prov. (this is doubtful record and require confirmation), Moscow Prov., * Belgorod Prov., Republic of Krym, Rostov Prov., Krasnodar Terr., Stavropol Terr., Voronezh Prov., Kabardino-Balkarian Republic, Republic of North Ossetia – Alania, Ulyanovsk Prov., * Saratov Prov. (iNaturalist, 2020), Samara Prov., Kemerovo Prov., * Khabarovsk Terr., Primorskiy Terr.], Austria, Belgium, Bosnia and Herzegovina, Bulgaria, Canada, China, Croatia, Czech Republic, Estonia, Germany, Hungary, Italy, Japan, Kazakhstan, Moldova, Poland, Netherlands, Romania, Serbia, Slovakia, Slovenia, Ukraine, USA, Yugoslavia.	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFFFFD57FA1FEA0FC5110E2.taxon	discussion	REMARKS. The holotype of A. leucopoda (Fig. 9 in Blank et al., 2010) preserved at Entomological Laboratory, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka, Japan. The records of this species in the Leningrad Province (Shevchenko & Stcherbakova, 2020), mentioned as the most northern distribution in Russia (Kondratyeva et al., 2023), do not have precise indications and need to be verified. Single specimens were observed in St Petersburg park in 2017 on saplings of Resista-elm (Ulmus resista) imported from Germany, in the year of planting. Further monitoring was not carried out, and the planted trees died (L. N. Shcherbakova, personal communication). It remains unclear whether this species has survived in St Petersburg. No other information is available.	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFAFFD67FA1FC5EFED71004.taxon	description	Figs 2 A – H, 3 B – C, E – F, 4 A – C	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFAFFD67FA1FC5EFED71004.taxon	materials_examined	MATERIAL EXAMINED. Russia, Amur Prov.: Samodon, 100 km W of Svobodnyi, 7. VIII. 1959, A. Zinoviev leg., 1 ♂, 1 ♀ (ZISP); Khabarovsk Terr.: lower reaches of the Anyuy River, tributary of the lower Amur River, 30. VI. 1910, V. Soldatov leg., 1 ♀ (ZISP); 20 km SE of Vyazemskiy, Sobolevo, 29. VII. 1978, D. Kasparyan leg., 3 ♂ (ZISP); Khabarovsk, Arboretum: 25. VI & 20. VIII, 1968, A. Shtundyuk leg., 2 ♂ (ISEA), 31. VII. 1978, D. Kasparyan leg., 2 ♂ (ZISP); Shevki, 15 km S of Bikin, 2. VI. 1983, A. Zinoviev leg., 1 ♂ (ZISP); Khehtsir, Osinovaya River, 7. VI. 1983, D. Kasparyan leg., 1 ♂ (ZISP); vicinity of Vanino, 10. VIII. 1976, Yu. Bodrova leg., 1 ♂ (FSCV); near Khabarovsk, Bolshekhekhtsirskiy Nature Reserve, vicinity of Bychikha cordon, 48.1713 N, 134.4950 E, 28. V. 2021, V. Dubatolov leg., 1 ♀ (S 036) (ISEA); Primorskiy Terr.: vicinity of Spassk-Dal’niy: 19. VIII. 1987, 19. VII. 1991, 5 – 12. VII & 13. VIII. 1995, 21 & 31. VII, 4. VIII. 1998, 8. VIII. 1996 (S 049, S 051), 5 – 7. VIII. 2019, 3. VII. 2001 (S 048, S 056), 26 – 28. VI. 2003, S. Belokobylskij leg., 19 ♂, 6 ♀ (ZISP), 10. VI & 8. VII. 1961, A. Zhelokhovtsev leg., 1 ♂, 1 ♀ (ZMMU); 20 km S of Ussuriysk, Gornotayozhnaya station: 30. VII – 8. VIII. 1948, V. Gussakovskij leg., 2 ♂ (ZMMU), 20. VII. 1981, D. Kasparyan leg., 1 ♂ (ZISP); vicinity of Ussuriysk, 1. VIII. 1966, A. Kupyanskaya leg., 1 ♀ (ZMMU); Sikhote-Alin, 1. VIII. 1936, V. Perelashina leg., 9 ♂ (ZMMU). Suvorovo village, 2 – 9. VII. 1972, A. Ponomarenko leg., 26 ♂, 2 ♀ (ZMMU) (S 059); 17. VII. 1972, A. Ponomarenko, A. Rasnitsyn leg., 1 ♀ (ZMMU); Arsenyev, Sky-Base “ Bodrost ”, 26. V. 2016, K. Kramp, M. Prous, A. Taeger legs, 1 ♂ (ZISP); Zanadvorovka, 7. VI. 1972, A. Ponomarenko, A. Rasnitsyn leg., 1 ♀ (ZMMU); 40 km NE of Spassk-Dal’niy, vicinity of Duchovskoe village, 1. VIII. 1996, S. Belokobylskij leg., 1 ♀ (ZISP) (SEM 0013); 20 km S of Spassk-Dal’niy, nr. Evseevka, 17. VII. 1995, S. Belokobylskij leg., 1 ♂ (ZISP); Grodekovo, 5 – 15. VII. 1965, D. Kasparyan leg., 1 ♂ (ISEA); Partizansk, 7. VII. 1970, A. Shtundyuk leg., 1 ♂ (ISEA); vicinity of Vityaz settlement, 7 – 17. VIII. 1982, I. Kerzhner leg., 2 ♂, 1 ♀ (ZISP); “ Kedrovaya Pad’ ” Nature Reserve: 30. VIII. 1995, S. Belokobylskij leg., 4 ♀ (ZISP), 13. VIII. 2014, V. Chemyreva leg., 1 ♀ (S 001); Ussuriyskiy Nature Reserve: 12. VIII. 1986, V. Makarkin leg., 1 ♀ (FSCV), Kamenushka, 14. VII. 1981, D. Kasparyan leg., 1 ♂ (ZISP), 2. V. 1989, Sidorenko leg., 1 ♂ (FSCV), 25. V. 2003, A. Lelei leg., 1 ♂ (FSCV), 31. VII. 2008, A. Khalaim leg., 3 ♂ (S 063) (ZISP), 23. V. 2016, K. Kramp, M. Prous, A. Taeger leg., 1 ♂ (ZISP), Komarovka River valley: 3. VI. 1989, Sidorenko leg., 1 ♀ (FSCV), 13 – 17. VII. 1981, D. Kasparyan leg., 2 ♂, 1 ♀ (ZISP), cordon Staraya baza, 15 – 16. VII. 1981, D. Kasparyan leg., 9 ♂ (ZISP), cordon Peishula, 30. VII. 1972, V. Kuslitsky leg., 3 ♂ (ZISP); V. Chemyreva leg., 1 ♂ (S 004); vicinity of Anisimovka: 21. VI. 1975, Soboleva leg., 1 ♂ (FSCV), 11. VII. 1977, Azarova leg., 1 ♀ (FSCV), 1. VIII. 2022, P. Romantsov leg., 1 ♂ (ZISP); vicinity of Lazo, 26 – 29. V. 2007, V. Shokhrin leg., 2 ♂ (ZISP); Vladivostok: 19. VII. 1979, A. Zinoviev leg., 1 ♂ (ZISP), 8. VIII. 1991 & 5. VII. 2019 (S 005), S. Belokobylskij leg, 2 ♂ (ZISP); Ryazanovka village, 9. VII. 1982, I. Kerzhner leg., 1 ♀ (ZISP); 125 km SE of Dalnerechinsk, Pozhiga village, 19 – 22. VII. 1983, D. Kasparyan leg., 5 ♂ (ZISP); Kishenevka village, 23 – 30. V. 2008, V. Shokhin leg., 1 ♀ (S 006) (ZISP); 24 km W Anuchino, 9. VII. 1969, Tanaseichuk leg., 1 ♂ (ZISP); Lazovsky Nature Reserve, Korpad’ cordon, 16 – 19. VII. 2005, Yu. Sundukov, V. Shokhin legs, 1 ♂ (FSCV).	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFAFFD67FA1FC5EFED71004.taxon	description	REDESCRIPTION. Female. Body length 5.4 – 5.7 mm. Body black, shining; mouthparts whitish; legs yellowish-white, coxae, most part of femora except apex black, apical segments of tarsi and hind tibiae often darkened. Flagellum orange or brown, often blackish at base and along posterior side. Basal halves of abdominal tergites mostly semi-transparent, sometimes whitish, membranous. Wings hyaline, veins and pterostigma dark brown, whitish at base. Pubescence of body silvery-white. Head mostly smooth, almost without punctures; frons and vertex convex, face very narrow, linear, with sharp keel; interantennal fovea small, rounded, placed above antennal sockets; clypeus flat, truncated along dorsal margin; malar space broad, almost equal to scapus and pedicellum combined. Sheath of saw simple, rounded in lateral view. Lancet as in A. leucopoda. Variability. Spring generation. Head behind eyes (dorsal view) weakly constricted or subparallel. Flagellum brownish-red. Body black. Legs yellowish-white, femora except apex black. POL: OOL: OCL = 1.2: 1.5: 1.0. Summer generation. Head behind eyes (dorsal view) strongly constricted. Flagellum reddish. Body black or dark brown. Legs yellowish-white, fore and middle femora black at base, less often entirely white or with black markings on all femora. POL: OOL: OCL = 1.5: 1.7: 1.0. Male (after Mocsáry, 1909 and Malaise, 1931; for additional information see Choi et al., 2015). Body length 4.0 – 4.5 mm. Body black, shining, smooth; mouth parts whitish; legs black, trochanters, knees, tibiae and tarsi dirty white, apices of hind tibia and surface of hind tarsi blackened; third antennal segment light brown, its base and two basal segments brownish-black; three basal tergites of abdomen translucent, whitish at base; wings uniformly infuscated, veins and pterostigma dark brown. Pubescence silvery-white. Frons in lateral view rounded, elevated; antennal furrows very broad and deep, lower part of face strongly impressed, frons between antennae linear. Clypeus truncated. POL: OOL: OCL = 0.9: 1.4: 1. Malar space broad. Head behind eyes (dorsal view) slightly narrowed.	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFAFFD67FA1FC5EFED71004.taxon	distribution	DISTRIBUTION. Russia (Amur Prov., Khabarovsk and Primorskiy Terr.), South Korea (Choi et al., 2015), Japan, Iran (Chelav et al., 2008).	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
1C1D7E5EFFFAFFD67FA1FC5EFED71004.taxon	discussion	REMARKS. The number of males significantly higher than females in the collection materials. Probably males have mass flights (swarming). The original description of this species and its junior synonym, Aproceros umbricola Malaise, is given by authors for males. Here we give the description of the females on the basis of the examined material, the species identity of which is confirmed by molecular data.	en	Basov, S. A. (2025): SPECIES OF THE GENUS APROCEROS MALAISE, 1931 (HYMENOPTERA: ARGIDAE) OF THE RUSSIAN FAUNA: MOLECULAR GENOTYPING RESOLVES MORPHOLOGICAL PROBLEMS. Far Eastern Entomologist 529: 1-24, DOI: 10.25221/fee.529.1, URL: https://doi.org/10.25221/fee.529.1
