Journal 
The family Halictidae (Hymenoptera) is a large taxonomic group containing more than 3,500 species, and commonly found in all regions of the world (Danforth et al., 2008). Species of the Halictidae tend to be attracted to people's sweat, so they are commonly called sweat bees. Sweat bees generally eat nectar and pollen and create habitats in the ground, clay soil, or riverbanks (Eaton and Kaufman, 2007). The genus Halictus Latreille, 1804 has 206 species recorded worldwide and is characterized by social polyethism, so it plays a significantly important role in the study of social behavior of insects (Murao and Gibbs, 2019;Soucy, 2002;Schwarz et al., 2007). In previous studies, two species (Halictus rubicundus Christ, 1791; Halictus tsingtouensis Strand, 1910) are recorded in South Korea. Halictus hedini hedini Blüthgen, 1934 is distributed in Japan, China, Russia, Serbia, and Kazakhstan (Pesenko, 2005), and was discovered in Korea for the first time in this study. This species has similar morphological characteristics with Halictus rubicundus (Murao and Gibbs, 2019). The description, diagnosis, distribution and illustrations are provided.
Materials and Methods
Materials of the halictid were collected by sweeping. The species studied are deposited in Kunsan National University (KSNU). For information related to species identification, we referred to the paper in Murao and Gibbs, 2019. The terminology used for morphological characters follows Pesenko (2005). For observation and photography, LEICA DMC2900 digital camera and LEICA M205 C microscope (Leica Geosystems AG, Germany) were used. Images were stacked by using Helicon software (Helicon Soft, Ukraine).
Systematic Accounts
Family Halictidae Thomson, 1869
Subfamily Halictinae Thomson 1869
Genus Halictus Latreille, 1804
Halictus Latreille, 1804: 84(85): 238
Lampralictus Pesenko, 1984: 63(2)
Halictus hedini hedini Blüthgen, 1934 (Fig. 1A-F) 주름꼬마 꽃벌(신칭)
Halictus hedini hedini Blüthgen, 1934 : 27 (13): 5-6
Description
Morphology. Female Body. Length of body 11.95 mm, length of forewing 8.09 mm, antennae with 12 segments (Fig. 1A, C). Male. Antennae with 13 segments and long more than more than female.
Head. Antennae dark brown; antennae densely covered short setae; scape covered with yellowish setae and scape basal long setae present (Fig. 1B), length of head 0.78× width of head, frons and clypeus flat and rough, malar space narrow, mandible well-developed and with few setae, maxillary palp with 6 segments and 0.32× length of head, occipital carina absent. Mesosoma. Punctate with setae; parapsidal line present, tegula glossy with yellowish setae, axilla densely covered whitish setae, propodeal triangle faintly present, length of mesosoma 0.68× length of metasoma (Fig. 1E). Hind leg. Dark black with yellowish setae; length of hind leg fumer 0.92× length of hind leg tibia, tibial spurs developed. Wing. Forewing; prestigma absent; length of stigma 0.18× length of forewing, radius hardened, marginal cell and submarginal cell completely present (Fig. 1C). Metasoma. Tergum segments end covered whitish setae; rough and punctures; length of tergum1 1.4× length of tergum1 (Fig. 1F).
Diagnosis.Halictus hedini hedini differs from Halictus hedini hebeiensis by the dark legs of the female. Halictus hedini hedini differs from the similar species Halictus rubicundus in that the first tergum is rough and has deep punctures (Pesenko and Yanru, 1997). Halictus tsingtouensis differs from Propodeum punctate on lateral and posterior surfaces in female and male genal area deeply concave; male second flagellomere approximately 2.4× first flagellomere (Murao and Gibbs, 2019).
Distribution. South Korea (new record), China, Mongolia, Japan, Russia, Siberia, Kazakhstan (Murao and Gibbs, 2019).
Specimens examined. South Korea, 1♂, Nohyeong-dong, Jeju-si, 18.Ⅶ.2001, Heungsik Lee; 1♂, Mt. Gariwang, Jeongsun- eup, Jeongsun-gun, Gangwon-do, 30.Ⅶ.2013, Heungsik Lee; 1♂, Mt. Baekam, Hongcheon-gun, Gangwon-do, 24. Ⅴ.2002, Heungsik Lee; 1♀, Mt. Odae, Daegwallyeong-myeon, Pyeongchang-gun, Gangwon-do, 27.Ⅶ.2001, Heungsik Lee.
Key to Japanese Species of Halictus (Pesenko, 2005)
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♂♀: metapostnotum coarser rugose; metasomal terga coarser (puncture diameter on disc of T2, 12–20 μm) and sparser punctate, mesoscutum and metasomal terga denser punctate, shagreened on interspaces, mat. ♂: genal area deeply concave, with a carina along outer margin of depression; flagellomeres convex on lower side, covered with dense short hairs forming distal and proximal bands divided by bare area about 1/2–1/3 length of segment; metasoma nearly cylindrical, hair band on T3 interrupted; dorsomedial hair tassel of gonostylus twice narrower and sparser. ♀: head rounded in frontal view, about as high as wide.· ······H. (Monilapis) tsingtouensis
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- ♂♀: metapostnotum finer rugulose; metasomal terga finely and densely punctate. pubescence of head and mesosoma yellowish: yellowish white in male, yellowish fuscous in female; propodeum about 0.7 times as long as scutellum. ♂: genal area convex, without carina; flagellomeres nearly cylindrical, covered with inconspicuous hair fringe (except for H. hedini, in which flagellum provided with a fringe of short hairs); metasoma flattened. T5 without posterior band; lower gonostylus short, pointed, spinelike, hairless ♀: relative height of head variable.············ ··························································· 2
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♂♀: T1 at least twice finer punctate, punctures superficial and indistinct; body length 9.5-11.0 mm. ♂: pubescence of flagellum inconspicuous. ♀: T5 around longitudinal bar area with grayish fuscous or dark fuscous pubescence ······· H. (Protohalictus) rubicundus
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- ♂♀: T1 coarsely punctate, punctures deep; body length 11.5-13.0 mm. ♂: flagellum provided with a fringe of short eyelash-like hairs 0.3-0.5 times as long as flagellomeres diameter. ♀: T5 around longitudinal bar area with rusty-brown pubescence. legs dark (black or dark fuscous) entirely or hind tibia and tarsus dark brownish orange ···· ······································H. (Protohalictus) hedini hedini
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