Compsobata dentigera (Loew, 1854)

(Figs 4A–B, 7A, 7C, 8B)

Calobata dentigera Loew, 1854: 24 (sp. nov.)

Compsobata dentigera Ozerov, 1987: 553 (key)

Compsobata (Compsobata) dentigera Hirashima, 1989: 796 (cat.)

Neria dentigera Ozervov, 1999: 506 (key.); Ichige, 2018: 39 (diag.)

Diagnosis. Body length 8.1–8.4 mm in males, 8.2–10.6 mm in females; overall coloration black and orange; head glubose, dark brown with exception of cream white parafacial; head chaetotaxy: 1 frontal, 1 orbital, 1 postocellar, 1 outer vertical bristles present; thorax dark brown dorsally, transitioning to brighter brown in lateral side; dorsal area with sparse, short yellow setae; katepisternum covered with short pale silvery setae, plus dense long weak yellow bristles posteroventrally; legs uniformly yellow with dark brown ring in posterial apices of hind femora, hind tibia without dorsal spines; wings uniformly light brown with no conspicuous markings, halter light brown; tergites dark brown with orange posterior corner, yellow suberect setae present; epandrium yellowish brown; male S5 heartshaped, with characteristic indentation in inner margins of each arm (Figs 7C).

Material examined. South Korea: Gangwon-do: 3♂, 2♀, Jeongseon-gun, Nam-myeon, Yupyeong-ri, Mt. Mindungsan, 17.vi.2011, coll: Ho-Yeon Han et al. (NIBR) ; Jeollanam-do: 1♀, Gurye-gun, Mt. Jirisan, Nogodan, 29.vii.1999, coll: So-Yoon Won (SNUM) ; 1♂, Gurye-gun, Mt. Jirisan, Nogodan, 23.v.1999, coll. K. S. Woo (SNUM) ; 1♂, 1♀ (in copula) Gurye-gun, Mt. Jirisan, Nogodan, 16–20.vi.2009, coll: K.K.Kim & O.S.Kim (NIBR) ; 1♀, Gurye-gun, Mt. Jirisan, Piagol, 28.vii.1999, coll: Hyun-mi Lee (SNUM) ; Jeollabuk-do: 1♀, Gochang-gun, Simwon-myeon, 24.vi.1993, coll: O.Y. Kwon (SNUM) .

Distribution. South Korea * (Gangwon-do, Jeollanam-do, Jeollabuk-do), Japan (Hokkaido), Russia (Far East), Mongolia

Biology. Korean specimens were usually collected at mountainous environments above 1000m altitude.A group of this species was observed at a mountaintop flat with short Poaceae plants at Hadong-gun, Jeollanam-do (Sangsu Kim, personal observation).

Remarks In East Asia, Compsobata huashanica Li, Liu & Yang, 2012 is similar, but can be distinguished from this species by the apical incision of the surstylus, difference in the shape of S5, and absence of a small indentation in the inner margin of the arms of S5 (Fig. 7B).