Philhygra yokkaichiana (Bernhauer, 1907)

(Figs. 1 G, 8)

Atheta (Metaxya) yokkaichiana Bernhauer, 1907: 410 (as valid species).

Atheta (Metaxya) unzensis Cameron, 1933: 211 (as valid species).

Atheta (Hygroecia) yokkaichiana: Brundin, 1944: 189 (as valid species).

Atheta (Metaxya) unzensis: Sawada, 1977: 177 (as synonym of Atheta yokkaichiana). Atheta (Philhygra) yokkaichiana: Sawada, 1977: 177; Paśnik, 2001: 207; Smetana, 2004: 39. (as valid species).

Description. Body length 2.4–3.0 mm. Body (Fig. 1 G) relatively narrow and elongate. Head usually black; antennomeres and pronotum dark brown, elytra brown; abdominal tergites dark brown to black, posterior margin of each tergite paler; legs yellowish brown. Head surface glossy, with fine punctation, distance between punctures 1.0–3.0 times longer than their diameter; head approximately 1.05–1.10 times longer than wide, widest at basal half; eyes slightly prominent; about 1.25 times longer than tempora; antennomere 4 slightly elongate, 5–10 about as long as wide, 11 about as long as preceding two combined (Fig. 8 A); labrum slightly emarginate in anterior margin; a-sensillum relatively long and pointed at apex; medial pseudopores absent, lateral pseudopores present in prementum. Pronotum (Fig. 8 B) slightly transverse, approximately 1.15 times as wide as long, widest at anterior third; pubescence in midline directed anteriorly; with fine punctation, distance between punctures 0.5–1.0 times longer than their diameter; metanotal scutum with one long seta and about 3–5 relatively short setae on each side of midline; mesoventral process narrow and slightly pointed at apex; length ratio of mesoventral process, isthmus and metaventral process 5:2:1 (Fig. 8 C). Elytron approximately 1.85 times as long as wide, postero-lateral margin nearly straight; flabellum with 14–16 setae present. Male tergite VIII (Fig. 8 D) with 4 macrosetae on each side of midline, posterior margin truncate; posterior margin of male sternite VIII more or less round with 7 macrosetae on each side of midline and moderately long marginal setae; posterior margin of female tergite VIII similar to male tergite VIII, posterior margin of female sternite VIII broadly round with inconspicuous marginal setae. Aedeagus as in Figs. 8 E–G.

Material examined. KOREA: Chungnam prov.: 3 ex., Gongju-si, Gyeryong-myeon, Naeheung-ri, 8 v 1996, P Tripotin; Gyeongbuk prov.: 4 ex., Gimcheon-si, Daehang-myeon, Jikjisa, 13 v 1989, KJ Ahn, near stream; Gyeonggi prov.: 23 ex., Incheon-si, Bupyeong-gu, Bugae-dong, 19 v 1996, YB Cho.

Distribution. China, Japan and Korea (Smetana 2004).