Eight species of the subgenus Pachydinodes were reported from Palaearctic region (Kirschenhofer, 2003), among them four species, Chlaenius (Pachydinodes) abstersus Bates, C. (P.) pictus Chaudoir, C. (P.) tetragonoderus Chaudoir, C. (P.) virgulifer Chaudoir were reported in Korea up to now (The Entomological Society of Korea and Korean Society of Applied Entomology, 1994; Park and Paik, 2001). Members of this subgenus are characterized and easily distinguished by external morphology, like shapes of elytral spot or bend at apex and colorful diversity at head and pronotum dorsally. These species have well developed hind wing and tarsal claws which can be able to live on the tree flying and catching and feeding the small worms etc. (Nakane, 1986).
Genus Chlaenius Bonelli, 1810
Subgenus Pachydinodes Kuntzen, 1919
Key to species of the subgenus Pachydinodes from Korea
1. Elytra with yellowish spot or bend ？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？2
- Elytra without yellowish spot or bend ？？？？？？？？？？？？？？？？？？？？？？？？？？？ ？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？C. abstersus Bates
2. Elytral spot connected to apex ？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？3
- Elytral spot not connected to apex ？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？C. tetragonoderus Chaudoir
3. Length more 13 mm, head and pronotum with strong reddish coppery luster in dorsal ？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？4
- Length less than 13 mm, head and pronotum with strong green or greenish luster in dorsal ？？？？C. hamifer Chaudoir
4. Spot of elytral apex located at interval 4 to 8 ？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？C. virgulifer Chaudoir
- Spot of elytral apex located at interval 3 to 8 ？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？C. pictus Chaudoir
1*Chlaenius hamifer Chaudoir, 1856 (Fig. 1)
Chlaenius hamifer Chaudoir 1856: 187.
Chlaenius bihamatus Chaudoir, 1856: 187.
Chlaenius queenslandicus Sloane, 1910: 435.
Material examined. Korea: 1♂, Gyeonggi-do, Suwon-si, 22 Jun 1999, Park JK.
Description. Body length 13.0 mm, width 5.2 mm. Head and pronotum with strong greenish shiny, elytra dark brown, pronotum brown at latero-margin part. Antenna, labrum, mandible, palpi and legs yellowish brown. Ventral side black. Head: Relatively long, a little convex, dorsal side punctuate, with longitudinal rugose at laterodorsal area. Clypeus setae normal, antenna pubescent from 4th segment, palpi cyclindrical shape. Pronotum: A little convex, surface distinctly yellowish pubescent and deeply and largely punctuate than head disk, more concentrate at base, base with two fovea, a little wide and long, with transverse mashes at base, basal angle rounded. Elytra: Elongtely elliptic, widest near behind of middle, surface densely pubescent with small punctuate at interval and striae strongly and deeply punctuate, elytral apex with yellowish bend at interval 3 to 8, connected to apex, middle side of bend combined to marginal area of apex. Legs: Yellowish brown, 5th segment of tarsus with ventral setae rows. Aedeagus (Fig. 2): Almost sickle shape, apex very hooked and twisted and concaved on dorsal view, right paramere wide and rounded at least 2.5 times more wide than left one, left paramere narrowed.
Notes. This species identified easily by greenish head and pronotm in dorsal and shape of yellowish bend at elytral apex (Nakane, 1986). And it is very similar to C. virgulifer, but distinguished by size, dorsal color and elytral bend shape.
Distribution. Korea (new record), Arab Emirates, Australia, Bhutan, China, Japan, Nepal, Pakistan, Oriental region.
Korean name: 1*？？？？？？？？？？？？？？(？？？)