Hister sedakovii Marseul, 1861, 548; Jakobson, 1911, 645 [Korea]; Mazur, 1970, 59 [Korea]; Kryzhanovskij and Reichardt, 1976, 328 [Korea].
Hister sedakovi (sic): ESK & KSAE, 1994, 137 [Korea].
Hister czikanni Csiki in Horvath, 1901, 106, synonymized by Lewis, 1903, 425.
Hister falsus var. fraudator Bickhardt, 1912, 291, synonymized by Bickhardt, 1917, 185.
Body oblong-oval, feebly convex, black and shiny; tibiae and antennae reddish brown. Body length, PPL male 4.49 4.86 (4.58 ± 0.048) 7, female 4.93 5.27 (5.1 ± 0.17) 2, PEL male 3.67 4.05 (3.84±0.063) 7, female 3.74 4.66 (4.20 ± 0.459) 2; width male 2.96 3.33 (3.11±0.051) 7, female 3.16 3.69 (3.40±0.238) 2. Biometric data given in Table 1.
Frontal stria complete and carinate, the anterior portion straight and the lateral portion angulate; supraorbital stria absent; disk flat, finely punctate, the punctures separated by 1 2 times their diameter, the interspace between the punctures covered with alutaceous microsculpture. Mandible with distinct carina on apicolateral side; disk depressed and coarsely punctate.
Pronotal sides (Fig. 6C, D) regularly curved and convergent apically; apical angle round. Marginal pronotal stria complete laterally and slightly interrupted anteriorly on median one-third to one-fifth. Outer lateral stria shortened on latero-basal one-fifth, and interrupted anteriorly on median three-fifths. Inner lateral stria complete, the median portion feebly crenated. Disk sparsely scattered with fine punctures, wholly covered with alutaceous microsculpture. A row of coarse punctures present along the posterior margin. Antescutellar area with a short longitudinal impression.
Epipleura of elytra excavated; marginal epipleural and marginal elytral striae well impressed and complete; subhumeral stria wanting; oblique humeral stria lightly impressed on basal third; first third dorsal elytral striae complete, slightly abbreviated basally; the third slightly bent inwardly on basal half; fourth dorsal stria shortened on basal one-third; fifth dorsal stria variable, present on apical one-third to absent, usually present on apical one-sixth; sutural stria present on apical half. Disk of elytra sparsely covered with fine punctures, rarely with moderate punctures, that are separated by about 3 times their diameter.
Propygidium irregularly covered with large, round, shallow punctures that are separated by half to 4 times their diameter, the punctures becoming finer and sparser medially; interstices between the punctures sparsely and finely punctate. Pygidium convex, the anterior area flat; disk sparsely covered with coarse punctures on basal area, the punctures separated by 1 to 2.5 times their diameter and become sparser apically.
Anterior margin of prosternal lobe round; marginal stria complete, another short stria present laterally; disk of lobe convex medially and evenly covered with coarse punctures that are separated by 1 to 3 times their diameter. Prosternal keel convex; carinal stria absent; lateral stria completely impressed and strongly carinate; disk coarsely punctate along lateral stria.
Anterior margin of mesosternum feebly emarginate, its marginal stria distinctly impressed and carinate; another short stria present behind antero-lateral angle on each side; disk sparsely covered with fine punctures that are separated by 4 to 5 times their diameter. Meso-metasternal suture well impressed and slightly carinate. Lateral metasternal stria completely impressed and carinate, obliquely and posteriorly extended, and the apical end united with an oblique stria that inwardly extends from the middle of the metasterna-metepisternal suture; lateral disk densely covered with large, round, shallow and setiferous punctures that are separated by one-third to half their diameter. Post-mesocoxal stria of metasternum well impressed along posterior of mesocoxa and become more distant from the margin laterally, the lateral portion nearly straight. Punctation of intercoxal disk of metasternum similar to that of the intercoxal disk of mesosternum. Intercoxal disk of first abdominal sternum completely striate on each side, but the striae are usually slightly interrupted and bent at middle.
Protibia with 4 denticles on outer margin, the basal one small and apical one with 2 spinula. Meso- and metatibiae with 2 rows of 8 10 long and stout spinula on outer margin.
Male genitalia as shown in Fig. 8. Aedeagus short and stout; lateral sides of parameres straight on basal two-thirds, then a little divergent apically at apical one-third , thence strongly convergent on apical one-sixth; process on midline of ventral side well developed and strong; ratio of parameres length to basal piece length about 2.81.
Material examined. Pyeonganbug-do: Taiyudong, 20/ix/1924 (1 ex., [NSMT-I-C-23214, Kono coll.], 1 male [EHU, Kono coll.], B. Efremoff), 1925 (1 male & 1 female [EHU, Kôno coll.], E. Gallois); Mt. Pong-san, Pukdo, 22/vi/1997 (4 males & 1 ex., Kim); Shineuju City (= Sin-cu-ju), northeast 2 km, 9/vii/1993 (4 exs., J. K. Lee). Seoul City: Seoul, 5/v/1922 (1 ex. [NSMT-I-C-23215, Kono coll.], no collector's name), 8/viii/1918, 5/iii/ 1919, (1 female, 2 exs. [EHU, Kono coll.], E. Gallois).
Remarks. H. sedakovii resembles H. coreanus; however, the large body size, the short fourth, fifth and sutural dorsal striae of elytra, and the shape of eighth sternum, spicule and aedeagus of the male genitalia of H. sedakovii will distinguish it from H. coreanus.
