Hister distans Fischer von Waldheim (Fig. 10, 11)
Hister distans Fischer von Waldheim, 1824, 205 [Siberia]; Marseul, 1857, 164; Schmidt, 1890b, 6; Jakobson, 1911, 644; Kryzhanovskij and Reichardt, 1976, 318.
Hister atramentarius Suffrian, 1855, 142.
Hister dauricus Marseul, 1861, 533.
Male. Body oblong-oval, black and shiny; tibiae, tarsi and antennae dark reddish brown. Body length, PPL 7.54, PEL 6.00, APW 1.9, PPW 4.35, PL 1.93, EL 3.31, EW 5.04, ProW 3.20, ProL 1.00, PyL 1.24, PTL 1.70, MSTL 1.50, MTTL 1.80.
Frontal stria of head (Fig. 10A) complete, well impressed and carinate, the anterior portion straight; disk of head even and densely covered with coarse punctures that are separated by their own diameter. Mandible with distinct carina on lateral side; disk feebly depressed.
Pronotal sides (Fig. 10B) gradually convergent apically on basal five-sixths, the apical sixth strongly convergent. Apical angles acute. Marginal pronotal stria complete laterally and interrupted behind head. Outer lateral pronotal stria present on apical one-third and densely and finely crenate. Inner lateral stria complete and coarsely crenate, the anterior portion nearly straight. Disk of pronotum sparsely clothed with microscopic punctures that are separated by 5 to 10 times their diameter. Antescutellar area with a short longitudinal impression.
Epipleura of elytra feebly excavated. Marginal epipleural stria well impressed and carinate on apical half. Marginal elytral stria complete and carinate. External subhumeral stria deeply present on basal half, the posterior end united with the anterior end of internal subhumeral stria. Internal stria present on apical half and represented by coarse and deep punctures. Oblique humeral stria lightly impressed on basal one-third. First - third dorsal striae complete, deeply impressed and sparsely and coarsely crenate; fourth dorsal stria present on apical half; fifth dorsal stria on apical one-third; sutural stria on apical half and represented by a few coarse punctures on basal half. Disk of elytra evenly covered with fine punctures that are separated by 4 8 times their diameter.
Propygidium with large depression on each side; disk irregularly covered with large, round and deep punctures that are separated by 1 7 times their diameter, the punctures absent on middle of posterior margin; interspace between large punctures covered with fine punctures that are separated by 2 10 times their diameter (Fig. 10D). Pygidium densely covered with large punctures that abut each other or are separated by about half of their diameter; apex of pygidium without coarse punctures; interspace between coarse punctures sparsely covered with fine punctures (Fig. 10E).
Anterior margin of prosternal lobe (Fig. 10F) round, its marginal stria complete and carinate, the posterior ends deeply excavated; disk of lobe evenly and coarsely punctate, the punctures separated by about 3 times their diameter and become sparser medio-posteriorly; lateral sides of disk with longitudinal excavation. Prosternal keel without carinal stria, its disk sparsely covered with coarse punctures that are separated by 3 4 times their diameter. Lateral descending striae of keel complete and strongly carinate.
Anterior margin of mesosternum narrowly and strongly emarginate medially; marginal stria complete and carinate; another short stria present behind antero-lateral angle; punctation of disk similar to that of prosternal keel. Meso-metasternal suture lightly but distinctly impressed and feebly angulated at middle. Post-mesocoxal stria of metasternum strongly carinate along posterior margin of mesocoxa, becoming more distant from the margin laterally. Lateral metasternal stria well impressed, carinate and extending posteriorly and obliquely, the apical end attaining near apical one-third of metasternum, not united with an oblique stria that inwardly extends from the middle of the metasternal-mesepimeral suture; the oblique stria strongly carinate. Lateral disk of metasternum densely covered with large, round, shallow and setiferous punctures, the punctures becoming smaller medially. Punctation of intercoxal disk of metasternum similar to that of intercoxal disk of mesosternum, the punctures becoming sparser medially. Intercoxal disk of first abdominal sternum completely striate on each side.
Protibiae with 4 teeth on outer margin, the basal one small and the apical with 2 spinula. Profemoral stria present on basal one-third. Meso- and metatibiae with 2 rows of long and stout spinula on outer margin.
Male genitalia as shown in Fig. 11. Lateral sides of parameres straight on basal two-thirds and a little curved outwardly on apical one-third; ratio of parameres length to basal length about 3.46.