Hypocaccus asticus Lewis, 1911: 89 [Japan: Enoshima].
Japanese name: Hime-hamabe-emma-mushi.
Hypocacculus (Nessus) asticus: Ohara, 1994, 240; ESK & KSAE, 1994, 136 [Korea].
Description. Body lengh, PPL, 2.16 - 2.39 mm (2.26 ± 0.06, n=3); PEL, 1.83 - 2.06 mm (1.95 ± 0.05, n=3). Width, 1.60 - 1.80 mm (1.70 ± 0.05, n=3). Body oval and strongly convex. Biometric data are given in Table 48. Cuticles very strongly shining and black or nearly so with a strong bronze or brassy lustre, but in an observed specimen dark rufopiceous, lacking the metallic lustre; antennae dark rufopiceous with club rufotestaceous; legs dark reddish brown.
Frontal stria of head (Fig. 138C) complete and strongly carinate, straight anteriorly, and its sides parallel to each other and straight. Disk of front with an irregular and shallow depression wholly, as shown in fig. 127C. Epistoma scabrous.
Pronotal sides (Fig. 138A) feebly arcuate and not strongly convergent on basal five-sixths, thence strongly arcuate and convergent to apices. Apical angles round. Disk densely covered with coarse and round punctures except on mediobasal area, the punctures becoming deeper on longitudinal lateral area along the sides; base with two or three rows of coarse punctures, occasionally with fine punctures intermingled; sparsely clothed with microscopic punctures narrowly along the sides and on mediobasal areas.
Epipleura of elytra smooth, sparsely clothed with microscopic punctures. Marginal epipleural stria complete and distinctly carinate. Marginal elytral stria strongly carinate, complete, and extending along posterior margin of elytra, its apical end attaining to near lateral third of elytron. External subhumeral stria present on basal fourth. Internal subhumeral stria present on median third and densely with moderate punctures. Oblique humeral stria distinctly impressed and present on basal third. First and 2nd dorsal striae present on basal two-thirds; the basal end of the 2nd extending inwards. Third dorsal stria a little shorter than the 2nd. Fourth dorsal stria present on basal half, its basal end united with the end of sutural stria in an arch. First to 4th dorsal striae densely crenate with moderate punctures. Sutural stria complete and sparsely crenate with moderate punctures. Surface of apical half of elytra densely covered with coarse, round, and shallow punctures, which are as coarse as the pronotal coarse punctures and separated by their own diameter to twice the dimeter; basal half, flanks and extreme apex of elytra impunctate.
Propygidium densely covered with coarse punctures, which are a little coarser than the elytral punctures and become finer anteriorly; interspace among punctures with lightly impressed, transverse alutaceous microsculpture on basal half. Pygidium sparsely covered with coarse and transverse punctures, which are a little finer than those of the propygidium and separated by two to three times their diameter.
Anterior margin of median portion of prosternum (Fig. 138B) round. Preapical foveae distinct and large. Keel moderately compressed, its apex narrowly truncate. Descending lateral striae strongly carinate and convergent to apex. Carinal striae nearly parallel and slightly divergent basally on apical half and strongly so on basal fourth. Lateral side of keel coarsely punctate laterally, and with alutaceous microsculpture.
Anterior margin of mesosternum (Fig. 138B) feebly emarginate, its marginal stria distinctly carinate and shortly interrupted medially. Disk very sparsely and moderately punctate. Meso-metasternal suture lightly impressed, and sparsely carinate with large punctures. Intercoxal disk of metasternum sparsely clothed with microscopic punctures, which are occasionally coarser medio-apically. Lateral stria strongly carinate, extending obliquely and posteriorly, and reaching near hind coxae. Lateral disk sparsely covered with coarse, round, shallow and setiferous punctures, which are twice as coarse as the propygidial punctures, separated by their diameter, and become sparser and finer apically. Metepisternum coarsely punctate on basal two-thirds and smooth on apical third.
Intercoxal disk of 1st abdominal sternum (Fig. 138B) completely striate laterally, and sparsely and microscopically punctate except for a transverse apical band which is moderately punctate.
Protibia with 7 spines on outer margin, the apical four large and its base strongly dentate.
Remarks. Hypocacculus asticus can easily be recognized by the rugae on the front, the rather small size, the striation of the elytron and the punctation of the pronotum and elytra.
Table 48. Biometeric data of Hypocacculus asticus (Lewis).
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APW 0.69-0.72 (0.71±0.01) 3
PPW 1.47-1.64 (1.56±0.04) 3
PL 0.69-0.82 (0.74±0.03) 3
EL 1.18-1.24 (1.20±0.02) 3
EW 1.60-1.80 (1.70±0.05) 3
ProW 0.98-1.01 (0.99±0.01) 3
ProL 0.23-0.33 (0.28±0.02) 3
PYL 0.95-1.19 (1.06±0.06) 3
PTL 0.59-0.65 (0.63±0.02) 3
MSTL 0.56-0.62 (0.60±0.02) 3
MTTL 0.65-0.75 (0.71±0.02) 3
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[Honshû] <Wakayama-ken> 1 ex., Wakayama-shi, 10/ii/1957, M. Yoshida leg. (NA).
[Kyûshû] <Nagasaki-ken> Maehama, Kazusa-chô,
28/iii/1979, S. Imasaka leg.
Korea: Cheju-do: Chungmun, 24/vii/1993 (1 male, 1 female
and 1 ex., J.-C. Paik).
Japan: [Honshu] Kanagawa-ken: Shichiri-ga-hama, Kamakura (2 exs., 10/x; 1 ex., 24/viii/1989), K. Kawada.