Atholus bimaculatus (Linnaeus)

Hister bimaculatus Linnaeus, 1758, 358; Paykull, 1811, 34; Marseul, 1854, 582, t. 10, f. 142 [8e groupe]; Schmidt, 1885, 294 [Hister (VIII Gruppe)].

Hister (Atholus) bimaculatus: Ganglbauer, 1899, 369; Auzat, 1916, 93.

Hister (Atholister) bimaculatus: Reitter, 1909, 286.

Hister (Peranus) bimaculatus: Bickhardt, 1910, 52 [catalogued]; Bickhardt, 1917, 192.

Atholus bimaculatus: Lewis, 1906, 402; Mazur, 1984, 211.

Atholus (Euatholus) bimaculatus: Kryzhanovskij & Reichardt, 1976, 385; Hisamatsu & Kusui, 1984, 17 [noted; key]; Hisamatsu, 1985, 228, pl. 41, f. 61 [noted; key; photo].

Peranus bimaculatus: Lewis, 1910, 56.

Hister fimetarius Scopoli, 1763, 13, synonymized by Fabricius, 1775, 53.

Hister diluniator Voet, 1793, 46.

Hister apicatus Schrank, 1798, 452, synonymized by Hoffman, 1803, 50.

Hister erythropterus Fabricius, 1798, 38, synonymized by Schonherr, 1806, 94.

Hister obliquus Say, 1825, 37, synonymized by J. L. LeConte, 1859, 264.

Hister bimaculatus ab. morio Schmidt, 1885, 296.

Hister bimaculatus var. spissatus Rey, 1888, 4.

Hister bimaculatus Linnaeus, 1758, 358.

Peranus bimaculatus: Mazur, 1970, 60 [Korea].

Atholus bimaculatus: Ohara, 1992c, 169.

Atholus (Atholus) bimaculatus: ESK & KSAE, 1994, 137 [Korea].

Ohara (1993)

Description. Male and female. Body length, PPL: male, 3.71 - 4.28 mm, female, 4.05 - 4.66 mm, PEL: male, 3.05 - 3.76 mm, female, 3.71 - 3.38 mm. Width: male, 2.48 - 3.05 mm, female, 2.76 - 3.05 mm. Biometric data are given in Table 1. Body oblong-oval and shining. Elytra with red spots, rest of body black; antennae, tibiae and tarsi dark brown.

Frontal stria of head (Fig. 1 A) complete, carinate and inwardly angulate at middle on anterior portion; disk densely covered with coarse punctures which are separated by about their diameter. Labrum short, transversely oblong.

Pronotal sides (Fig. 1 B) regularly arcuate and convergent apically. Apical angle acute. Marginal pronotal stria present on apical half along lateral margin, and broadly interrupted anteriorly behind head. Lateral pronotal stria deeply impressed, the lateral portion sparsely crenate, far distant from lateral margin and abbreviated on basal fifth, the anterior portion nearly straight and densely crenate. Area within the antero-lateral angle of lateral stria feebly excavated and densely and coarsely punctate, the punctures irregularly strewn, being separated from one another by half to two times their diameter; interspace among the coarse punctures sparsely with fine punctures; narrow band along posterior margin covered with large, round and deep punctures. Ante-scutellar area with a short longitudinal puncture.

Marginal epipleural stria clearly impressed on apical half and area outside the stria deeply depressed. Marginal elytral stria deeply and completely impressed, area outside the stria deeply depressed and coarsely punctate. Lateral margin of elytron strongly carinate. Subhumeral stria absent (Fig. 1 B). Oblique humeral stria lightly impressed on basal third. First - 5th dorsal striae deeply impressed, complete and sparsely and coarsely crenate, the basal end of 5th inwardly bent. Sutural stria deeply impressed on apical two-thirds. Disk of elytra sparsely clothed with fine punctures which are separated by three to five times their diameter.

Propygidium (Fig. 9 A) sparsely covered with coarse, ocelloid and deep punctures which are separated by half to twice their diameter, the punctures becoming finer and denser towards margin; interspace among the coarse punctures evenly covered with moderate-sized punctures which are separated by about two times their diameter. Pygidium (Fig. 9 F) irregularly scattered with coarse punctures which are separated by one to four times their diameter, becoming coarser basally; interspace among the coarse punctures evenly and moderately punctate.

Anterior margin of prosternal lobe (Fig. 1 C) triangularly produced, the top rounded; marginal stria deeply impressed and complete, the lateral portion rather distant from the margin; disk evenly and moderately punctate, the punctures becoming coarser and denser laterally. Prosternal keel narrow, the posterior half broad and forming a triangular plane; carinal striae absent; disk sparsely and moderately punctate, the punctures becoming coarser laterally on apical half. Descending lateral stria deeply and completely impressed and strongly carinate.

Anterior margin of mesosternum (Fig. 1 D) outwardly arcuate, the median portion slightly emarginate; marginal stria complete, deeply impressed and densely crenate, a short stria present behind the antero-lateral angle on each side; disk sparsely scattered with coarse punctures and intermingled with fine punctures among coarse ones. Mesometasternal suture straight, clearly impressed and complete. Post-mesocoxal stria extending obliquely along posterior margin of mesocoxa, the outer end attaining middle of the lateral disk of metasternum. Lateral metasternal stria deeply impressed, carinate and obliquely extending posteriorly, the apical end attaining to basal two-thirds of the disk, and not united with oblique stria which inwardly extends from the apical two-thirds of metasterno-metepisternal suture. Intercoxal disk of metasternum sparsely scattered with moderate punctures which are separated by four to five times their diameter. Lateral disk densely covered with large, round and shallow punctures; surface with short hairs.

Punctation of intercoxal disk of 1st abdominal sternum similar to that of intercoxal disk of metasternum; lateral stria deeply impressed and complete.

Protibia well expanded apically, with 5 denticles on outer lateral margin, the basal one very small and the apical two appressed together on apical angle; 2 small denticles present on apical margin. Profemoral stria abbreviated on basal fourth, and most distant from the posterior margin at middle. Mesotibia with 2 rows of strong spines on outer margin, the dorsal one consisting of 7 spines, of which apical three are very long, the ventral one consisting of 8 spines which are shorter than those of dorsal one. Metatibiae with 2 rows of strong spines on outer margin, the dorsal one consisting of 8 spines, the 3 spines on apical angles very long, and the ventral one consisting of 7 short spines.

Male genitalia as shown in Fig. 2 A - F.

Female genitalia as shown in Fig. 2 G.

Remarks. So for as the Japanese species are concerned, A. bimaculatus is easily recognized on the presence of a reddish spot on each elytron.

Table 1. Biometric data for Atholus bimaculatus (Linnaeus).


Part measured Male Female


APW 1.09-1.24 (1.13+0.02) 9 1.14-1.24 (1.21+0.01) 6

PPW 2.28-2.76 (2.45+0.05) 9 2.52-2.76 (2.66+0.04) 6

PL 1.09-1.38 (1.21+0.03) 9 1.29-1.67 (1.43+0.03) 6

EL 1.67-2.09 (1.85+0.04) 9 1.90-2.14 (2.03+0.03) 6

EW 2.48-3.05 (2.66+0.06) 9 2.76-3.05 (2.91+0.04) 6

ProW 1.52-1.81 (1.62+0.03) 9 1.71-1.86 (1.79+0.02) 6

ProL 0.67-0.90 (0.78+0.02) 8 0.81-0.90 (0.86+0.01) 6

PyL 0.86-1.09 (0.95+0.02) 9 0.86-1.05 (0.98+0.03) 6

PTL 0.86-1.00 (0.90+0.02) 9 0.95-1.00 (0.97+0.01) 6

MSTL 0.71-0.90 (0.78+0.02) 9 0.76-0.90 (0.83+0.02) 6

MTTL 0.86-1.05 (0.93+0.02) 9 1.03-1.09 (1.03+0.02) 6


Ohara (1993).

Specimens examined. 9ÅâÅâ and 7ÅäÅä. <Oki Is.> 1Åâ, 1Åä, Urago, Dôzen, 7-VII-1955, Tamu & Tsukamoto leg. (NA); 7ÅâÅâ, 3ÅäÅä, Urago, Dôzen, Oki, 5-VIII-1955, Tamu & Tsukamoto leg. (NA). <Tsushima Is.> 1Åâ, 3ÅäÅä, Hitakatsu, 7-IX-1964, T. Nakane leg. (NA).

Material examined. (Ohara and Paik, 1998).

Korea: Gyeonggi-do: Anyang, 12/v/1965 (1 ex., W. H. Paik).

Distribution. Korea; Japan; Europe; Holoarctic Region; Argentina (introduced); Chad (introduced); India; Thailand.