Hister (Grammostethus) curvicollis Bickhardt, 1913, 172 [Taiwan: Kankau, Koshun (= Hengchun), Ping-tong Hsien]; Miwa, 1931, 57 [Kôshun]; Kamiya and Takagi, 1938, 31.

Grammostethus curvicollis: Lewis, 1915, 55 [listed].

Margarinotus curvicollis: Wenzel, 1944, 126 [listed].

Margarinotus (Grammostethus) curvicollis: Mazur, 1984, 175 [cataloged].

Description (Ohara, 1999).

Male. PPL, male, 4.0-4.1 mm, female, 4.0 mm, PEL, male, 3.0-3.05 mm, female, 3.05 mm. Width, male, 2.70-3.01 mm, female, 2.7 mm. Biometric data are given in Table 2. Body oval, black and shining; legs, antennae, mouth parts, lateral area of propygidium and a broad area along basal margin of pygidium reddish-brown.

Frontal stria of head (Fig. 4A) complete, subcariniform and regularly curved anteriorly. Disk of head moderately punctate with microscopic punctures intermingled, the punctures becoming coarser along basal margin.

Anterior margin of pronotum (Fig. 4B) bisinuate, the median portion regularly and outwardly arcuate. Marginal pronotal stria complete laterally, and broadly interrupted behind head. Lateral stria complete, subcariniform and strongly crenate, its apical portion behind head regularly arcuate; the stria sometimes interrupted behind eyes. Disk of pronotum evenly covered with moderate punctures and with microscopic punctures intermingled. Antescutellar area feebly depressed and with a longitudinal puncture.

Epipleural fossette sparsely covered with coarse punctures along outer margin. Marginal elytral stria absent. Marginal epipleural stria complete and well impressed. External subhumeral stria (Fig. 4B) complete and deeply impressed. Internal subhumeral stria absent. Oblique humeral stria present on basal third. First ­ 4th dorsal striae complete, well impressed and strongly crenate. Fifth dorsal stria present on apical half, with a long rudiment on basal fourth. Sutural stria complete, usually its basal end connected with basal rudiment of 5th dorsal stria by an arc. Surface of elytra densely covered with fine punctures.

Pygidia feebly alutaceous (Fig. 5C). Propygidium with an elevation on lateral area and a feeble depression behind each posterior angle; surface densely covered with large and shallow punctures, which are separated by their own diameter to one-fourth the diameter; fine punctures intermingled among the large punctures. Punctation of pygidium similar to propygidial one, but sparser and fine, becoming finer apically.

Prosternal lobe rounded at apex (Fig. 4C, 5E), its marginal stria well impressed, subcariniform and complete; disk covered with coarse punctures. Prosternal keel with carinal striae on its whole length.

Anterior margin of mesosternum (Fig. 4C, 5E) nearly straight, its marginal stria complete and subcariniform, and with another short stria behind each anterior angle. Disk of mesosternum sparsely clothed with fine punctures. Meso-metasternal suture complete, subcariniform and sinuate. Lateral stria of metasternum (Fig. 5F) extending obliquely and posteriorly, and united with oblique stria that extends inwards from the middle of metasternal-metepisternal suture. Intercoxal disk of metasternum sparsely clothed with fine punctures, and with coarse punctures along the lateral stria. Lateral disk of metasternum densely covered with large and shallow punctures; without hair.

Intercoxal disk of 1st abdominal sternum striate on each side and finely punctate, the punctures becoming coarser laterally.

Protibia with 8 denticles on external margin (Fig. 4D, E). Profemur with short posterior marginal stria on apical fifth.

Male genitalia as shown in Fig. 6. Ratio in length of parameres to basal piece about 3.5.

Female genitalia as shown in Fig. 4F. Spermatheca consisting of 5 small sacs.

Specimens examined.

[Proper] Taoyuan Hsien: Palin (1 male, 26/iii/1986), M. Ohara. Hsinchu Hsien: Shangping (1 male, 1, 2/v/1986), K. Masumoto. Nantou Hsien: Meiyuan (1 male, 21/v; 1 female, 24/v/1981), Chin-Kin Yu.

Distribution. Taiwan.

Remarks. This species is easily distinguished from the other Taiwanese Histerini by the color pattern of the propygidium and pygidium. Mazur (1975) described an allied species, M. (G.) meridionalis, from India. M. curvicollis belongs to the type of ruficornis in regard of the structures of the male genitalia (Ohara, 1989).

Fig. 4. Margarinotus (Grammostethus) curvicollis (Bickhardt). A: Head, frontal view. B: Pronotum and left elytron. C: Ventral side of adult. D: Left protibia, dorsal view. E: Ditto, ventral view. F: Female genitalia, spermatheca, vagina and bursa copulatrix, lateral view (left side). [A­E: no. 9923, Meiyuan; F: no. 9924, Meiyuan]. (Ohara, 1999). (Ohara, 1999).

Fig. 5. Margarinotus (Grammostethus) curvicollis (Bickhardt). A: Head and pronotum, oblique view. B: Left elytron, oblique view. C: Propygidium and pygidium, caudal view. D: Punctation of pygidium. E: Prosternum, ventral view. F: Mesosternum, metasternum and epipleura of elytron, ventral view. [A-D: no. 9923, Meiyuan, Nantou; E-F: no. 9940, Palin, Taoyuan]. (Ohara, 1999).

Fig. 6. Margarinotus (Grammostethus) curvicollis (Bickhardt). Male genitalia. A: Aedeagus, dorsal view. B: Ditto, lateral view. C: Ninth and 10th tergites, dorsal view. D: Ditto, lateral view. E: Eight tergite and sternum, dorsal view. F: Ditto, lateral view. [A­F: no. 9923, Meiyuan]. (Ohara, 1999).

Histeridae/Histerinae/Histerini/Margatinotus/References