Arthrotus nakanei (Kimoto, 1969) Kimoto, 1969

Lee, Chi-Feng & Bezdek, Jan, 2013, Revision of the genus Dercetina from Taiwan and their similar species, with description of a new species from Myanmar (Insecta, Chrysomelidae, Galerucinae), ZooKeys 323, pp. 1-33 : 23-26

Arthrotus nakanei (Kimoto, 1969) comb. n.

Dercetina nakanei Kimoto, 1969: 65.

Type series.

Holotype ♀ (KUEC): "(Taiwan) Sungkan, 2000m - Tsifeng, 2300m Nantou Hsien / 29.vi.1965 T. Nakane / Japan-U.S. Co-op. Sci. Programme (yellow label) / Dercetina nakanei Kimoto, n. sp. / HOLOTYPE (red label)". Paratypes: 1♀ (KMNH): "(Taiwan) Sungkang Nantou Hsien / 19.v.1965 T. Shirôzu / Dercetina nakanei Kimoto, n. sp. / PARATYPE (blue label)"; 1♀ (KMNH): "(Taiwan) Meifeng Nantou Hsien / 18.v.1965 B.C. Chang / Dercetina nakanei Kimoto, n. sp. / PARATYPE (blue label)".

Material examined.

TAIWAN: 1♀, Hsinchu, Kuanwu, 6.IV.2010, leg. L.-H. Sun (TARI); 5♂♂, 8♀♀, same locality, 30.IV.-1.V.2010, leg. M.-H. Tsou (TARI); 1♂, 1♀, same locality, 30.IV.2010, leg. C.-F. Lee (TARI); 1♀, same locality, 7.VI.2010, leg. L.-H. Sun (TARI); 5♂♂, Nantou, Chingching, 4.IV.2010, leg. Y.-T. Wang (TARI); 6♂♂, 7♀♀, Nantou, Meifeng, 15.IX.2009, leg. H. Lee (TARI); 1♂, same locality, 20.IV.2011, leg. C.-F. Lee (TARI); 2♀♀, Nantou, Sungkang, 4.IV.2010, leg. Y.-T. Wang (TARI); 1♂, 1♀, Nantou, Tsuifeng, 5.IV.2010, leg. Y.-T. Wang (TARI); 1♂, Taichung, Anmashan (= Tashueshan), 15.X.2009, leg. J.-C. Chen (TARI); 1♀, same locality 19.X.2011, leg. C.-F. Lee (TARI); 1♀, same locality, 24.IV.2012, leg. C.-F. Lee; 1♂, Taichung, Henglingshan, 5.VI.2012, J.-C. Chen (TARI);

Diagnosis.

Arthrotus nakanei is easily recognized by its color pattern.

Redescription.

Color (Figs 67-68) black, abdomen and apical 2/3 of elytra reddish brown. Head smooth and impunctate. Pronotum transverse, 1.9-2.0 times wider than long, disc with scattered prominent punctures, and a pair of round fovea at sides; lateral and posterior margins slightly rounded, anterior margin slightly concave. Elytra more or less widened posteriorly, apex convergently rounded, 1.6-1.7 times longer than wide, disc with punctures in part arranged in longitudinal rows, epipleurae smooth and impunctate.

Male. Length 5.2-5.7 mm, width 2.4-2.7 mm. Antenna filiform (Fig. 83), antennomere II a little smaller than III, ratio of length of antennomeres III to XI about 1.0: 5.7: 5.3: 5.6: 5.6: 5.1: 5.1: 5.1: 5.6; ratio of length to width of antennomeres III to XI about 1.2: 5.1: 4.8: 5.3: 5.6: 5.4: 5.7: 5.7: 5.6. Penis (Fig. 85) extremely slender, about 8.9 times longer than wide, lateral margin medially narrowed, apex narrowly rounded, with a short process at top; tectum membranous, with scattered short setae; weakly curved in lateral view, apex recurved and hooklike (Fig. 86); endophallic sclerites elongate, about 0.5 times as long as penis; apically narrowed, apex ventrally covered with a small curved sclerite; with a cluster of long setae from middle to apex; straight in lateral view.

Female. Length 6.0-6.2 mm, width 2.9-3.2 mm. Antenna filiform (Fig. 84), shorter than male, ratio of length of antennomeres III to XI about 1.0: 2.5: 2.4: 2.4: 2.4: 2.1: 2.1: 2.1: 2.2; ratio of length to width of antennomeres III to XI about 2.3: 5.9: 5.7: 5.7: 5.7: 5.3: 5.2: 5.2: 5.5. Sternite VIII (Fig. 87) weakly sclerotized subapically, apex truncate, with dense long setae along apical margin, spiculum extremely long. Spermathecal receptaculum (Fig. 89) strongly swollen; pump narrow and strongly curved, apically narrowed; spermathecal duct short, shallowly projecting into receptaculum. Gonocoxae (Fig. 88) very close at middle, about 5.0 times longer than wide, slightly curved inwards near apex, apex rounded, with one or two short setae at apical 1/3, two subapically, nine setae at apex.

Distribution.

Taiwan.