Review of the genus Siemssenius Weise, 1922 (Coleoptera: Chrysomelidae: Galerucinae) from Taiwan, with descriptions of five new species Author Lee, Chi-Feng text Zootaxa 2016 4158 3 367 384 journal article 10.11646/zootaxa.4158.3.4 12a16235-46e5-476e-85e2-068df3c490a9 1175-5326 258327 09EB32FE-9637-479F-8644-972A86B64C8D Siemssenius rufipennis group Diagnosis. Length 8.3–12.7 mm , width 3.9–6.4 mm . General color of adults black, only elytra red or reddish brown, last two abdominal ventrites dark reddish brown, sometimes all abdominal ventrites reddish brown ( Figs 6 A–6B). Antenna filiform, relatively longer in male ( Fig. 9 A), as long as body, antennomeres III–V apically widened, length ratios of antennomeres III to XI about 1.0: 1.3: 1.3: 1.3: 1.3: 1.1: 1.3: 1.2: 1.5, and length to width ratios of antennomeres III to XI about 2.9: 3.7: 4.0: 4.4: 4.6: 4.2: 4.7: 5.1: 7.8; relatively shorter in female ( Fig. 9 B), about 0.8x as long as body, antennomeres III–V apically widened, length ratios of antennomeres III to XI about 1.0: 1.3: 1.3: 1.3: 1.3: 1.3: 1.2: 1.1: 1.4, and length to width ratios of antennomeres III to XI about 3.2: 4.1: 3.9: 4.5: 4.5: 4.8: 4.8: 4.6: 6.5. Apical margin of abdominal ventrite V with two well developed incisions in male, surface with deep, wide, longitudinal groove, apically expanding into most of area between incisions; relative longer than in the S. metallipennis group; apical margin of ventrite IV with very small incision midway ( Fig. 9 E). Ventrite V not modified in female, apical margin rounded, disc without depression; apical margin of ventrite IV straight. Dense setae along apical margins of triangulate processes on abdominal ventrite VIII in female ( Figs 7 D, 8E, 10D, 11D).