Macroplea

Lou, Qiaozhe, Yu, Peiyu & Liang, Hongbin, 2011, Two new species of Macroplea Samouelle (Coleoptera: Chrysomelidae: Donaciinae) from China, with a key to all known species, Zootaxa 3003, pp. 1-21 : 3

Key to species of Macroplea

1 Punctures along elytral striae coarse, not arranged in paired rows ( Figs 24, 26, 31); antenna relatively short, not extending beyond middle of elytron ( Figs 24–27); metatarsus with apical tarsomere as long as basal three combined ( Fig. 39); hypomeron with an oblong supracoxal pubescent patch ( Fig. 32); BL = 5.4–8.5 mm. China (Sichuan).............. M. ranina sp. nov.

- Punctures along elytral striae fine, arranged more or less in paired rows ( Figs 1, 3, 50–53); antenna relatively long, extending beyond middle of elytron ( Figs 1–3, 50, 52, 53); metatarsus with apical tarsomere more than 1.2 times as long as basal three combined ( Figs 10, 68, 70, 71); hypomeron with at most a small triangular supracoxal pubescent patch ( Figs 14, 54)....... 2

2 Pronotum and elytron pubescent, with conspicuous dense long hairs ( Figs 57, 61); elytron without spine at outer apical angle ( Fig. 65); pronotum without black spots or stripes on disc ( Fig. 57); BL: 5.0–8.6 mm. China (Heilongjiang, Ningxia, Gansu, Xinjiang (Aksu)); Finland........................................................ M. pubipennis ( Reuter, 1875)

- Pronotum and elytron glabrous or with very sparse short hairs ( Figs 5, 8, 56, 58, 59, 60, 62, 63); elytron with spine at outer apical angle ( Figs 12, 64, 66, 67); pronotum with black spots or stripes on disc ( Figs 5, 56, 58, 59)........................ 3

3 Pronotum without coarse black punctures near apical and basal margin, medial longitudinal groove shallow, not black ( Figs 58, 59); hypomeron without supracoxal pubescent patch; second metatarsomere longer than or equal to first ( Figs 70, 71)...... 4

- Pronotum with coarse black punctures near apical and basal margin, medial longitudinal groove deep, black ( Figs 5, 56); hypomeron with a small triangular supracoxal pubescent patch ( Figs 14, 54); first metatarsomere much longer than second ( Figs 10, 68)......................................................................................... 5

4 Median lobe of aedeagus relatively robust, apex with a denticle ( Figs 77, 78); elytral outer apical spine generally long, with base narrow ( Fig. 66); seond metatarsomere longer than first ( Fig. 70); body relatively large, BL: 5.9–7.7 mm. China (Xinjiang (Altay)); Siberia; Middle Asia; Europe; Algeria..................................... M. appendiculata ( Panzer, 1794)

- Median lobe of aedeagus relatively slender, apex gradually narrowed ( Figs 79, 80); elytral outer apical spine generally short, with base broad ( Fig. 67); second metatarsomere equal to or slightly longer than first ( Fig. 71); body relatively small, BL: 5.3–6.6 mm. China (Heilongjiang, Tianjin); Japan; Siberia; Mongolia; Middle Asia; Europe.... M. mutica ( Fabricius, 1792)

5 Pronotum and elytron smooth, without wrinkles ( Figs 56, 60); lateral outline of elytra nearly parallel ( Fig. 52); vertical tubercles distinctly convex ( Figs 54, 55); black stripes on pronotal disc short ( Fig. 56); body relatively small, BL: 3.5–4.5 mm. China (Heilongjiang, Hebei, Jiangsu, Hubei); Japan; East Siberia............................ M. japana ( Jacoby, 1885)

- Pronotum and elytron with wrinkles ( Figs 5, 8); lateral outline of elytra not parallel, widest near middle ( Figs 1, 3); vertical tubercles less convex ( Figs 6, 7); black stripes on pronotal disc long ( Fig. 5); body relatively large, BL: 5.1–6.4 mm. China (Guizhou).......................................................................... M. huaxiensis sp. nov.