Neodownesia, Gressitt, 1953

Sekerka, Lukáš, 2015, Wallacea, Pistosia and Neodownesia: three distinct genera and their tribal placement (Coleoptera: Chrysomelidae: Cassidinae), Acta Entomologica Musei Nationalis Pragae 55 (2), pp. 713-743 : 719

Key to species of Neodownesia

1 At least elytral intervals II, IV, and VI elevated and forming distinct ribs. Punctures on elytra densely arranged in rows, distance between two punctures much narrower than puncture diameter. .......................................................................................................... 2

– Only interval VI more or less elevated apically. Pronotum sparsely and moderately punctate. Punctures on elytra sparsely arranged in rows, distance between two punctures equal to puncture diameter. Fig. 3 . ............................................... N. sita ( Maulik, 1919)

2 All elytral intervals costate and approximately similarly wide, even slightly higher than odd. Punctation of pronotum moderate, forming regular stripes of dense punctures and five impunctate stripes. Pronotum slighly narrowing anteriorly and with black medial stripe. Ventral surface and legs black. Fig. 1 . ................. N. mediovittata ( Gestro, 1920)

– Only even elytral intervals costate, odd intervals very narrow. Punctation of pronotum coarse and irregular, disc with three more or less defined impunctate stripes. Pronotum widening anteriorly and uniformly yellow. Ventral surface and legs dark brown. Fig. 2 . ..................................................................................................... N. rubra Gressitt, 1953

Figures

Figs 1–7. 1 – Neodownesia mediovittata (Gestro, 1920) (Laos: Ban Song Cha, J, 8.7 mm); 2 – N. rubra Gressitt, 1953 (holotype, J, 6.5 mm); 3 – N. sita (Maulik, 1919) (Thailand: Soppong, ♀, 9.0 mm); 4 – Wallacea apicalis Gestro, 1896 (Indonesia: Mentawai Is.: Siberut, 5.3 mm); 5 – Pistosia terminalis (Baly, 1869) (holotype, 9.5 mm, © Natural History Museum, London); 6 – P. maculata (syntype, 12.0 mm, © Museum für Tierkunde, Berlin); 7 – P. testacea (Fabricius, 1801) (Indonesia: Sulawesi: Ahua Creek, 11.1 mm).