Key to the Chrysodema (Chrysodema) antennata species-group

1 Inner side of mesotibia without ridge...................................................................... 2

– Inner side of mesotibia with very distinct ridge (Figs 76, 77). Philippines: Mindanao, Dinagat and Samar islands. Figs 55–57, 59–60, 69, 76, 77.......................................................... C. (C.) variipennis Saunders, 1874

2 Lateral sides of abdominal ventrites II–V coarsely but sparsely macropunctate with smooth and shiny areas; inner side of male mesotibia of C. (C.) sekerkai without long setae, male of C. (C.) holynskii unknown................................. 3

– Lateral sides of abdominal ventrites II–V finely but densely macropunctate without smooth and shiny areas; inner side of male mesotibia densely pubescent with long setae................................................................ 4

3 Basic colour of elytra black; principal impressions of pronotum clearly visible; female mesotibia bent at apical third (Fig. 74). Generally more broad, length/width ratio: ♀♀ (n = 129) 2.51–2.74 (average 2.60). Indonesia: Banggai, Peleng and Sulawesi islands. Figs 38–40, 68, 74........................................................... C. (C.) sekerkai sp. nov.

– Basic colour of elytra green-bronze; principal impressions inconspicuous; female mesotibia not bent at apical third (Fig. 75). Generally more slender, length/width ratio: ♀♀ (n = 37) 2.68–2.89 (average 2.80). Philippines: Masbate Is. Figs 48–50, 53, 75............................................................................. C. (C.) holynskii sp. nov.

4 Male antenna shorter than pronotum...................................................................... 5

– Male antenna longer than pronotum, metallic-coloured apical part of male sternite IX V-shape bordered at base (Fig. 78), penis narrowed at apical half (Figs 70, 71). Philippines: Mindanao Is., Camiguin (Mindanao) Is., Dinagat Is., Leyte Is., Samar Is. Figs 29–34, 70, 71, 78.................................................. C. (C.) antennata antennata Saunders, 1874

5 Metallic-coloured apical part of male sternite IX V-shape bordered at base, parameres shortly narrowly open at apex, (Fig. 67). Generally smaller: ♀♀ (n = 7): length: 22.00–27.25 (average 25.19) mm, width: 8.00–10.25 (average 9.25). Indonesia: Sulawesi Is. Figs 41–43, 46, 67, 73................................... C. (C.) antennata obsoleta J. Thomson, 1878

– Metallic-coloured apical part of male sternite IX arcuately bordered at base (Fig. 79), parameres open from mid-length, penis subparallel-sided (Fig. 72). Generally bigger: ♀♀ (n = 35): length: 24.25–30.00(31.50) (average 27.09) mm, width: 9.00–12.00 (average 10.12) mm. Philippines: Palawan Is. Figs 35–37, 72, 79................. C. (C.) antennata barriesi subsp. nov.