Key to Tricondyla subgenera and species of Philippines

1. Maximal width of aedeagus at the middle, median lobe narrow at basal part (Figs 112–116); endophallus without appendix; base of interocular cavity at same level as neck; without distinct transverse line between neck and occiput............................................................................. 7 (Subgenus Tricondyla (s. str.) Latreille, 1822)

– Maximal width of aedeagus near the base, median lobe strongly inflated immediately after basal orifice (Figs 117–129); endophallus with appendix; base of interocular cavity often higher than neck and with indistinct transverse mark......................................................................... 2 (Subgenus Stenotricondyla Naviaux, 2002)

2(1). Orbital plates and pronotum strongly striated, vertex rugose (Figs 86–88) (refer to comments, probably teratologic specimen)................................................................. T. (Stenotricondyla) genieri Naviaux, 2008

– Orbital plates and pronotum not or shallowly striated......................................................... 3

3(2). Interocular cavity flat and wide; base of the interocular cavity on the same level as the neck; not separated from the neck by transverse impression (Fig. 108)......................................................................... 4

– Interocular cavity convex and narrow; base of the interocular cavity higher than neck; separated from the neck by transverse impression (Figs 109–111).............................................................................. 5

4(3). Elytra shiny, apical half of elytra smooth (Figs 43–49).................. T. (Stenotricondyla) conicicollis Chaudoir, 1844

– Elytra weakly mate, apical part punctate (Figs 66–71)........................ T. (Stenotricondyla) elongata Horn, 1906

5(3). Head between eyes concave (Figs 109, 111)................................................................ 6

– Head between eyes almost flat (Fig. 110); base of the interocular cavity clearly higher than neck; pronotum strongly ampulliform (Figs 96–98)...................................................... T. (Stenotricondyla) planiceps Schaum, 1862

6(5). Apical third of elytra almost smooth (Figs 89–94)................... T. (Stenotricondyla) brunnipes Motschulsky, 1861

– Apical third of elytra clearly punctured (Figs 57–61)................... T. (Stenotricondyla) cyanipes Eschscholtz, 1829

7(1). Pronotum smooth..................................................................................... 8

– Pronotum transversally rugate (Figs 37–39)........................................... T. (s. str.) johnsoni sp. nov.

8(7). Interocular furrows shallow............................................................................. 9

– Interocular furrows moderately deep; apical half of elytra usually with gentle punctures, sometimes barely visible; occasionally apical half almost smooth or clearly punctate (Figs 13–19); body color varies from black to metallic blue or copper, length 15–19 mm ............................................................. T. (s. str.) ovicollis Motschulsky, 1864

9(8). Apical half of elytra gently to moderately punctured, rarely almost smooth; apex of aedeagus strongly down curved (Fig. 112); endophallus (Figs 8–12) with short and thick flagellum........................ T. (s. str.) aptera aptera (Olivier, 1790)

– Apical half of elytra with no trace of punctures, completely smooth, with setiferous pores only, strongly convex; apex of aedeagus moderately down curved (Fig. 116); flagellum long and thin (Figs 33–35)..... T. (s. str.) ventricosa Schaum, 1862