Key to the species-group and species of Carlschoenherria (modified from Itoh 1993) from the Philippines, the Malay Peninsula, Sumatra and Java

1 Parameres compressed laterally, bird-bill shaped at apex ( C. sulcipennis species-group)............................. 2

- Parameres compressed dorsally, developed laterally ( C. hastata species-group).................................... 7

2 Parameres with anterior margin wide, expanded laterally (the C. adoradae species-subgroup)......................... 3

- Parameres with anterior margin narrow, not expanded laterally................................................. 4

3 Anterior margin of parameres explanate, undulate dorsally towards phallobase; pronotum with anterior margin distinctly Vshaped, rounded mesally; anterior angle nearly at 90 0 angle; pronotum with posterior margin entirely nearly straight, minutely concave mesally; anterior margin of clypeus nearly straight dorsally (Figs. 1–4). Philippines ................................................................................................... C. adoradae Calcetas, new species

- Anterior margin of parameres horse saddle-shaped laterally; pronotum with anterior margin concave, nearly straight mesally; anterior angle obtuse; pronotum posterior margin distinctly concave mesally; anterior margin of clypeus slightly concave dor- sally (Figs. 5–8). Philippines ................................................. C. hadsallae Calcetas, new species

4 Pronotum without mesal longitudinal groove or depression (Fig. 16) ( C. borneensis species-subgroup). Philippines ........................................................................................... C. palawana (Moser)

- Pronotum with mesal longitudinal groove or depression (Figs. 21, 25)........................................... 5

5 Abdominal ventrites uniformly covered with pubescence; posterior angle of pronotum rounded, obtuse; prosternal process rectangular-shaped, narrow, elongate, rounded apically (Fig. 15). Philippines, Indonesia ........... C. sulcipennis (Laporte)

- Abdominal ventrites not uniformly covered with pubescence (Fig. 13) ( C. philippinica species-group); posterior angle of pro- notum rounded, nearly at 90 0 angle; prosternal process spindle-shaped, truncate apically, tapered basally................ 6

6 Antennomere III narrowly expanded apically; lamella shorter than anterior margin of clypeus; parameres short; scutellum nar- rowly rounded apically; humeral margin of elytra slightly wedge-shaped towards anterior angle (Figs. 24–28). Philippines .................................................................................. C. philippinica (Brenske)

- Antennomere III widely expanded apically; lamella nearly as long as anterior margin of clypeus; parameres long; scutellum widely rounded apically; humeral margin of elytra distinctly wedge-shaped towards anterior angle (Figs. 9–12). Philippines ........................................................................... C. gapudi Calcetas, new species

7 Ten elytral costae and ten elytral intervals incomplete, interrupted; elytra rugosely punctate, with irregular patch of setae; sides of abdominal ventrites with large patch of setae on abdominal ventrites II and V and with small patch of setae on abdominal ventrites I, III and IV; clypeus with anterior margin distinctly convex dorsally (Figs. 29–31). Malay Peninsula, Sumatra, Java ................................................................................... C. argus (Burmeister)

- Ten elytral costae and ten elytral intervals rows complete, uninterrupted; elytra not rugosely punctate, without patch of setae (Figs. 32, 35); clypeus with anterior margin not distinctly convex dorsally........................................ 8

8 Metaventral process distinctly elongate; pygidium with apical margin finely serrate; sides of abdominal sternites without patch of hairs; apical margin of elytra nearly straight dorsally; clypeus with anterior margin nearly straight dorsally (Figs. 32–34). Malay Peninsula........................................................................ C. hastata (Arrow)

- Metaventral process short; pygidium with apical margin without serration; sides of abdominal sternites with patch of hairs on abdominal sternites II-IV; apical margin of elytra widely rounded dorsally; clypeus with anterior margin slightly convex dor- sally (Fig. 35). Malay Peninsula............................................................. C. vervex (Sharp)