Key to species of Pleurotroppopsis

1 Female ............................................................................................. 2

- Male.............................................................................................. 15

2(1) Mesoscutum covered with dense setae (e.g. Figs 6d, 18a)...................................................... 3

- Mesoscutum with 4 pairs of setae: one pair on MLM, one pair on triangular notaular depressions, and remaining 2 pairs on LLM (one pair on the prominent shoulder of mesoscutum) (e.g. Fig. 10b)............................................. 4

3(2) Upper margin of scrobes deeply incised in the middle (Fig. 18b and figs 5, 6 in Kamijo 1977); lateral ocelli moderate in size (OOL as long as maximum width of lateral ocellus); scape whitish in basal 1/2; fore leg with tarsomeres 1–3 white and tarsomere 4 brown (Fig. 18b); East Asia .................................................. P. tischeriae (Kamijo)

- Upper margin of scrobes shallowly incised in the middle (Fig. 6c); lateral ocelli small (OOL much longer than maximum width of lateral ocellus (5: 3), Fig. 6a); scape entirely blackish (Fig. 6c); fore leg with tarsomeres dark brown with blue tinge (Fig. 6b); Japan .............................................................................. P. hirta (Kamijo)

4(2) Metafemur without teeth along ventral margin (e.g. Fig. 7c).................................................... 5

- Metafemur with teeth along ventral margin (e.g. Fig. 5b)..................................................... 11

5(4) Scutellum with broad foveae (Figs 14a, 15b); Malaysia ................................... P. peukscutella Cao & Zhu

- Scutellum without foveae (e.g. Fig. 2b).................................................................... 6

6(5) Propodeum with about 13 setae on each submedian area (Fig. 11a); Japan ........................... P. lunata (Kamijo)

- Propodeum with submedian areas bare, without setae......................................................... 7

7(6) Metatibia completely and mesotibia mainly whitish (Fig. 10a); frontovertex with distinct raised polygonal reticulation, individual meshes shallow with flat bottom; Sri Lanka ......................................... P. lankensis Kerrich

- All tibiae predominantly or completely dark brown; frontovertex with different sculpture............................ 8

8(7) Frontovertex shiny, with engraved reticulation only vaguely indicated; in anterior view width of upper face up to 0.35× width of head; ocellar triangle distinctly acute, with OOL less than largest width of lateral ocellus (4: 5); Malayan Peninsula........................................................................................... P. nitifrons Bouček

- Frontovertex slightly dull, with very fine engraved reticulation or conspicuous piliferous punctation; in anterior view width of upper face relatively greater than in alternate, more than 0.4× width of head; ocellar triangle right-angled or slightly obtuse, with OOL at least as long as largest diameter of lateral ocellus.................................................. 9

9(8) MLM with a distinct median groove in at least posterior 2/3 (Figs 16a, 16b); scape brown with ventral area paler in basal 1/3 (Fig. 16d); pronotal collar with dense setae (Fig. 16b) compared to alternate; dorsellum sculptured; gaster stout and distinctly piliferous-punctate (Figs 16d, 16e); East Africa and Madagascar ................................... P. pilosa (Risbec)

- MLM with a reduced median groove, indicated posteriorly only (e.g. Fig. 8b); scape whitish with brown apex; pronotal collar with less dense setae compared to alternate; dorsellum smooth; gaster slender and less piliferous-punctate than in alternate (e.g. Fig. 7a)............................................................................................ 10

10(9) Scutellum with nearly uniform engraved reticulation, without distinct transverse striation (Fig. 8b); MLM faintly sculptured and smooth only along posterior margin (Fig. 8b); lateral margin of dorsellum straight (Fig. 8b); Asia.. P. japonica (Kamijo)

- Scutellum with transverse engraved striation in middle 1/3; MLM with a distinct smooth apex (Fig. 12c); lateral margin of dorsellum rounded (Fig. 12a); Australia ................................................. P. maculatipennis Girault

11(4) MLM with a median groove posteriorly (e.g. Fig. 17b), though sometimes irregular and ill-defined (Fig. 11a)........... 12

- MLM without any trace of a median groove (e.g. Fig. 4b).................................................... 13

12(11) Frontovertex with a median groove extending from anterior ocellus to straight frontal carina (Fig. 3c); posterior 1/2 of MLM with a narrow median groove that is narrower than 1/2 the width of a notaular depression (Fig. 2b); scutellum with sublateral grooves narrow because of small punctures (Fig. 2b) and row of punctures outside sublateral grooves distinct (Fig. 2b); China ................................................................................ P. dactylispae Cao & Zhu

- Frontovertex without a median groove and face with frontal carina sinuate; posterior 1/2 of MLM with a broad median depression that is wider than 1/2 the width of a notaular depression (Fig. 17b); scutellum with sublateral grooves broad because of broad punctures and row of punctures outside sublateral grooves indistinct (Fig. 17b); Africa.... P. podagrica (Waterston)

13(11) Scutellum with numerous setae (Fig. 5a), and without sublateral grooves and transverse posterior groove (Fig. 5a); India ............................................................................ P. femorata (Surekha & Narendran)

- Scutellum with one pair of setae (e.g. Fig. 9b), and with sublateral grooves and transverse posterior groove (e.g. Fig. 9b).. 14

14(13) Face between frontal carina and toruli distinctly depressed; Gt 6 with a horn at each posterolateral corner (Figs 4a, 4b); South Asia...................................................................... P. dentata (Surekha & Narendran)

- Face between frontal carina and toruli not depressed; posterior margin of Gt 6 straight, without horns posterolaterally (Fig. 9a); Indonesia ............................................................................... P. javana Bouček

15(2) Mesoscutum covered with dense setae (Fig. 18f); Japan ...................................... P. tischeriae (Kamijo)

- Mesoscutum with 4 pairs of setae: one pair on mid lobe, one pair on triangular notaular depressions, and remaining 2 pairs on LLM (one pair on the prominent shoulder of mesoscutum) (e.g. Fig. 2j)......................................... 16

16(15) Metafemur with teeth along ventral margin (e.g. Fig. 3f)..................................................... 17

- Metafemur without teeth along ventral margin............................................................. 19

17(16) Mesoscutum with a median groove posteriorly (e.g. Figs 2h, 17d); scutellum with one pair of setae................... 18

- Mesoscutum without any trace of a median groove; scutellum with numerous setae; India. P. femorata (Surekha & Narendran)

18(17) Legs with tibiae white, in contrast to metallic coxae (Fig. 3f); China .......................... P. dactylispae Cao & Zhu

- Legs with tibiae dark brown (Fig. 17e); Africa........................................... P. podagrica (Waterston)

19(16) Propodeum with one seta on each submedian area; Japan ........................................ P. lunata (Kamijo)

- Propodeum without setae on submedian areas.............................................................. 20

20(19) Scutellum with broad foveae (Fig. 15g); Malaysia ....................................... P. peukscutella Cao & Zhu

- Scutellum without foveae (e.g. Fig. 2h)................................................................... 21

21(20) Axilla with numerous setae; tibiae dark brown; fore wing infuscate below MV; scutellum with distinct engraved reticulation and a distinct groove posteriorly; East Africa and Madagascar ..................................... P. pilosa (Risbec)

- Axilla with one seta; tibiae whitish to pale brown; fore wing hyaline; scutellum with weak engraved reticulation, and without posterior groove..................................................................................... 22

22(21) MLM with a reduced median groove that is distinct in posterior 1/5 (Fig. 7f); metatibia dark brown; Asia................................................................................................... P. japonica (Kamijo)

- MLM with a distinct narrow median groove in posterior 2/3; metatibia entirely whitish; Sri Lanka ...... P. lankensis Kerrich