Phlaeothripidae, Uzel, 1895

Key to genera and species of Phlaeothripidae View in CoL from Saudi Arabia

1. Maxillary palpi 2-segmented; maxillary stylets broad (5–10 µm); setae S2 on tergite IX as long as S1 and S3; antennal segments III–IV each with 2 sense cones (rarely one on segment III)[No specimens examined]....................... Heptathrips View in CoL

-. Maxillary palpi 3-segmented; maxillary stylets not broad (2–3 µm, rarely 3–6 µm); setae S2 on tergite IX smaller than S1 and S3; sense cones on antennal segments III–IV various......................................................... 2

2. Abdominal segments III–VI without wing-retaining setae ( Fig. 21 View FIGURES 20–27 ); antennal segment IV with 1–2 sense cones ( Figs 5–6 View FIGURES 2–11 ); apterous species……………………….................................................................... 3

-. Abdominal segments III–VI with at least one pair of wing-retaining setae ( Figs 20, 22–23 View FIGURES 20–27 ); antennal segment IV with at least three sense cones ( Figs 2–4, 7–11 View FIGURES 2–11 ); wings usually present..................................................... 4

3. Antennae 7-segmented; segment III without sense cones, IV with only one; segments VI–VII broadly joined, VII not pedicilate at base ( Fig. 6 View FIGURES 2–11 ); maxillary bridge absent; major setae reduced and broad ( Fig. 21 View FIGURES 20–27 ); body sculptured............ Idiothrips View in CoL

-. Antennae 8-segmented; segment III with one cone, IV with two; segments VI–VII, not broadly joined, VII pedicilate ( Fig. 5 View FIGURES 2–11 ); maxillary bridge present; major setae developed but not broad...................................... Apterygothrips View in CoL

4. Antennal segment III slender, 4–5 times as long as wide ( Figs 2–4 View FIGURES 2–11 ); head elongate ( Figs 12–17 View FIGURES 12–19 )...................... 5

-. Antennal segment III short, 1.2–2 times as long as wide ( Figs 10–11 View FIGURES 2–11 ); head not elongate ( Fig. 38 View FIGURES 38–44 )..................... 8

5. Tube elongate, more than 6 times as long as basal width ( Fig. 26 View FIGURES 20–27 ); basantra absent; large species, body length more than 5000 microns ( Figs 35 View FIGURES 35–37 , 49 View FIGURES 47–50 )........................................................................ Gigantothrips View in CoL

-. Tube about 2.1 times as long as basal width ( Figs 24–25 View FIGURES 20–27 ); basantra present ( Fig. 14 View FIGURES 12–19 ) or absent ( Fig. 17 View FIGURES 12–19 ); medium sized species, maximum body length 3400 microns ( Figs 47–48 View FIGURES 47–50 ).......................................................... 6

6. Mouth cone short, not reaching fore coxae ( Fig. 16 View FIGURES 12–19 ); basantra absent ( Fig. 17 View FIGURES 12–19 ); metanotum with medium to compact cells of reticulation; segment IX with SI setae shorter than tube ( Fig. 27 View FIGURES 20–27 )......................................... Liothrips View in CoL

-. Mouth cone pointed and extending between the fore coxae ( Fig. 12–14 View FIGURES 12–19 ); basantra present ( Fig. 14 View FIGURES 12–19 ); metanotum with longitudinal striation ( Figs 18–19 View FIGURES 12–19 ); segment IX with SI setae longer than tube ( Figs 24–25 View FIGURES 20–27 ).................................... 7

7. Abdominal tergites with two pairs of wing-retaining setae, sometimes with accessory wing-retaining setae; apex of antennal segments IV–VI or VII symmetrical ( Fig. 4 View FIGURES 2–11 ), segment III with three well developed sense cones ( Fig. 4 View FIGURES 2–11 ); metanotum with few longitudinal striae ( Fig. 19 View FIGURES 12–19 ); hind margin of fore wing with duplicated setae............................. Dolichothrips View in CoL

-. Abdominal tergites with more than two pairs of wing-retaining setae ( Fig. 20 View FIGURES 20–27 ); apex of antennal segments IV–VI or VII strongly asymmetrical ( Fig. 3 View FIGURES 2–11 ), segment III with one well developed sense cone ( Fig. 3 View FIGURES 2–11 ); metanotum very closely striate ( Fig. 18 View FIGURES 12–19 ); hind margin of fore wing without duplicated setae...................................................... Dolicholepta View in CoL

8. External apical margin of fore femora recurved, with a small tooth-like projection; fore legs stout ( Fig. 51 View FIGURES 51–59 ).... Chiraplothrips View in CoL

-. External apical margin of fore femora not recurved, without tooth; fore legs normal................................. 9

9. Abdominal segments III–VI with one pair of wing-retaining setae well-developed, rarely two ( Fig. 29 View FIGURES 28–34 ); fore wings weakly constricted medially........................................................................... Plicothrips View in CoL

-. Abdominal segments III–VI always with two pairs of wing-retaining setae well-developed ( Fig. 28 View FIGURES 28–34 ); fore wings clearly constricted medially.......................................................................... Haplothrips View in CoL