Key to Dactuliothrips species

1. Antennae dark, except pedicel of segment III pale (Fig. 14).................................................... 2

- Antennae not uniformly dark, segment III pale (Figs 12, 13, 15–18).............................................. 4

2. Spurs on inner margin of fore femur, when present, long and slender, usually 2–5 in number; metanotum with two pairs of setae (Fig. 37)..................................................................... .. diversus Bailey (USA)

- Spurs on inner margin of fore femur short broad, 3–9 in number; metanotum with one pair of setae (Figs 38–43).......... 3

3. Fore tibia on inner side with two large and distinct claws bearing short setae (Fig. 75); outer postocular setae shorter than dis- tance between bases of eyes (Fig. 24)................................................... malloi Tapia (Argentina)

- Fore tibia on inner side without claws; outer postocular setae longer than distance between bases of eyes.................................................................................................... boharti Bailey (USA)

4. Pronotum with about 3 pairs of well-developed discal setae (Fig. 36).......................... xerophilus Bailey (USA)

- Pronotum with 5–7 pairs of discal setae (Figs 29–35)......................................................... 5

5. Antennal segments III & IV each with one elongate sensorium (Figs 19–20)...................... ephedra sp.n. (USA)

- Antennal segments III & IV with oval-to-circular sensorium.................................................... 6

6. Fore wing completely shaded light brown; antennal segment III equal to or shorter than segment IV (Fig. 17).............................................................................................. spinosus Moulton (USA)

- Fore wing light brown but pale at base (Figs 78–79, 81); antennal segment III longer than segment IV (Figs 15, 16)....... 7

7. Head with microtrichia (Figs 22–23); antennal segment III (and sometimes base of IV) pale (Fig. 13); male abdominal tergite I with paired longitudinal ridges not reaching anterior margin (Fig. 56)..................... kasazabi Pelikán (Argentina)

- Head without microtrichia (Figs 25–26); antennal segment III & IV pale (Fig. 15); male abdominal tergite I with paired longi- tudinal ridges reaching anterior margin (Figs 57–58).......................................................... 8

8. Mesonotum and metanotum with microtrichia (Fig. 40); inner apex of fore tibia in males with a claw bearing short setae (Fig. 74)............................................................................. monttea sp.n. (Argentina)

- Mesonotum and metanotum without microtrichia (Fig. 41); inner apex of fore tibia in males without such claws (Fig. 67).................................................................................... prosopis sp.n. (Argentina)