Key to species of Neohydatothrips from China

1. Antenna 7 segmented.................................................................................. 2

-. Antenna 8 segmented.................................................................................. 3

2. At least certain antecostal ridges on abdominal tergites II–VII pale or absent [Taiwan, India, Indonesia, Australia]................................................................................................ plynopygus Karny

-. All antecostal ridges on abdominal tergites II–VII dark [Sichuan]........................... xestosternitus Han and Cui

3. Posterior margins of abdominal tergites with craspedum [Ningxia and Nei Mongol, widespread from Europe to Japan]......................................................................................... gracilicornis Williams

-. Posterior margins of abdominal tergites without craspedum.................................................... 4

4. Pronotal blotch weakly sclerotized; abdomen yellow, tergites II–VI with brown areas posterior antecostal ridge laterally [Tai- wan, Mexico, Hawaii, India, Thailand, Australia]................................................ gracilipes Hood

-. Pronotal blotch well sclerotized; abdomen entirely brown or with paler and darker tergites............................ 5

5. Fore wing second vein with at least 1 seta.................................................................. 6

-. Fore wing second vein without setae...................................................................... 9

6. Mid and hind tibiae brown.............................................................................. 7

-. Mid and hind tibiae yellow.............................................................................. 8

7. Fore wing second vein with 2 setae [Taiwan]...................................................... medius Wang

-. Fore wing second vein with only 1 seta [Changchun].......................................... epipactis Kurosawa

8. Abdominal tergite VI paler than other tergites [Taiwan]............................................ surrufus Wang

-. Abdominal tergites VI not paler than other tergites [Sichuan]........................................ elaeagni Kudô

9. Occipital apodeme touching posterior margin of eyes [Taiwan]..................................... tabulifer Priesner

-. Occipital apodeme not touching posterior margin of eyes (Fig. 3)............................................... 10

10. Body bicolored yellow and brown....................................................................... 11

-. Body pale yellowish, laterals of abdominal tergites II–III and tergite VIII grayish shaded [Hainan].......... trypherus Han

11. Posterior margin of blotch straight (Fig. 5); fore wing dark with base paler [Yunnan]................... magnoliae sp. n.

-. Posterior margin of blotch deeply concave medially; fore wing with transverse bands............................... 12

12. Fore wing with three dark bands; antennal segment I brown [Taiwan, widespread around world]......... samayunkur Kudô

-. Fore wing with two dark bands; antennal segment I yellowish [Ningxia and Nei Mongol]............... tadzhicus Pelikan