Key to the world species of the subgenus Jaynesia Allen, 1969

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1. T3–T5 with erect, short brown setae intermixed with erect long whitish ones...................................... 2

- T3–T5 with erect long whitish setae only (Fig. 9)........................................................... 5

2. Subposterior groove on T1 with a row of minute punctures.................... T. (J.) ovidorsalis Allen & Jaynes, 1930

- Subposterior groove on T1 without a row of minute punctures................................................. 3

3. Brown setae on T3–T5 dense and visible from any position........................... T. (J.) koreana Rohwer, 1927

- Brown setae on T3–T5 sparse and getting sparser toward lateral margin.......................................... 4

4. Vertex with row of minute punctures obliterated medially..................... T. (J.) antigenata Allen & Jaynes, 1930

- Vertex with complete row of minute punctures.............................. T. (J.) assamensis Allen & Jaynes, 1930

5. S1 with a deep medial fovea............................................... T. (J.) fossata Allen & Jaynes, 1930

- S1 without a deep medial fovea.......................................................................... 6

6. Lateral margin of propodeal areola strongly convergent posteriorly, providing inverted triangular shape; propodeal areola with medial longitudinal carina obscured by irregular punctured, at most reaching posterior 1/2 of areola (Figs 5–6 in Tsuneki 1985).................................................................... T. (J.) autumnalis Rohwer, 1924

- Lateral margin of propodeal areola slightly convergent posteriorly or subparallel, providing rectangular to subtrapezoidal shape; propodeal areola with sharp medial longitudinal carina extending over posterior 1/2 of areola (Fig. 7).................. 7

7. Medial longitudinal carina on propodeal areola sharp, extending nearly to posterior margin of areola........................................................................................... T. (J.) formosensis Tsuneki, 1986a

- Medial longitudinal carina on propodeal areola weakly developed, its apex distincly separated from posterior margin of areola ................................................................................................. 8

8. Surface of propodeal areola medially flat.................................................................. 9

- Surface of propodeal areola strongly arched medially, gradually inclined posteriorly (Fig. 7)........................ 10

9. Frons without medial longitudinal groove..................................... T. (J.) borealis Chen & Yang, 1990

- Frons with one medial longitudinal narrow groove.......................... T. (J.) communis Allen & Jaynes, 1930

10. Lateral margin of clypeus distinctly convex and thickened (Figs 8–9 in Tsuneki 1985)..... T. (J.) oblongata Tsuneki, 1985

- Lateral margin of clypeus flat and not thickened........................................................... 11

11. Pronotal dorsum with sparse punctures (Fig. 17 in Tsuneki 1985).................... T. (J.) levisternalis Tsuneki, 1985

- Pronotal dorsum with dense punctures (Fig. 5)............................................................. 12

12. S1 with lateral groove on posterior half.............................................. T. (J.) punctata Smith, 1873

- S1 without lateral groove on posterior half (Fig. 10).................... T. (J.) hohehotensis Han, Chen & Li, sp. nov.