Alysson, Panzer, 1806

Key to Alysson View in CoL of China

1. Thorax more or less reddish brown or with yellow spot; free margin of clypeus with one or three denticles.............. 2

- Thorax wholly black, without reddish brown portion or yellow spot; free margin of clypeus with or without one or three denticles............................................................................................ 5

2. Pronotal collar with pair of yellow spots, free margin of clypeus with one denticle........ Alysson spinosus (Panzer), 1801 View in CoL

- Pronotal collar without yellow spot, free margin of clypeus with three denticles................................... 3

3. Prothorax and propodeum with bluish or violet metallic lustre; scutellum with yellow spot, clypeus yellow............................................................................... Alysson pertheesi formosanus Tsuneki, 1968 View in CoL

- Prothorax and propodeum without bluish or violet metallic lustre; scutellum reddish brown or with yellow spot, clypeus light yellow or reddish brown............................................................................... 4

4. Flagellomere I longer than II; scutellum wholly reddish brown; clypeus light yellow; basal half of gastral tergum I reddish brown.............................................................. Alysson yunnanensis Wu and Zhou, 1987 View in CoL

- Flagellomere I shorter than II; scutellum black, with yellow spot; clypeus reddish brown; gastral tergum I wholly and basal portion of tergum II reddish brown............................................... Alysson pertheesi Gorski, 1852 View in CoL

5. Propodeal enclosure with apex rounded; free margin of clypeus with one or three denticles; clypeus wholly or partly yellow. ................................................................................................... 6

- Propodeal enclosure sharply pointed at apex; free margin of clypeus with or without one or three denticles; clypeus black or wholly or partly yellow................................................................................ 8

6. Free margin of clypeus with three denticles; second recurrent vein received by junction of submarginal cell I and II; propodeal enclosure with about 16 oblique longitudinal rugae................................. Alysson verhoeffi Tsuneki, 1967 View in CoL

- Free margin of clypeus with one denticle; second recurrent vein received by submarginal cell II; propodeal enclosure with less than 10 oblique longitudinal rugae....................................................................... 7

7. Propodeal enclosure equal to about half length of propodeal dorsum, with two irregular oblique longitudinal rugae............................................................................ Alysson attenuatu s Wu and Zhou, 1987

- Propodeal enclosure as long as propodeum dorsally, with about 10 oblique longitudinal rugae.................................................................................................... Alysson taiwanus Sonan, 1940 View in CoL

8. Free margin of clypeus with one or three denticles; flagellomere I longer or shorter than II; clypeus wholly or partly yellow. ................................................................................................... 9

- Free margin of clypeus without denticles; flagellomere I shorter than II; clypeus black or wholly or partly yellow....... 11

9. Free margin of clypeus with one denticle; flagellomere I longer than II; second recurrent vein received by submarginal cell III.......................................................................... Alysson takasago Tsuneki, 1977 View in CoL

- Free margin of clypeus with three denticles; flagellomere I shorter than II; second recurrent vein received by submarginal cell II or III............................................................................................ 10

10. Second recurrent vein received by submarginal cell II; clypeus largely yellow, black mesally and apically.................................................................................. Alysson sichuanensis Wu and Zhou, 1987 View in CoL

- Second recurrent vein received by submarginal cell III; clypeus wholly yellow..... Alysson tridentatus Wu and Zhou, 1987 View in CoL

11. Thorax with blue metallic luster; clypeus yellow........................................................... 12

- Thorax without blue metallic luster; clypeus black or yellow................................................. 13

12. Thorax wholly with blue metallic luster; propodeal enclosure about as long as 5/6 of propodeal dorsum, with about six oblique longitudinal rugae; gastral tergum II without yellowish spot in male............... Alysson caeruleus Wu and Zhou, 1987 View in CoL

- Only pronotum and propodeum with blue metallic luster; propodeal enclosure as long as propodeal dorsum, with about 16 oblique longitudinal rugae; gastral tergum II with pair of round yellowish spots in male............................................................................................ Alysson cyanotaeniatus Zou and Chen , sp. nov.

13. Propodeal enclosure with about 4 oblique longitudinal rugae; second recurrent vein received by submarginal cell II............................................................................. Alysson carinatus Wu and Zhou, 1987 View in CoL

- Propodeal enclosure with more than eight oblique longitudinal rugae; second recurrent vein received by submarginal cell III. .................................................................................................. 14

14. Clypeus black, its middle portion flattened; legs black, except lower portion of fore and mid legs brown..................................................................................... Alysson nigrilabius Wu and Zhou, 1987 View in CoL

- Clypeus yellow or free margin yellowish brown, its middle portion slightly bulging; legs yellow or brown, except basal portion of coxae black...................................................................................... 15

15. Free margin of labrum straight medially; length of propodeal enclosure equal to about 4/5 of propodeal dorsum; long spot on lower frons laterally yellow.................................................. Alysson ratzeburgi Dahlbom, 1843 View in CoL

- Free margin of labrum with broad and deep depression medially; propodeal enclosure as long as propodeal dorsum; long spot on lower frons laterally light gray white................................... Alysson labrisectus Zou and Li , sp. nov.