Chrysosoma, Guerin-Meneville, 1831

Zhu, Yajun & Yang, Ding, 2005, New species of Chrysosoma Guérin-Méneville (Diptera: Dolichopodidae), with a key to Chinese species, Zootaxa 1029 (1), pp. 47-60 : 48-50

Key to species (males) of Chrysosoma from China

1. Wing with dark brown maculation, continuous along anterior margin, with excavation from posterior margin.................................................................................................... 2

­ Wing hyaline or with subapical spot or clouding near costa......................................... 5

2. Antenna black or brownish black.................................................................................. 3

­ Antenna yellow; cercus widely furcate ............................ Chrysosoma cupido (Walker)

3. CI yellow ....................................................................................................................... 4

­ All coxae black; cercus widely furcate ............ Chrysosoma dalianum Yang et Saigusa

4. Crossvein m­cu straight… ................................................ Chrysosoma chinense Becker

­ Crossvein m­cu strongly bent; cercus long and finger­like............................................. ........................................................................... Chrysosoma serratum Yang et Saigusa

5. Flagellum and arista separated ...................................................................................... 6

­ Flagellum and arista fused; cercus with digitiform dorsal projection and bilobed ventral arm ................................................................ Chrysosoma crinicorne (Wiedemann)

6. TIII with an excavated swollen callus at base............................................................... 7

­ TIII tibia without swollen callus ................................................................................... 8

7. Arista with apical flag; IIt 4­5 normal; cercus slender with 2 dorsal projections at base and 1 sub­apically .............................................. Chrysosoma globiferum (Wiedemann)

­ Arista simple; IIt 4­5 flattened with white hairs; cercus furcated apically......................... ........................................................................... Chrysosoma leucopogon (Wiedemann)

8. Arista with apical flag ................................................................................................... 9

­ Arista simple… ........................................................................................................... 11

9. Antenna black….......................................................................................................... 10

­ Antenna yellow; cercus widely furcated, ventral lobe also furcated apically ................. ......................................................................................... Chrysosoma piriforme Becker

10. CI yellow; cercus slender .................................................. Chrysosoma hainanum Yang

­ CI blackish; cercus short and furcated ( Fig. 10 ) ... Chrysosoma zengchengense sp. nov.

11. CI black ....................................................................................................................... 12

­ CI yellow .....................................................................................................................18

12. Abdomen without dense cream­clouded hairs ventrally ............................................. 13

­ Abdomen with dense cream­clouded hairs ventrally; cercus widely furcated, ventral lobe apically trifurcated .................................................. Chrysosoma floccosum Becker

13. Femora yellow............................................................................................................. 14

­ Femora chiefly black................................................................................................... 17

14. Palpus black or blackish… .......................................................................................... 15

­ Palpus yellowish; cercus furcated apically Chrysosoma cyaneculiscutum Bickel et Wei

15. Arista nearly as long as head + thorax… .................................................................... 16

­ Arista much longer than head + thorax; cercus furcated apically ( Fig. 3 )...................... ................................................................................... Chrysosoma nanlingense sp. nov.

16. FI with long pale ventral hairs on basal half; cercus subrectangular, long and rather thick ............................................................................ Chrysosoma crassum Yang et Saigusa

­ FI with short pale ventral hairs on basal half; cercus apically furcated into several finger­like processes ...................... Chrysosoma guangdongense Zhang, Yang et Grootaet

17. Arista nearly as long as head + thorax; cercus without dorsal projection ( Fig. 7 ).......... .................................................................................... Chrysosoma shixingense sp. nov.

­ Arista much longer than head + thorax; cercus with short digitiform dorsal projection ....................................................................................... Chrysosoma guizhouense Yang

18. It 1 somewhat thick with plumose lateral hairs............................................................. 19

­ It 1 normal..................................................................................................................... 20

19. Thorax mainly dark yellow; cercus slender Chrysosoma jinpinganum Yang et Saigusa

­ Thorax mainly metallic green; cercus long and furcated apically ( Fig. 5 ) ..................... .................................................................................... Chrysosoma ruyuanense sp. nov.

20. Arista longer than head + thorax ................................................................................. 21

­ Arista shorter than head + thorax ................................................................................ 24

21. CII yellow.................................................................................................................... 22

­ CII black; cercus with short digitiform dorsal projection and long bilobed clavate ventral arm ....................................................................... Chrysosoma hangzhouense Yang

22. Thorax mainly metallic green ..................................................................................... 23

­ Thorax mainly yellow; cercus long and finger­like ........................................................ .................................................................................. Chrysosoma xanthodes Yang et Li

23. CIII yellow; surstylus with 3 ventral processes .............................................................. ....................................................................... Chrysosoma yunnanense Yang et Saigusa

­ CIII black; surstylus with apical denticles ... Chrysosoma pallipilosum Yang et Saigusa

24. All coxa yellow; cercus subtriangular .......... Chrysosoma luchunanum Yang et Saigusa

­ CI yellow, CII and CIII black; cercus long with thin and curved apex ........................... .......................................................................................... Chrysosoma insensibile Yang

Figures

FIGURES 8–10. Chrysosoma zengchengense sp. nov. (Male). 8. Antennal flag, lateral view; 9. left It1, right lateral view; 10. genitalia, lateral view.

FIGURES 1–3. Chrysosoma nanlingense sp. nov. (Male). 1. Left It1, right lateral view; 2. left It2­5, right lateral view; 3. genitalia, lateral view.

FIGURES 6–7. Chrysosoma shixingense sp. nov. (Male). 6. Left It1, right lateral view; 7. genitalia, lateral view.

FIGURES 4–5. Chrysosoma ruyuanense sp. nov. (Male). 4. Left It1, ventral view; 5. genitalia, lateral view.