Key to world species of genus Chromatopterum Becker

(modified from Deeming 1981)

1. Wing hyaline with a fuscous costal band ending in an apical spot (Figs 1, 2, 10, 11)................................. 2

- Wing fuscous with small hyaline areas towards its base........................................................7

2. Scutum black or brown with black stripes.................................................................. 3

- Scutum yellow with black stripes.........................................................................6

3. Scutum entirely black; halter entirely black or only knob of halter ivory white.....................................4

- Scutum brown with black stripes almost indistinct; halter entirely pale yellow......................................5

4. Scutellum entirely black; knob of halter ivory white.—Afrotropical (Kenya, Ruanda, Zair)..... .. C. delicatum Becker, 1910

- Scutellum black except for dark yellow centrally on disc and apically; halter entirely black.—Afrotropical (Nigeria).................................................................................... C. dimidiatum Deeming, 1981

5. Femora yellow except for middle 1/2 of fore femur brown; apical spot of wing separated by a narrow space from apex of costal band in marginal cell.—Oriental (China: Hainan, Yunnan)................................. .. C. brevicercum sp. nov.

- Femora brown except for distal portions yellow; apical spot of wing separated by a wide space from apex of costal band in marginal cell.—Oriental (China: Yunnan).............................................. C. longiclavatum sp. nov.

6. Ocellar triangle yellow except for anterior portion reddish with a black ocellar spot; scutellum entirely yellow.—New Guinea (PNG)......................................................................... C. pubescens Becker, 1911

- Ocellar triangle black except for posterolateral sides narrowly yellow; scutellum blackish brown except for brownish yellow posterodorsally.—Oriental (Borneo Sabah, Java, Krakatau).................. C. nusantarum Kanmiya et Yukawa, 1985

7. Scutellum black.—Afrotropical (Ghana)........................................... C. ghanaensis Deeming, 1981

- Scutellum largely yellow or ivory white....................................................................8

8. Face ivory white; scutellum conical.—Afrotropical (Nigeria)............................ .. C. mirabilis Deeming, 1981

- Face dark; scutellum short and convex on disc...............................................................9

9. Fore coxa bright yellow.—Afrotropical (Uganda, Cameroun)............................ C. suffusum Sabrosky, 1951

- Fore coxa black.—Afrotropical (Ivory Coast, Nigeria)................................... C. linguatum Séguy, 1957