Key to the species of Oedosphenella Frey

1 Scutellum strongly convex and shiny. Wing pattern: apical band connected anteriorly to pre-apical band................. 2

- Scutellum slightly convex, not shiny, dull. Wing pattern: apical band isolated...................................... 3

2 Wing pattern: apical band entire, without hyaline indentation at posterior end (Fig. 1D). Abdomen black, at most posterior edge of tergites 4–6 narrowly grey. Canary Islands............................................ O. canariensis (Macquart)

- Wing pattern: apical band with a hyaline indentation at posterior end, reaching into cell r 4+5 (Fig. 1A). Abdomen yellow-brown, all tergites with ill-defined pair of brown spots of variable size, posterior edges of tergites grey. South Africa .................................................................................................. O. auriella (Munro)

3 Wing pattern: apical band entire, without hyaline indentation at posterior end (Fig. 1C). Scutellum dark brown, concolorous with scutum. Abdomen entirely black in male, female has the posterior edge of tergites narrowly grey-brown. Madeira ................................................................................................ O. bob sp. n.

- Wing pattern: apical band with a hyaline indentation at posterior end, reaching into cell r 4+5 (Fig. 1B). Scutellum yellow, clearly contrasting with scutum. Abdomen black, posterior edge of tergites narrowly yellow. Lesotho ........... O. basuto (Munro)