Key to species of the tropical Old World species of Discomyza

1. Thorax with whitish pattern of microtomentum (Fig. 59).............................. D. maculipennis (Wiedemann)

- Thorax uniformly black, without pattern of microtomentum (Fig. 46)........................................... 2

2. Foreleg, including basitarsus, completely dark.............................................................. 3

- Basitarsus of foreleg whitish........................................................................... 4

3. Antenna dark (Fig. 60, 61).................................................................. D. similis Lamb

- Antenna yellowish (Fig. 25, 26)............................................................ D. eritrea Cresson

4. Length of basoflagellomere less than 2x of its width (Fig. 3, 4).................................. D. africana Cresson

- Length of basoflagellomere about 3X or more its width (Fig. 13, 35)............................................ 5

5. Antenna with basoflagellomere darkened on apical half (Fig. 13). Wing with narrow dark spot around crossvein dm-m and sep- arated from the rest of infuscation (Fig. 23).............................................. D. dolichocerus Cresson

- Antenna with red basoflagellomere (Fig. 35). Wing with wide dark spot around crossvein dm-m and connected with the rest of infuscation (Fig. 45).................................................................. D. fagomoga sp. nov.