Key to species of the genus Mycetobia Meigen, 1818 from Eocene

1. Flagellomeres 8–13 elongated, 2x or more longer than wide; Sc ending distally of Rs bifurcation level; R 1 apex distally of M 1+2 bifurcation level; fork of M 1+2 narrow, M 1+2 short, approximately half the length of M 1, last palpomeres approximately 8x as long as wide............................................................................. M. silvia sp. nov.

- Flagellomeres 8–13 up to 2x as long as wide; Sc ending proximally of or opposite Rs bifurcation level; R 1 apex proximally of M 1+2 bifurcation level; fork of M 1+2 wide, M 1+2 elongated, longer than half the length of M 1, last palpomeres at most 3x as long as wide............................................................................................. 2.

2. R 2+3 three times as long as Rs or longer; last palpomere rounded at apex.......................... M. christelae sp. nov.

- R 2+3 two and half times as long as Rs or shorter; last palpomere thinned at apex.................................... 3.

3. M 1+2 shorter than M 1; tarsus of fore leg distinctly shorter than 0.3 the length of entire leg including coxa......................................................................................................... M. hansi sp. nov.

- M 1+2 as long as M 1 or longer; tarsus of fore leg 0.3 the length of entire leg including coxa or longer.................... 4.

4. The distance between M 2 and M 3+4 apices approximately twice longer the distance between M 1 and M 2 apices............................................................................................. M. connexa Meunier, 1899 - The distance between M 2 and M 3+4 apices at most 1.5x than the distance between M 1 and M 2 apices.................... 5.

5. Sc ending before Rs bifurcation level; the distance between M 1 and M 2 apices equal the distance between R 4+5 and M 1 apices; R 2+3 ending before bifurcation of M 1+2 level; R 2+3 ending before half the length R 4+5 level; thorax with sparse and not very thick setae; the distance between R 1 and R 2+3 apices approximately 3x as long as the distance between Sc and R 1 apices.............................................................................................. M. perkovskyi sp. nov.

- Sc ending opposite Rs bifurcation level; the distance between M 1 and M 2 apices shorter the distance between R 4+5 and M 1 apices; R 2+3 ending beyond bifurcation of M 1+2 level; R 2+3 ending beyond half the length R 4+5 level; very elongated, thick and dense setae on thorax; the distance between R 1 and R 2+3 apices approximately 5x as long as the distance between Sc and R 1 apices....................................................................................... M. szwedoi sp. nov.