Key to species of the cavus species complex

1 Eyes smaller, eye height equal to or less than 2.0x POL. Head and mesosoma black, without metallic gloss or with only slight tinges of bronze, brown or green........................................... D. verovesparum Peters & Baur sp. n.

- Eyes larger, eye height more than 2.0x POL. Head and body usually with distinct metallic green, blue or bronze gloss, especially in males........................................................................................ 2

2 Females ............................................................................................. 3

- Males............................................................................................... 4

3 Usually, gaster length equal to or less than 4.05x eye breadth and head breadth equal to or less than 4.73x stigmal vein; mesoscutum without blue color........................................................... D. lignicola Graham

- Usually, gaster length more than 4.05x eye breadth or head breadth more than 4.73x stigmal vein; mesoscutum sometimes with tinge of or distinct blue color........................................................... D. microgastri Bouché

4 Outer side of apex of scape and pedicel with distinct lobe (Fig. 9 e); gaster with distinct ventral testaceous spot (Fig. 9b)......................................................................................... D. lignicola Graham

- Outer side of scape and pedicel without a lobe (Fig. 9 d); gaster with ventral testaceous spot absent to distinct................................................................................................. D. microgastri Bouché