Following the description of A. minima, the key to the females of the Afrotropical species of Ampulicomorpha published by Guglielmino & Olmi (2014) should be modified as follows:

1 Forewing hyaline, not darkened (Figs 1E, 5)............................................................... 2

- Forewing completely darkened (Figs 2–4, 6)................................................................ 3

2 Body dark brown (Fig. 5); head pear-shaped (Fig. 5A), eye situated laterally in front of ocellar triangle (Fig. 5C); antenna shorter than body length (Fig. 5A)............................................................ A. magna Olmi

- Body yellow-whitish (Fig. 1); head subspheroidal (Figs 1A, C), eye situated laterally on sides of ocellar triangle (Figs 1A, C); antenna longer than body length (Fig. 1A).................................................... A. minima sp. nov.

3 Median longitudinal furrow of pronotum incomplete, very short, close to posterior margin of pronotum (Fig. 3D)...................................................................................... A. irwini Guglielmino & Olmi

- Median longitudinal furrow of pronotum complete or reaching almost mid length of pronotum (Figs 2C, 4C, 6C)......... 4

4 Metapectal-propodeal disc with two longitudinal keels forming large and distinct basal areola (Figs 4A, D).................................................................................................. A. madecassa Olmi

- Metapectal-propodeal disc with two longitudinal keels not forming basal areola (Figs 2A, C, 6A, C), occasionally disc with two traces of longitudinal keels.............................................................................. 5

5 Metapectal-propodeal disc strongly reticulate rugose (Fig. 2C).................................... A. forestalis Olmi

- Metapectal-propodeal disc less rugose, mainly on lateral surfaces (Fig. 6C)....................... A. nzigidaherai Olmi