[4] Conops quadrifasciatus can reach a length of 10–15 millimetres (0.39–0.59 in).These wasp-like conopids have a black head and body.

Face is yellow, but above antennal implant is black, and the area containing the ocelli has the same colour as the eyes.

Females show a slimmer physique and have under the 5th abdominal segment a brownish-yellow, rounded pouch (theca), slightly hooked downward at the apex.

They fly from June to September and feed on nectar and pollen of flowers, mainly of Chamerion angustifolium (Onagraceae), Heracleum sphondylium (Apiaceae), Leucanthemum vulgare, Cirsium arvense, Senecio nemorensis (Asteraceae), Valeriana, and Lamiaceae species.

The females pounce the bumblebees and lay an egg between the tergites by means of the hooked abdomen.