Black body
Round, purplish or dark green eyes. Interocular space with parallel or convergent sides. Antennae sockets superficial. Ocellar bristles usually shorter than the posterior vertical bristles. Short antennae, well separated at the base. Black body, more or less bright or chagrined, sometimes with coppery reflections. Humeral present or not (casei). Glassy wings, without an apical brown spot: often with pale veins. The abdomen is short, oval or square.