What is "pipizini"

The Pipizini is a tribe of small to medium-sized generally black hoverflies though some species have orange spots on the abdomen. This nondescript colouring can lead to some species being confused with other dark hoverflies from other tribes. The lack of a facial knob is a good defining feature which separates them from most of these other hoverflies. As with the Syrphinae the larvae feed on aphids though there seems to be a preference for wax-secreting aphids e.g. Pemphigidae.