Crabronini  Crabronini is a tribe of square-headed wasps in the family Crabronidae. There are more than 40 genera and 1,500 described species in Crabronini. Wasps of this tribe are mostly small to very small wasps. Typical of this tribe are the forewings with a single submarginal cell, the lack of membranous metanotal and propodeal modifications, and (in most genera) a square-shaped head. Typical Crabronini prey upon flies and make simple nests, either in the ground or in rotting logs. These 48 genera belong to the tribe Crabronini: