What is "crabronini"

Wasps of the tribe Crabronini 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.