See text Pison is a cosmopolitan genus of wasps within the family Crabronidae.

[2] This distribution pattern has been thought to indicate that the genus was once much larger, and has declined in the face of competition with more competitive wasp genera, leaving the genus largely concentrated in geographically-isolated regions.

Several species, including P. argentatum and P. iridipenne are of uncertain native distribution, having been dispersed by humans in antiquity.

[3][2] Pison wasps raise their young on a diet of living, but paralysed, spiders.

Typically, multiple spiders-and-egg cells will be placed adjacent to one another in a larger nesting structure.