14 spp. in our area (all Pseudomasaris
), ~300 spp. in 14 genera of 2 tribes total(1)
Yellow (or white) and black. FW with only two submarginal cells. Clubbed antennae are distinctive.
worldwide; in NA, western(1)
larvae (unlike those of other vespids) feed on pollen and nectar
The females make nests of mud or sand attached to twigs or rocks. They provision the nests with pollen and nectar and lay their eggs. The eggs hatch into larvae that eat the provisions, then pupate and emerge as adults.
Bradley J.C. (1922) The taxonomy of the Masarid wasps, including a monograph of the North American species. UC Publ. Entomol. 1: 369-464. (Full text