Herbivorous-wasp
Guides
Pseudomasaris occidentalis
Western pollen wasp
Pseudomasaris occidentalis is a solitary wasp in the subfamily Masarinae, commonly known as the western pollen wasp. Unlike most wasps that provision their nests with prey, masarine wasps are unique among vespids in feeding their larvae exclusively on pollen and nectar. The species is native to western North America and is one of approximately 14 species in the genus Pseudomasaris, all of which are restricted to North America.