Philanthus gibbosus is a bee-hunting wasp, the most common and widespread member of the genus in North America. Females construct nests in soil cavities and adults feed on nectar. Females will actively stalk bees (commonly Halictidae) & wasps that are busy gathering nectar and pollen themselves and will use this prey to provision their nests for food when their eggs hatch.
Most of North America. Areas of other small foraging bees & wasps.
Observed on Shasta Daisy (Leucanthemum x superbum).