Sceliphron spirifex is a species of sphecid wasp. It has a medium-sized body (17–27 millimetres or 0.7–1.1 inches), which is dull black with a long, yellow petiole (waist). The legs are black with yellow bands, the antennae are black and the wings are clear.Females build large multi-celled mud nests attached to cliffs, rocks, tree trunks, bridges and buildings. The cells are mass-provisioned with several spiders and sealed with mud.S.