Aphid wasp can refer to wasps in Apoidea:
Ammoplanidae, a family of apoid wasps that is most sister to bees Pemphredonidae, a family of apoid wasps with up to 2 submarginal cells in the forewing Psenidae, a family of apoid wasps with 3 submarginal cells in the forewing
See also:
Aphidiinae, a subfamily of parasitoid wasps called aphid mummy wasps