Food
It feeds its larvae progressively with adults of at least eight families of flies: Tabanidae, Stratiomyidae, Asilidae, Bombyliidae, syrphidae, Calliphoridae, Tachinidae, and Muscidae.References:
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https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=1052149#nullhttps://www.researchgate.net/publication/254325447_Hunting_behavior_by_the_sand_wasp_Rubrica_nasuta_Christ_1791_Hymenoptera_Sphecidae