Sapyga louisi is a species of a club-horned wasp in the family – Sapygidae.

[2] S. louisi is distinguished from its allies by its small size and by the yellow body markings it has.

The inner orbits are marked from the mandibles to nearly the upper margin of the eye.

The thorax is marked with a narrow band at the anterior margin that is narrowly interrupted as well as the lateral spots behind on the pronotum, a pair of spots on the scutellum, and a band on the post-scutellum.

The male differs from the female in aspects of having reduced yellow markings, lacking the spots on the lateral margins of the pronotum, the scutellum, and sternites 3 and 4.