Various diagnostic characters. A–C dorsal view of propodeum A Sphex argentatus, ♂ no ridges on propodeal enclosure B Sphex darwiniensis, ♀, fine ridges on propodeal enclosure C Sphex sericeus, ♂, marked ridges on propodeal enclosure D–F dorsoposterior view of scutellum D Sphex argentatissimus, ♀, scutellum convex without notable impressions E Sphex mimulus, ♀, scutellum flat F Sphex latilobus, ♂, scutellum convex with notable impression.