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| | Catalog of Sphecidae |
 | | In the XIXth century, these wasps (except Heterogynaidae, added in 1969) were often combined with other primarily ground-nesting Hymenoptera into a single group, Fossores, now known to be artificial. |
| | Alexander's results were somewhat inconclusive, but Prentice and Melo independently subdivided the extant Apoidea into five monophyletic families: Heterogynaidae, Ampulicidae, Sphecidae, Apidae, and Crabronidae. |
| | The catalog's main objective is to allow quick orientation in the vast body of the available literature on the four included families. |
| www.calacademy.org /research/entomology/Entomology_Resources/Hymenoptera/sphecidae/Genera_and_species_PDF/introduction.htm (500 words) |
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