_Section 1. Anthophila._
Family 1. Aphidæ or Honey Bees.
Family 2. Andrenidæ or Burrowing Bees.
_Section 2. Diploptera._
Family 3. Vespidæ or Social Wasps.
Family 4. Eumenidæ or Bramble Wasps.
Family 5. Masaridæ or Solitary Wasps.
_Section 3. Fossores._
Family 6. Philanthidæ or Bee-eating Wasps.
Family 7. Crabronidæ or Sand Wasps.
Family 8. Nyssonidæ or Fly-eating Wasps.
Family 9. Larridæ or Black Wasps.
Family 10. Sphegidæ or Grasshopper-eating Wasps.
Family 11. Pompilidæ or Burrowing Wasps.
Family 12. Bembecidæ or Scented Wasps.
Family 13. Sapygidæ or Bees' Nest Wasps.
Family 14. Scoliidæ or Beetle-eating Ants.
Family 15. Thymidæ or Stout-bodied Ants.
Family 16. Mutillidæ or Solitary Ants.
_Section 4. Heterogyna._
Family 17. Formicidæ or Social Ants.