- A revision of the ant genus Leptogenys Roger in the Ethiopian region, with a review of the Malagasy species.
- A Revision of the Palaeotropical Arboreal Ant Genus Cataulacus F. Smith (Hymenoptera: Formicidae)
- A Revision of the Ponerine ant Genus Plectroctena F. Smith
- A Revision of the ant Genera Meranoplus F. Smith, Dicroaspis Emery and Calyptomyrmex Emery (Hymenoptera: Formicidae) in the Ethiopian Zoogeographical Region
- The ant Genera of West Africa: A Synonymic Synopsis With Keys