- A revision of the ant genus Leptogenys Roger in the Ethiopian region, with a review of the Malagasy species.
- The ant tribe Tetramoriini (Hymenoptera: Formicidae). The genus Tetramorium Mayr in the Malagasy region and in the New World. - Primary Source Edition
- Afrotropical species of the myrmicine ant genera Cardiocondyla, Leptothorax, Melissotarsus, Messor and Cataulacus (Formicidae).
- A revision of the ant genera Meranoplus F. Smith, Dicroaspis Emery and Calyptomyrmex Emery (Hymenoptera: Formicidae) in the Ethiopian zoogeographical region. - Primary Source Edition
- A Revision of the Palaeotropical Arboreal Ant Genus Cataulacus F. Smith (Hymenoptera: Formicidae)