1.
Honigbijen, solitaire bijen en hommels in gevaar?
2.
The gentle driver ant "Baongo", discovered by Miss Vinall at Bongandanga, Belgian Congo.
Zur Kenntnis der Termiten und Termitengäste vom Belgischen Congo.
Lordomyrma infundibuli (Hym., Formicidae), a new species of ant from Dutch New Guinea.
Ireneidris myops gen. et sp. n. (Hym., Formicidae) from Waigeu Island, Dutch New Guinea.
Supplement aux fourmis de France et de Belgique.
Three new genera of ants from the Dutch East Indies.
Descriptions of new ants, chiefly from Waigeu Island, N. Dutch New Guinea.
Formicides des collections de S.A.R. le Prince Léopold de Belgique. Voyage aux Indes Orientales, 1932.
Contribution à la faune de Belgique. Notes diverses.