1.
Heriadine Bees from the Belgian Congo
2.
African Bees of the Family Megachilidae (Gronoceras and Megachilidae) from Liberia and Belgian Congo
Heriadine and Related Bees from Liberia and the Belgian Congo (Hymenoptera, Apoidea)
African Bees of the Family Anthophoridae, Cheifly from the Belgian Congo and Liberia (Hymenoptera, Apoidea)
African Bees of the Family Ctenoplectridae from the Belgian Congo and Liberia (Hymenoptera Apoidea)
African bees of the Family Xylocopidae Principally from Liberia and the Belgian Congo
African Bees of the Family Megachilidae, (Anthidiinae, Serapista and Lithurgus) mainly from Liberia and the Belgian Congo. (Hymenoptera, Apoidea)
Bees from the Belgian Congo: Gronoceras and Digronoceras; A Case of Deceptive Resemblance
Some Bees of the Genus Ctenoplectra from the Belgian Congo
Bees from the Belgian Congo Some Species of Gronoceras (Megachilidae)