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The genus Lipara Meigen (Diptera, Chloropidae), systematics, morphology, behaviour, and ecology

Published in Tijdschrift Voor Entomologie, in 1974, in volume 117, pages 1-25

Pyralidae of the Third Archbold Expedition. 1. Subfamily Odontiinae (Lepidoptera)

Published in Tijdschrift Voor Entomologie, in 1974, in volume 117, pages 27-37

Revision of the Psenini of the Ethiopian Region, including Malagasy (Hymenoptera, Sphecidae, Pemphredoninae)

Published in Tijdschrift Voor Entomologie, in 1974, in volume 117, pages 39-101

On American Aphids, with descriptions of a new genus and some new species (Homoptera, Aphididae)

Published in Tijdschrift Voor Entomologie, in 1974, in volume 117, pages 103-155

Review of Central and East Asiatic Habropoda F. Smith with Habrophorula, a new genus from China (Hymenoptera, Anthophoridae)

Published in Tijdschrift Voor Entomologie, in 1974, in volume 117, pages 157-224

Systematics and evolution of the Palaearctic Spialia species (Lepidoptera, Hesperiidae)

Published in Tijdschrift Voor Entomologie, in 1974, in volume 117, pages 225-271

The Gravenhorst, Schiødte and Foerster types belonging to the genus Megastylus Schiødte, 1838, with keys to the species (Hymenoptera, Ichneumonidae, Microleptinae)

Published in Tijdschrift Voor Entomologie, in 1974, in volume 117, pages 273-285