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Systematics and geographic history of the genus Pyrgus in the Palaearctic region (Lepidoptera, Hesperiidae)

Published in Tijdschrift Voor Entomologie, in 1972, in volume 115, pages 1-121

Some observations on the behaviour of females of Philanthus triangulum (F.) (Hymenoptera, Sphecidae)

Published in Tijdschrift Voor Entomologie, in 1972, in volume 115, pages 123-139

Notes on the behaviour of males of Philanthus triangulum (F.) (Hymenoptera, Sphecidae)

Published in Tijdschrift Voor Entomologie, in 1972, in volume 115, pages 141-151

Contribution to the knowledge of Oriental Psenulus (Hymenoptera, Sphecidae, Psenini)

Published in Tijdschrift Voor Entomologie, in 1972, in volume 115, pages 153-203

Differential use of the habitat by Pardosa pullata (Clerck) and Pardosa prativaga (L. Koch) in a mixed population (Araneae, Lycosidae)

Published in Tijdschrift Voor Entomologie, in 1972, in volume 115, pages 205-215

Further studies on South American Gomphidae (Odonata)

Published in Tijdschrift Voor Entomologie, in 1972, in volume 115, pages 217-240

Remarks on Matsumuraeses Issiki, with descriptions of new species (Lepidoptera, Tortricidae, Laspeyresiini)

Published in Tijdschrift Voor Entomologie, in 1972, in volume 115, pages 241-252

Further studies on Old World Melectine bees, with stray notes on their distribution and host relationships (Hymenoptera, Anthophoridae)

Published in Tijdschrift Voor Entomologie, in 1972, in volume 115, pages 253-324

Life cycle of Apodemopus apodemi (Fain, 1965) (Glycyphagidae: Sarcoptiformes Acari)

Published in Tijdschrift Voor Entomologie, in 1972, in volume 115, pages 325-339