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List of localities visited during a collecting trip to the Canary islands in the spring of 1947
Vol 91, Page 1
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On a small collection of Odonata from Teneriffe and La Palma
Vol 91, Page 6
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Addition to the knowledge of the Dermaptera and Orthoptera of the Canary Islands
Vol 91, Page 7
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Macrolepidoptera collected in Teneriffe and La Palma in the spring of 1947
Vol 91, Page 12
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On a small collection of Orthoptera from the Canary Islands
Vol 91, Page 23
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Contribution to the biology of Myrmica schencki Em. (Hym., Form.)
Vol 91, Page 25
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On Arachnida collected in Dutch greenhouses
Vol 91, Page 72
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The Fruit Tree Red Spider (Metatetranychus ulmi Koch, Tetranychidae, Acari) and its relation to its host plant
Vol 91, Page 83
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Description of the female of Holochlora pygmaea Karny (Orthoptera, Tettigonidae, subfam. Scaphurinae)
Vol 91, Page 103
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Epeolus rozenburgensis nov. spec (Apidae, Hym. aculeata)
Vol 91, Page 105
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Tropical seed beetles of the genus Coccotrypes Eichh. 99. Contribution to the morphology and taxonomy of the Scolytoidea
Vol 91, Page 113
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Ethologische waarnemingen aan een nest van Bombus e. equestris (F.) (Observations on a nest of Bombus e. equestris (F.) )
Vol 91, Page 121
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Le sous-genre Psen Mimumesa Malloch (Hym. Sphec.) (avec une liste des Psenini capturés aux Pays-Bas)
Vol 91, Page 135
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On some Hepialidae (Lepidoptera) from Patagonia. Critical remarks on the report nr 11 from the Ljungner's Expedition 1932-1934
Vol 91, Page 149
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Contribution a l'étude de la faune des Opilionides dans Ie Bassin des Carpathes
Vol 91, Page 153
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Watermijten uit Suriname
Vol 91, Page 159
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Studies in Cladiscus and allied genera
Vol 91, Page 180