Dr. D. C. GEIJSKES has presented to the Rijksmuseum van Natuurlijke Historie a water-beetle carrying six Ancylidae on its elytra which he found in a vegetation of water-hyacinth ( Eichhornia crassipes (Mart.) Solms) in the Coropina Creek near Bersaba, Suriname District, Surinam, on 9 March 1947. The little snails were tentatively identified as Anisancylus obliquus (Broderip & Sowerby) by Dr. J. B. BURCH (in litt. 18.XI.1965). Dr. BURCH was so kind as to send the beetle for identification to Dr. F. N. YOUNG who wrote about it (in litt. 2.XII.1965) as follows: ‘This is Megadytes laevigatus Olivier. There are several species now placed under that name, but this compares well with specimens from Cayenne which I consider to be true laevigatus;