Rotarides Mihály (szerk.): A Magyar Természettudományi Múzeum évkönyve 32. (Budapest 1939)
Szent-Ivány, J.: The migration of the Pieris brassicae in Hungary in the year 1937
The greater part of the migrating animals were female. The proportion between males and females was about 1 : 10. We may explain that the plants at Balatonfüred they were feeding on had been gnawed at to full extent and that the plants remaining were loaded with eggs, consequently the females did not know where to lay their further eggs and set out on migration. 2. GY. FÁBIÁN observed this mass migration of the Pieris brassicae at another spot of the Balaton lake. FÁBIÁN watched them as they flew for hours in masses forming clouds and in a width of several 100 metres from the Badacsony mountain towards the Somogy shore. The animals flew and filled the air in different heights from 1—2 metres on up to about 50 metres above the surface of the Balaton. The direction of the flight was NW — SE. The migrating mass partly settled down on the meadows behind the pine woods bordering the shore and paired there in great masses. I note that the distance of the two shores is about 6 kilometres. 0 5 10 15 km 3. A. ILLÉSY observed the migration of the large white on the shore of the Fertő lake on the 25-th July 1938 at 5 o'clock in the afternoon. The butterflies came from Mörbisch in the Burgenland and flew in the direction of the village Fertőboz. The migratory direction was therefore the same as the aforementioned one: NW— SE.
