S. Mahunka szerk.: Folia Entomologica Hungarica 59. (Budapest, 1998)

222 Zs. Bokor valley, close to the source, near the village Szemére (Fig. 1) was studied. The climate of the valley is moderately cool, dry and a little bit warmer than the other part of Cserehát. Its yearly average temperature is between 8.7-8.9 °C. The biotopes (Fig. 1) studied: 1. A climazonal sessile oak-turkey oak forest (Quercetum petraeae-cerris) stand is spreading just to the stream bank, on a slight slope. The sampling sites in it represent the heterogeneity of the forest, lighter and darker patches of different canopy cover. 2. Wet meadow (Cirsio cani-Festucetum pratensis) at the beginning of the Kánás valley. 3. Tall sedge (Caricetum elatae) vegetation, next to the wet meadow. In the field we used soil traps (closed Barber-traps with ethylenglycol). The traps were covered on the soil level with thin twigs to collect only the smaller animals. This type of traps is very suitable for sampling of Opiliones because a lot of Hungarian species spend their juvenile stage very close to the soil surface. Only a few species search for food later as adults in the herb and shrub layer or on the bark of the trees. The sample times: 19. 05. 1992, 19. 06. 1992, 08. 10. 1992, 02. 09. 1992, 03. 11. 1992, 23.08. 1994. Considering the heterogeneity of the communities, more than one trap were placed in the biotopes. Three were in the forest, marked El, E2 and E3, two in the wet meadow: Kl and K2, one in the sedge. Fig l.The biotopes on the map of Hungary (Cserehát North Hungarian Middle Range) 1. The sessile oak-turkey oak forest patches, 2. the wet meadow, 3. the tall sedge vegetation