Arachnologische Mitteilungen 56

26 O. Machač, J. Christophoryová, K. Krajčovičová, J. Budka & J. Schlaghamerský identified only to family level (Tab. 1). Pitfall traps placed in tree hollows yielded 157 specimens belonging to 20 taxa and 11 families (Fig. 4a).The most abundant species trapped in the tree hollows were Tegenaria ferruginea (Panzer, 1804) and Midia midas (Simon, 1884).The most species-rich fami- ly in the pitfall traps was Linyphiidae with six species and a group of species identified only to family level. Most spiders collected in hollows are horizontal web builders. Seven spi- der taxa were obtained exclusively by pitfall traps. A total of 226 specimens belonging to 41 taxa were obtained from trees in forests and 96 specimens from 27 taxa from solitary trees in meadows. Twenty taxa were obtained exclusively from oak hollows situated in forests, six taxa were obtained exclusively from solitary trees in meadows. Traps installed on dead and live trees yielded 139 specimens belonging to 34 taxa and 183 specimens from 40 taxa, respectively. Seven species were ob- tained exclusively from dead trees. Exclusively in live trees, 13 taxa were present (Tab. 1). Fig. 2: Sampling methods used during the current study. a. Flight interception trap (FIT) (photo J. Schlaghamerský); b. Pitfall trap (PT) inside a tree hollow (photo J. Budka) Fig. 3: Typical hollow dwellers. a. Midia midas , body length 3.5 mm (photo R. Macek); b. Larca lata , scale bar 2 mm (photo J. Christophoryová)