S. Mahunka szerk.: Folia Entomologica Hungarica 57. (Budapest, 1996)

Table 1 (continued) Csobánka Gödöllő M P Y M P Y 48. Taphaeus hiator 1 49. Triaspis pallipes 7 50. Zele albiditarsus 6 13 12 18 24 A total of 50 braconid species 27 29 14 22 24 13 in 1793 specimens In the three oak forest stands (of the two areas) the tangle traps were hanged in the following distribution: Elder mixed oak forest stand: shrub layer 4 traps; canopy layer 4 traps; Elder pure oak forest stand: shrub layer 4 traps; canopy layer 4 traps; Young oak forest stand: 4 traps; Total 20 traps The traps were hanged at a fairly long distances from one another, usually about 100200 m. Both in the oak forests of Csobánka and Gödöllő two samplings a year were carried out, i.e. six samplings have been taken during three years in one investigation area or a total of twelve samplings were made in both areas within the project. Csobánka: 20.05-03.06 and 26.08-09.09.1992; 08.06-22.06 and 10.08-24.08.1993; 08.06-22.06 and 04.08-18.08.1994. Gödöllő: 20.05-03.06 and 26.08-09.09.1992; 09.06-23.06 and 11.08-25.08.1993; 09.06-23.06 and 05.08-19.08.1994. The traps were numbered from 1 to 20 and entered in a note-book registering the data of the area, plant associations and the collecting. The braconids (and other entomophagous insects) were removed one by one from the glue and after cleaning with terpenol and xylol placed in alcohol in vials marked with the respective trap numbers. In the cluster analysis average links and percentage method were chosen and calculated by SYN-TAX-pc 5.0 (Podani 1993). Rank correlation, Kendall's rank correlation was made by SPSS/PC+ (Norusis 1986) program package. The Shannon-Wiener diversity index was calculated by STAT-ECOL (Ludwig and Reynolds 1988) program package. RESULTS Altogether 1793 specimens belonging to 50 braconid species were gathered with the help of tangle traps during the years of 1992-1994 with the collecting method as indicated before (Table 1 ). The comparison of the species as well as the specimen numbers give the following figures in the two investigation areas: Csobánka: A total of 896 specimens belonging to 36 species were trapped, of which 173 specimens of 19 species turned up only here. Gödöllő: A total of 897 specimens belonging to 31 species were trapped, of which 117 specimens of 12 species turned up only here. It is somewhat interesting to note that synchronically with the braconids 63 tachinid fly species of 220 specimens were trapped. The deviations of the braconid versus tachinid species and specimen numbers are conspicuous. Are perhaps the tachinid flies more