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

Table 2. Values of Kendall's Tau B rank correlation analysis and levels of significance of the statistics where significant (= S) or not significant (= NS) at p < 0.05 level. — In the abbreviations the first letters indicate the layers: C = canopy layer, S = shrub layer; the second letters indicate the forest types: M = mixed forest, P = pure forest, Y = young forest; the third letters indicate the study sites: C = Csobánka, G = Gödöllő CYC CYG SPC CPC SPG CPG SMC CMC SMG CMG CYC X 0.114 0.109 0.285 0.101 0.205 0.012 -0.3818 -0.03813 -0.1156 CYG NS X 0.112 0.332 0.399 0.142 0.037 0.0923 0.18661 0.0159 SPC NS NS X 0.143 0.172 0.077 -0.045 0.0923 0.10146 0.07316 CPC S S NS X 0.132 0.175 0.208 0.4097 0.28437 0.12369 SPG NS S NS NS X 0.148 -0.0485 0.05115 0.25404 0.19403 CPG NS NS NS NS NS X 0.137 -0.02168 -0.02106 0.24738 SMC NS NS NS S NS NS X 0.09886 0.1307 0.20064 CMC NS NS S S NS NS NS X 0.30228 0.11363 SMG NS NS NS s S NS NS S X 0.4358 CMG NS NS NS NS NS S NS NS S X DISCUSSION 1. With the tangle trapping method a definite preference to the canopy as well as to the shrub layers was observable by several braconid species. These observations are quite new to us regarding the vegetation layer preference manifested by the braconid wasps (Table 1). a) Four species were trapped exclusively in the canopy: Diospilus capito, Earinus elator and Meteorus gyrator at Gödöllő, the first species in mixed, the second and third species in pure oak wood; Glyptapanteles fulvipes at Csobánka in mixed oak wood. In the case of D. capito and E. elator the hosts, Anobium and Ceutorrhynchus species as well as noctuid and geometrid species, respectively, are living mostly in the canopy which may explain the braconids' preference to this layer. D. capito and M. gyrator were trapped always in June 1992-1994, E. elator and G. fulvipes in August and June, respectively, in two years (1993-1994). b) Three species were trapped in an overwhelming proportion in the canopy layer: Macrocentrus pallipes: At Csobánka taken in the canopy and also in the shrub layers mostly in June and less so in August in three years; at Gödöllő taken only in the canopy in June in three years. All in all in ten samplings 139 specimens were taken in the canopy and in three samplings 20 specimens in the shrub layer. Microchelonus contractus: At Csobánka taken rather sporadically in the canopy and shrub layers in June and August in three years; at Gödöllő regularly in the canopy of the mixed oak forest and less regularly in the pure oak forest, in the shrub layer rarely. In ten sampling 39 specimens were taken in the canopy and in three samplings 3 specimens in the shrub layer. Ze/e albiditarsus: At Csobánka taken in the canopy of the pure oak forest in June 1992 (6 specimens) and in August 1993 and 1994 (3 and 4 specimens, respectively); at Gödöllő taken only in the shrub layer of mixed oak forest in June 1992 (2 specimens). It is somewhat conspicuous that at Gödöllő in the young oak forest 16 and 8 specimens were trapped in June 1992 and 1994, respectively. c) Four species were trapped overwhelmingly or mostly in the shrub layer (species trapped only in the shrub layer was not observed):