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

Ascogaster varipes: In the shrub layer of the pure oak forest at Csobánka in June and August 1992 and 1993 9, 5 and 1, 4 specimens, respectively, and in August 1994 2 specimens; in the same vegetation layer at Gödöllő only in June 1993 15 specimens were trapped; a total of 36 specimens in six samplings were captured. Both at Csobánka and Gödöllő the species was trapped in the canopy of the pure and mixed oak forests in a much less number and in time rather sporadically, i.e. in four samplings 12 specimens only. Its three tortricid hosts living in the oak wood explain fairly well the braconid's preference to the shrub layer. Cotesia tibialis: Our trapping data suggest its fairly strong preference to the shrub vegetation layer. At Csobánka in the shrub layer of the pure oak forest in June 1992 31 specimens, in June 1994 2 specimens; at Gödöllő (in the same vegetation layer) in the pure oak forest in June 1992, 1993 and 1994 7, 12, 2 specimens, respectively, in the mixed oak forest in August 1993 and 1994 4 and 19 specimens were trapped; i.e. totally in seven samplings 77 specimens. In the canopy of the pure oak forest a total of 31 specimens were trapped at Gödöllő in June 1992 and 1994 in three samplings, at Csobánka it was not captured at all. Worthy to note that in the young oak forest at Csobánka 1992 and 1993 12 and 2 specimens, at Gödöllő in June 1992 2 specimens were trapped. Consequently it means that this frequent to common braconid species in Hungary settles even in the young oak wood following its many (particularly noctuid) caterpillar hosts which are breeding also on young oak trees. Macrocentrus collaris: Similar to the previous species it has also a strong preference to the shrub layer. At Csobánka in shrub layer of the pure oak forest in August 1993 and 1994 16 and 7 specimens, respectively; at Gödöllő in pure oak forest in August 1993 15 specimens and in mixed oak forest in June 1992 13 specimens were trapped; i.e. totally in four samplings 51 specimens were captured. In the mixed oak forest at Csobánka, strikingly, only in the canopy 6 specimens were trapped. Both at Csobánka and Gödöllő 3 and 19 specimens were trapped in the young oak forest in June 1992. The braconid parasitizes many noctuid (Agrotis) caterpillar hosts living in oak forests. Microplitis mandibular is: Its occurrence is divided in the shrub and in the canopy layers at Csobánka; at Gödöllő, contrarily, it was collected only in the shrub layer. In the shrub layer it was trapped as follows: in pure oak forest at Csobánka in June and August 1993 5 and 15 specimens, in June 1994 6 specimens, in the mixed oak forest in August 1992, 1993 and 1994 10, 17 and 16 specimens were trapped; in pure oak forest at Gödöllő in June and August 1993 7 and 45, in June 1994 6 specimens, in the mixed oak wood in August 1 specimen, in June and August 1993 and 1994 1, 45 and 19, 24 specimens were trapped, respectively; i.e. a total of 217 specimens of fourteen samplings were taken in the shrub layer. In the canopy it was trapped as follows: in the pure oak forest at Csobánka in June and August 1992 15 and 15, in August 1994 13 specimens; in the mixed oak forest at Gödöllő in June 1994 9 specimens were trapped; i.e. a total of 52 specimens in four samplings were taken in the canopy. This braconid species rather prefers the shrub layer, which ecological claim is at most supposed on the basis of its known two noctuid hosts. d) Two braconid species, Aleiodes circumscriptus and Leiophron pallipes, were present equally in the canopy and shrub layers. Aleiodes circumscriptus: In the canopy a total of 116 specimens of nine samplings were trapped in the pure and in the mixed oak forests in three years (1992-1994). In the shrub layer a total of 61 specimens in six samplings were trapped both at Csobánka and