S. Mahunka szerk.: Folia Entomologica Hungarica 55. (Budapest, 1994)

moth caterpillars: three tortricids (Grapholitha compositella Fabricius, Laspeyresia pactolana Zeller, L. zebeana Ratzeburg) and one gelechiid (Gelechia rhombella Denis et Schiffermüller) (Tobias 1986: 305), all four moth species are frequent in Hungary. In Síkfőkút the Grapholitha and Gelechia species mentioned before may play a role as hosts of A. varipes, they are feeding in fruits and leaves of various fruit-trees (Prunus, Pyrus, Cerasus) which are also sporadic in the oak forest; Laspeyresia species are pests of spruce and larch, respectively, so they were absent here in the oak forest, hence A. varipes can not find them as its hosts. c) For Atanycolus denigrator see section No. 4. d) Bracon variegator is a frequent to common species in Hungary and from among its many hosts (Shenefelt 1978: 1613, Tobias 1986: 119), supposedly, Tortrix viridana may be the potential host at Síkfőkút. By the way T. viridana is frequently a severe injurious pest in the oak-woods of Hungary. The braconid was gathered in the three layers of the oak forest and in the meadow yet in a fairly low number. Surprisingly, the trapping time is restricted to the interval 27-30 August in the shrub layer and 6-16 October in the canopy and over canopy; in the meadow to the two days 28 June and 9 October (Table 1). The time of the trapping of the braconid species coincides well with the appearance of the first and second instars of the tortricid caterpillars which are the most appropriate development stages for their parasitization. Caterpillars of T. viridana in 1987, supposedly, were present in a rather low number in the oak forest of Síkfőkút, i.e. considerably below the level of gradation preventing a heavy damage regarding the practice of forestry. e) Homolobus truncator is a true ophionoid wasp, i.e. a crepuscular and nocturnal species attracted by light-trap (Huddleston & Gauld 1988), however, it is on the wing in daylight too. The species is frequent in Hungary. In Síkfőkút it was trapped fairly equally in the forest (except over canopy) and in the meadow. Its hosts are noctuid (e.g. Agrotis species) pests of farm crops, pest (Panolis flammed) of firs, and probably, in Síkfőkút the geometrid Lycia (or Bistori) hirtaria Clerck. The latter lepidopterous host is polyphagous on broad-leaved trees. The braconid'

s flying period from 23 June to 16 October in the forest and from 24 July to 26 October in the meadow (Fig. 4) is perfectly synchronous with the geometrid caterpillar's (1-3 instars) activity from July to September (Győrfi 1957:468). 3. A total of 10 braconid species (16.6% of the 60 species) were trapped exclusive in the oak forest disregarding the height where they fell into the traps. The species are as follows: 25-27 m + 12-14 m + 0-3 m - 2 species: Atanycolus denigrator, Macrocentrus flavus 25-27 m + 12-14 m - 1 species: Aleiodes gastritor 12-14 m + 0-3 m- 4 species: Meteorus colon, Microplitis deprimator, Phanerotoma acuminata, Spathius erythrocephalus 25-27 m + 0-3 m- 3 species: Aleiodes circumscriptus, Colastes pubicornis, Meteorus oculatus 4. The rest of the braconid species (9 species, 15% of the 60 species) were trapped both in the oak forest (in its one or two plant layers) and in the meadow. The species are listed below with a similar height indication as in section No. 3: 25-27 m + 0-3 m + 0-1 m - 2 species: Chelonus oculator, Microplitis fulvicornis