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

12-14 m + 0-3 m + 0-1 m- 4 species: Acampsis alternipes, Atanycolus initiator, Earinus elator, Meteorus consimilis 0-3 m + 0-1 m - 3 species: Doryctosoma paradoxum, Microplitis eremita, Microtypus wesmaeli a) Acampsis alternipes is rather sporadic in Hungary, hence its trapping in a relatively high number in the Síkfőkút oak forest is somewhat unexpected. From this dispersion figure is obvious that the braconid prefers the shrub layer - perhaps its still unknown host(s) is associated also with this layer. In Hungary a few collecting data seem to confirm that A. alternipes prefers to subsist in oak forest. Regarding the sex division it is incomprehensible why merely males fell into the traps in Síkfőkút? In general, females had been collected in about an equal number with males in Hungary. b) Atanycolus denigrator and A. initiator complicate their presence in the oak forest regarding their longicorn larva hosts feeding exclusively in firs {Picea, Pinus). It is worthy to note that A. denigrator was represented only by males and A. initiator only by females in Síkfőkút 1987 - although, the other sex of both species is equally frequent in Hungary. The flying periods of the two Atanycolus species are irregular, the specimens had been trapped in distant days from 17 May to 29 November (A. denigrator 7 days, A. initiator 6 days) (Table 1). The food-plant of the longicorn larva (Cerambycidae: Acanthocinus aedilis, Rhagium sp., Tetropium sp.) is Scotch fir. A fir plantation lies nearest to the field of the project about one km away therefore there seems fortuities to suppose that the Atanycolus wasps cover the indicated distance. Perhaps the wasps (imagoes!) have been looking for their own food-plants to suck nectars etc. from flowers. Another version of the solution of this enigma might be to suppose that longicorn beetle species, which feed particularly in oak trees, is host for the braconids in question. c) The agathiine Earinus elator specimens were trapped in the layers of the forest and in the meadow in fairly similar numbers, however, the trapping time-periods were significantly deviating: in the canopy (12-14 m) from 18 April to 29 May, in the shrub and herb layer (0-3 m) from 17 April to 24 July, in the meadow from 12 April to 19 June and in the isolate day of 6 October (Fig. 3). Three noctuid caterpillar species are recorded for E. elator: Agrochola circellaris is polyphagous on dicotyledonoid herbaceous plants, Agrochola lota and Cirrhia centrago are feeding on leaves of several species of trees, excepting oak. This combination of hosts as well as their requirements of food-plants is in some controversy with the relatively high number of the braconid species as well as with the quantitatively less significant components of the food-plants of the moth hosts in Síkfőkút. Supposedly, the declining of a moderate gradation of one of the three hosts was indicated by the increased number of E. elator, or, again supposedly, there is a fourth and still unknown moth host of the braconid in question whose host's food-plant is either an oak or another plant species (shrub, herb) likely present in a rather dominant quantity. d) Meteorus consimilis was trapped only in males in the canopy and in the shrub layers of the oak forest, furthermore, in the meadow (again the absence of the females is incomprehensible; in Hungary the females and males were taken in equal proportion). The relatively high number of the braconid is rather inconsistent to the requirement of the food-plant of its wood-fretter host Scolytus multistriatus, namely, the scolytid larva is xylophagous in elm-trees (Ulmus species) which are very sporadic in the Síkfőkút oak