S. Mahunka szerk.: Folia Entomologica Hungarica 56. (Budapest, 1995)
ated along the southern border of the National Park. An euryoecicous-hylophilous species (Józan 1985: 83). Regarding its ecological requirements it seems to be a true arboricolous species: it is nesting in decaying wood-trunks and preying on aphids to nurse its brood. Aphids are breeding usually in a high quantity in oak forests. The species was caught fairly continuously from 10th May to 25th June, 1 ? in 23rd August (see Table 7, too). Psenulus fuscipennis has been trapped in all four vegetation layers along with further two species (Trypoxylon attenuatum and T. fronticorne). In Hungary it is fairly evenly distributed although not frequent (Bajári 1957: 78). It was not recorded from the Bükk National Park (Józan 1993). Considering its nesting habit two ecotypes are recognizable: nest is built in dry stems of reed or in abandoned insect (cerambycid, scolytid, syricid etc.) tunnels in decaying wood (Lomholdt 1975: 165-166, Oehlke 1970: 732733). Food for the broods are aphids similar to the former two species. These bionomical requirements are available in oak forest hence the species may be characterized as a true arboricolous species. This fact is strengthened by the trapping data too: from among the sixteen specimens (12 99 + 4 dd ) eleven were taken in the canopy and shrub + herb layers, i.e. within the forest and the rest of the specimens are shared between above the canopy and the meadow as 4 99 + 1 d , respectively. The days of the trapping show a rather haphazardous run from 3rd May to 9th October; it was not taken in September. Psenulus pallipes is distributed in the Palaearctic Region; in Hungary frequent to common. Only a single locality was given from the Bükk National Park completed with the remark that "many further localities are expected" from the Park (Józan 1993: 413). The species prefers to construct its nest in hollow plant stems like reed, rose, currents, blackberries. As food for broods aphids are preyed on (Lomholdt 1975: 166-168, Oehlke 1970: 734). The collecting data refer to a preference of adhering to wooded environment. Twenty-three specimens (20 99 + 3 dd ) were trapped, this herd is shared among three vegetation layers: the majority (11 99 + 3 dd ) fell into the trap in the shrub + herb layer, 8 99 in tne canopy and a single female above the canopy, in the meadow no specimen was taken (see Table 7, too). Regarding the nesting and preying habits as well as trapping results P. pallipes, similar to P. fuscipennis, seems also to be a true arboricolous inhabitant. Trypoxylon attenuatum and T.figulus are fairly identical in distributional, ecological etc. characters. In the Bükk National Park only T. figulus was recorded (Józan 1993: 413). The two species are hypereuryoecicous-intermediary (Józan 1985: 84). Both species are distributed in the Palaearctic Region, frequent to common all over Europe. Besides other nesting niches (e.g. thatched roofs) both species select hollow plant stems like reed, blackberries etc. as well as abandoned buprestid, cerambycid, scolytid etc. labyrinths in decayed wood. The animals preyed on are spiders living on the soil and lower herbaceous plants in forest (Lomholdt 1976: 266-267, Oehlke 1970: 723-725). Their trapping figures show some differences (see Table 7). T. attenuatum has been taken in all the four plant layers in twelve (6 99 + 6 dd ) individuals, in the shrub + herb layer 3 9? + 1 d and in the meadow 4 dd , the remainder in the canopy (2 99 ) and above the canopy (1 9 )• T. figulus has been taken in three layers in sixteen specimens (4 99 + 12 dd ), 3 99 + 8 dd in the shrub + herb layer, 1 9 + 3 99 m me canopy and 1 d above the canopy, in the meadow no specimen was taken. The observations confirm repeatedly the arboricolous preference of these species.
