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

farm at Badacsonytomaj, 75% of the galls belonged to this species. It was present in the largest number (336) at the site Margitai-erdő, Hortobágy National Park. The species was found at 24 localities. In our other investigation based on Swiss material, this was the most common species (Dely-Draskovits et al. 1993). Among the samples, L. similis was found in a similar number (1036) as the previous species. The largest sample (332 galls) was taken from Fertő-Hanság National Park, mostly from reed stems standing in water. Another part of the material came from further 24 sites, which were drier than the mentioned locality. Lipara rufitarsis was represented in the lowest number (174 specimens) yielding only 4.5% of all the material. They were found at 16 localities. This is definitely a rare species proving to be most abundant at a dry site in Fertő-Hanság National Park, Hidegség. It was accompanied by the galls of L. lucens. HYMENOPTERA Out of 3893 Lipara galls Hymenopterans emerged from 412 galls (10.6%). The number of galls occupied by them (further on referred to it as "infected") are given by the Lipara species at the different localities in Table 2. The table reveals, that from 263 L. lucens galls Hymenopterans emerged. From this amount 249 were one-year-old and only 14 were two-year-old galls. The bulk of the Hymenopterans (63.8%) emerged from L. lucens and Lipara similis galls yielded Hymenoptera from 92 (22.3%) galls, and L. rufitarsis from 44 (10.8%) galls. They were very rare in L. pullitarsis galls, altogether only 13 (3.1%) galls of this species were infected. Based on the rearing results given above and on the number of samples, we could calculate the relative frequency of Hymenoptera in different Lipara species (further on referred to as the "extent of infection"). According to our data, most often L. rufitarsis galls were infected by Hymenoptera (25.2%), 16.4% of the L. lucens galls turned out to be infected, while 8.8% of L. similis. This value for L. pullitarsis was extremely low (1.2%). Concerning the number of localities, where Hymenopteran infection was observed, galls of L. lucens were infected at most sites (20 sites, 80% relative frequency of occurrence). L. similis galls yielded Hymenopterans at 15 sites (62.5%), while L. rufitarsis at 7 sites (43.7%). L. pullitarsis galls came from 24 localities, but only 4 (16.6%) of the sites were infected by Hymenoptera. In the latter case, it may be supposed, that the infection occurs at isolated locations. The reared Hymenopterans belonged to 20 species of 10 families (Table 3). Two of the species remained identified only on the family level. The rearing results of the species listed in Table 3 reveal that there are 9 species of parasitoid Hymenoptera developing in the pupae of different Lipara species. These are the following: Polemochartus aboletus, P. liparae, P. melas, Baryproctus barypus, Braconidae indet., Stenomalina liparae and Tetrastichus légionárius, Pachyneuron formosum, Pediobiusfacialis. The 55 specimens of an unidentified Ichnemonidae species, are possibly hiperparasitoids of any of the seven species mentioned above. Among the species reared in this study four (Sycophila fasciata, Torymus arundinis, Prosactogaster erdoesi and Platygaster sp.) developed undoubtedly not in the Lipara