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

SPHECIDAE Pemphredon lethifer (Shuckard, 1837) (=Cemonus) According to Waitzbauer (1969) one form of this species f. fabricii Müll, lives in reed stems and in two-year-old L. lucens galls. The species P. lethifer was found in L. lucens galls by Wolf (1988, 1991). Distribution: It is a rather common Holarctic species. Rearing data: L. lucens: 1:3. From two year old L. lucens galls. GASTERUPTIONIDAE Gasteruption kriechhaumeri Schletterer, 1889 It is likely that this species is a parasitoid of an inquiline Hymenoptera, which develops in two year old L. lucens galls. Distribution: Until today, it has been known only from Central Europe (Switzerland, Austria, Hungary). Rearing data: L. lucens: 1:4. COLLETIDAE Hylaeus sp. Rearing data: L. lucens: 1:8. REARING RESULTS COMPILED FROM THE LITERATURE To give an overlook of the role of reed belts in maintaining biodiversity and in protection of nature, 33 Hymenopterous species belonging to 13 families are listed below (Table 4). Each were reported in the literature as developing in Lipara galls as parasitoid or inquiline. Only those information are mentioned here which were accepted by the hymenopterist authors. There are two species which were described from Hungarian specimens (Tetramesa phragmitis Erdős, 1952 and Clytina giraudi Erdős, 1957). SPECIALIZATION ASPECT Based on our observations, several parasitoid species were found to rear only from a particular Lipara species, independent of the localities. This strong correlation presumably is due to the special needs of Hymenopterans when parasitising Lipara. In a particular case, the size of the parasitoid and the gallforming insect, or seasonal coincidences should be considered. Similar significance must be attached to the morphology of the galls (e.g. size, shape, structure, etc.).