S. Mahunka szerk.: Folia Entomologica Hungarica 43/1. (Budapest, 1982)

Species 1979 1980 Species D p.c. DG D p.c. DG Tropiduchidae: Trypetimorpha fenestrata Costa 0.71 + D = dominance, DG = dominance group (+: below 1 p.c.; 1: 1-4 p.c.; 2: 4-16 p.c.; 3: 16-36 p.c.; 4: 36-64 p.c.; 5: 64-100 p.c.) data of wintering, resulting from the above-mentioned way could not reflect the situation, which would have been characteristic only of the higher terrain, because the wind furrows provided an opportunity for some species, which could not have been able to survive all the year or to spend the winter in the same place to occur on the sand hills. The ecological valence data were less influenced by the results of investigations in 1979-1980. The proportion of species specific for dry-grasslands slightly increased (51.82 p.c.). The rate of indifferent species increased (14.29 p.c.) at the expense of xerophilous ones. The proportion of not characteristic species decreased (6.12 p.c.). V. Supplementary notes to the faunistical data gamed by other collecting methods Since there is not any perfect method for collecting all types of insects, if we want to survey the fauna of an area, we have to use some different methods in order to be able to form a rather exact notion of the qualitative structure of the fauna, living in the investigated area. Malaise trap was used in the area in 1976 and we used 70 Barber traps in 1979-1980, but not definitely in order to the above-mentioned aims. The Malaise trap collects mainly flying insects, so the collected material cannot be referred neither to the sand hills, nor to the wind furrows. Some leafhoppers captured by the trap must have flown from the nearly poplar forest or from the grazed area. That is why I list only the species which were not collected with any other methods, insted of giving detailed list. These are: Eurysa clypeata Horv., Kybos abstrusa Linn., Typ hi ocyba sexpunctata Fall., T. candidula Kirschb., Cicadula placida Horv., Aphrophora salicina Goeze. We can count the animals collected by any of the 70 Barber traps rather among the fauna of the investigated area. We put Barber traps not only in the two terrains, but some groups were placed in the area between the two terrains as well. So 35 traps were on the sand hills, 10 were in the wind furrows and 25 traps were between the two terrains. We can see the dominance relations counted from the average number of individuals being in 5 traps in Table 3. It is interesting, that 46 species were found in 1979 and 41 in 1980 in the Barber traps. 52 species were found together in the two years, and this number is much more than the number of species collected with biocenometer (44). 25 species were not joint, and 8 of them occurred only in the sucked material, 17 of them were only in the Barber traps. We were able to colUbt three specieB of the latest group (Metadelphax propinqua Fieb., Streptanus aemulans Kbm., Handlanus ignoscus Mel.) only in this way. The other species must have belonged to the leafhopper community of the wind furrows. On the contrary the Barber traps placed in the wind furrows captured 29 species in 1979, 22 species in 1980, a total of 31 species in the two years, while during the same time 57 species were in the biocenometric materials. 28 species were not joint, and only one of them (Kosswigianella exiqua Boh.) was alone in Barber traps, the others were only in the biocenometric samples. We can explain these facts in the following ways: Since the Barber trap is suitable mainly to collect animal populations moving on the ground level, more leafhopper populations are living or moving near the ground level on the sand hills. The considerable part of leafhopper populations in the wind furrows lives and moves rather on the higher plant parts. On the other hand, the plant cover is straggling on the sand hills, and the moving specimens often get to the ground, while the probability of it is much less in the wind furrows because of the higher vegetation and high plant cover. There was not any species in the Barber traps in the wind furrows, which were characteristic only on the sand hills on the basis of biocenometric samples. However, 14 species were