S. Mahunka szerk.: Folia Entomologica Hungarica 43/1. (Budapest, 1982)
Anaceratagallia ribauti, Aphrodes albiger , A. elongatus, A. histrionicus , Austroagallia sinuata , Bobacella corvin a, Doratura homophyla , Psammotettix slovacus , Trypetimorpha fenestrata . b) Species living equally in xerophilous, mesophilous and hygrophilous biotopes but preferring the former (X-M-H): Deltoc ephalus pulicaris , D oratura stylata , Eupelix cuspidata , Eupteryx no- tata, Euscelis incisus, Turrutus socialis , Xanthodelphax stramineus . c) Species living in all the three biotope types without any preference (X-M-H): Aphrodes bi cinctus , Mocydiopsis parvicauda , Psammotettix alienus , P. confinis , Eu rysula lurida, Gravesteini ella boldi , KosBwigianella spinosa , Ribautodelphax albostriatus, Struebinglanella elegantula, Lepy- ronia coleoptrata . d) Species living in all the three biotope types, but they prefer the mesophilous one (X-M-H): Athysanus argentarius, Balclutha punctata, Graphoc raerus ventralis , Weidnerianella marglnata . e) Species living in all the three biotope types, but they prefer the mesophilous and hygrophilous ones (X-M-H): Aphrodes serratulae , Cicadella viridis , Jassargus sursumflexus , Macustus grisescens, Megophthalmus scanicus , Kelisia vittipennis , Neophi la enus lineatus , Philaenus spumarius . Dry grassland species are dominant in the wind furrows, too (40,0 p.c.). 26.15 p.c. of the species are xerophilous, 15.38 p.c. are indifferent and 18.46 p.c. are of other ecological character. Comparing these values ..with the data of the leafhopper community occurring on the higher terrain (GYORFFY, 1980 A), as well as with SCHIEMENZ' s data (1969), it is conspicuous, that the rate of specific species is lower, or the rates have been displaced towards the indifferent and not characteristic species. This also indicates that the wetter wind furrows support the life conditions of many species, which cannot survive only on the extreme sand hills. Thus the species richness of the area is considerably increased resp. ensured by the presence of wind furrows. On the one hand they have their own special leafhopper populations, and on the other hand, are probably shelters for certain populations of the sand hills, when the environmental conditions become intolerable for them on the higher terrain (e.g. in the years of drought). The detailed investigations of this supposition will be carried out later. ÍV. The leafhopper fauna on the sand hills in 1979-1980 During the investigation of leafhoppers occurring on the upper terrain (GYORFFY, 1980 A) the evaluations of data referring only to 1977-1978 were carried out. We have to evaluate the data of the next two years (1979-1980), if we want to get more exact figures about the fauna of the whole investigated area and exactly compare them with the former results (Table 2). Psammo tettix provinciális was a dominant species in 1979, but it was forced into the group of subdominant species by Paluda vitripennis in 1980. Subdominant were 4 species in 1979 and 6 species in 1980. These species were 67.15 p.c. of the leafhopper populations in 1979 and 58.19 p.c. in 1980. In comparison with the results in, 1977-1978 it is new, that the dominance of Paluda vitripennis was gradually increasing. That species was among the accessory species in the two earlier years, but it was subdominant already in 1979 and it became the only dominant species in 1980. Aphrodes bicinctus was subdominant in the earlier years, but it disappeared from the sand hills in 1980. The importance of Philaenus spumarius and Lepyronia coleoptrata decreased, while they were replaced by Ribautodelphax albostriata , Mendrausus pauxillus and Ommatidiotus incospicuus. It is necessary to complete the results of the earlier paper (GYORFFY, 1980 A) with the following: The group of Kelisia sp. can be divided into two species. Kelisia monoceros had a percentage of dominance (0.71 p.c. in 1977 and 0.83 p.c. in 1978) and Kelisia perrieri had 0.26 p.c. of dominance in 1977. The group of "other Cicadellidae" was represented by Macrosteles salinus (0.83 p.c.), the group of "other Delphacidae" was represented by Kosswigianella exiqua (0.27 p.c.), Toya minuscula (0.27 p.c.), Ribautodelphax boldi (0.27 p.c.) and Weidnerianella pellucida (0.27 p. c.) in 1978. On the basis of the data of four years we could collect a total of 57 species, in 1977 35, in 1978 34, in 1979 44 and in 1980 31 species, respectively. If we investigate the bionomical data together in the 4 years, we can establish, that 40.38 p. c. of the species occurring on the sand hills are univoltine, and they overwinter in egg form, 25.0 p.c. are bivoltlne and winter in egg form. 17,3 p.c. of the species spend the winter as larvae and 17.3 p.c. spend the winter as adults. 57.69 p.c. of the species are univoltine, 42.31 p.c. are bivoltine. The rates resulting from the data of 1977-1978, were gratly changed by the results of the latest two years. The relatively high proportion of the species wintering as larvae or adults may be caused by the fact, that they overwinter in the wind furrows. Therefore the
