S. Mahunka szerk.: Folia Entomologica Hungarica 57. (Budapest, 1996)
106 Z. Liicza et al. of farms. Mite species were extracted from the infested samples by modified BerleseTullgren funnel and were placed to Oudemans's fluid. In both cases the specimens were mounted to slides in de Faure's medium (Krantz 1978) or Keifer's medium (Keifer 1952). The species were identified according to Volgin (1969), Summers and Price (1970) and Hughes (1976). Voucher specimens were deposited in the Hungarian Natural History Museum, Budapest, in the Plant Health and Soil Conservation Station of Budapest and in the Pannon University of Agricultural Sciences, Keszthely. RESULTS AND DISCUSSIONS Cheyletid mites were found in 12 cases out of 868 plant samples collected from 269 tree and shrub species. The collected specimens occurred on 8 species of 6 plant families and in 50.8% of the samples they were associated with Quadraspidiotus gigas (Thiem et Gerneck), Qu. oslreaeformis (Curtis) and Pseudaulacaspis pentagona (Targioni-Tozzetti) scale insects. The most frequent species Cheletogenes ornatus was found under scales of the previous scale insects associated with Tetranychus (Acari: Prostigmata: Tetranychidae), Thyreophagus (Acari: Astigmata: Acaridae) and Hemisarcoptes (Acari: Astigmata: Hemisarcoptidae) mite species. The scales were used probably for overwintering. The specimens of Cheletacarus raptor in one case, the specimens of Prosocheyla oaklandi and P. traubi in two cases were collected from branches and trunks strongly infested by Quadraspidiotus gigas and Qu. ostreaeformis. Male was found only in one case in one sample of P. oaklandi. In another part of the surveys cheyletid mites were found in 34 cases out of 90 samples collected from 11 different stored products. The collected species occurred in 94.1% of the samples and were associated with phytophagous and saprophagous mite species of the families Acaridae, Chortoglyphidae and Glycyphagidae. The species of the genus Cheyletus were the most frequent, which mixed with the populations of each other and of Cheletomorpha lepidopterorum. All the three Cheyletus species were presented with variable number of individuals (10-240 specimens/10 cm 3 ) in the different stored cereals and fodder, but Ch. lepidopterorum was present with veiy low number of individuals (1-2 specimens/10 cm 3 ). Two females of Acaropsis docta were extracted from one sample. Males were found only in three Cheyletus species. The male:female rate has fluctuated seasonally. It increased in the end of autumn and reached 1:1 rate in the end of winter, in the beginning of spring and strongly decreased in the middle of summer. The enclosed key is good for females only because the male of the other species has not been found. LIST OF THE COLLECTED SPECIES* Cheletogenes ornatus (Canestrini et Fanzago, 1876) — Budapest, Gellérthegy, Crataegus laevigata, 1991. II. 5.; Budapest, Sasad, Populus simonii, 1991. IX. 13.; Budapest, Kispest, Prunus avium, 1992. IV. 2.; Budapest, Pestszentlőrinc, Crataegus laevigata, 1992. IX. 22.; Budapest, Gellérthegy, Pinus nigra, 1993. X. 19.; Budapest, Sasad, Species marked with an asterisk (*) are new for the Hungarian fauna.
