S. Mahunka szerk.: Folia Entomologica Hungarica 56. (Budapest, 1995)

collectings with isolators. In each case 16 (4 x 4) 0.1 m

2 pan traps of indefinite (dull creamy) colour were exposed in a 30 x 30 m network for three hours in one sampling (oriented to the wind direction). Water with some detergent was used; insects were filtered out and preserved in 70% alcohol for study. Air temperature just on the ground and at a depth of 5 cm were measured in °C. The wind speed was always measured at 3 m height (supposedly the height of air-borne minute dung inhabiting flies). In several cases singling for flies and beetles were also made in order to supplement data. The voucher specimens are deposited in the collection of the Department of Zoology, Hungarian Natural History Museum, Budapest. RESULTS AND DISCUSSION Data of flies captured by the isolators are summarized in Table 1 (altogether 11 215 specimens). At Forráspuszta (below: FP or F) in 1992 four, at Vértesboglár (VB or V) in 1992-93 seven, at Kunszentmiklós (KSZ or K) in 1991-94 21 series of samples were taken (VB930914 was formed from 6 isolator samples only). When coding the samples, two or three letters for the site and two numerals each for the year, month and day were used (e.g. VB930914 is for the Vértesboglár site on the 14th of September, 1993). In the data matrix of 122 x 32 = 3904 cells there are only 655 non-zero cells. At Forráspuszta 650 specimens of 55 species (mean number of species per sample series is 23.5), at Vértesboglár 884 specimens of 60 species (mean species number/ sample series is 21.43), at Kunszentmiklós 9 681 specimens of 96 species (mean species number/sample series is 16.6 spp. for 1992, 19.75 spp. for 1993 and 24.0 spp. for 1994) were collected. In 32 sample series a total of 11 215 ex. of 122 dipterous species (in 28 families) were recorded. There are only eight families with four or more species (Scatopsidae 4, Hybotidae 7, Phoridae 6, Sepsidae 7, Sphaeroceridae 37, Carnidae 5, Anthomyiidae 6, Muscidae9; total 81). As it has been established formerly, dipterous populations and their assemblages on sheep droppings are extremely disproportional and show characteristics of pioneer colonizers. Corroborating former findings, it was found that sheep droppings have no autochthonous Diptera faunule. Almost no species was found which had not been included in Papp'

s (1992) table for dipterous species developing in pasture dung in Hungary. The list of species given in Table 3 of Papp (1993) for imago samples collected on sheep droppings from different parts of Hungary is nearly identical with the present one. The sphaerocerid species Coproica lugubris is the most characteristic species for sheep droppings in all the three sites (and it is also dominant unless the masses of C. vagans do not suppress it). The occurrence of the 122 species at the three sites are FVK 28, FV 2, F K 13, VK 18, F 12, V 12, K 37 species, respectively.