Dr. Murai Éva szerk.: Parasitologia Hungarica 22. (Budapest, 1989)
where s = the number of species forming the group surveyed, p.= relative frequency of species number 1 (0<p^ 1) The evenness of the diversity was calculated by the simple formule of e = -L s In S . RESULTS Results of fly rearings from the samples taken are shown In Tables 1 and 2. Altogether 6281 specimens of 38 dipterous species were found. Specimens of 21 fly species emerged in the calf house and those of 32 species emerged in the three cow barns. The number of specimens belonging to species of medical and veterinary importance in the cow barn samples are displayed separately In Table 3. DISCUSSION It can be established that the majority of the dipterous species found is obligate coprophagous. However, Immature stages of species of medial and veterinary Importance occurred in both stable types. Flies of the calf house and their breeding sites Occurrence of eight dipterous species detected by rearing from three manure samples taken in the same building from May to August, 1973 (PAPP 1975). Two of these species, Drosophila repleta Wollaston, 1858 and Sepsis vi place a Meigen, 1826, were not found now. Sweep net collections performed that time had yielded 13 dipterous species. Larval development of seven of them ( Culicidae indet ., Dolichopodidae indet ., Phoridae indet ., Spelobla btfrons (Stenhammar 1854), Telomerina flavipes (Meigen, 1830), Pullimosina he- teroneura (Haliday 1836) and Drosophila repleta) was not proved. Data obtained from samples taken on the 1st of June (see Table 1) show that Musca domes- ' tica Linnaeus, 1758 larvae prefer places where the temperature is higher. A few specimens of Musca domestica hatched from moist samples (taken near the self-drinkers) but Fannia canlcularis (Linnaeus, 1761) larvae definitely require such conditions. A decrease in the individual number of housefly per sample in August can be explained by the desiccation of breeding sites. Housefly emergence did not change notably in samples taken * from permanently wet areas. Stomoxys calcitrans (Linnaeus, 1758) occurred in the company of the housefly only, except in two samples. Our conclusion is that these two species need similar development conditions or rather a part of the breeding sites of Musca domestica is also optimal for the larvae of Stomoxys calcitrans . The best places for larval instars of stable fly (usually mouldy litter mixed with feed particles) are small as compared to the whole area of the potential fly breeding sites: therefore, it is difficult to locate them exactly. Consequently, the reliable position of Stomoxys calcitrans in the dipterous community could not be shown by individual numbers per sample. Desiccation of the floor does not seem to disturb its multiplication.
