Dr. Murai Éva szerk.: Parasitologia Hungarica 22. (Budapest, 1989)

Individual numbers recorded in Table 1 show the dominance of 3 or 4 species. Since these species hatched in far greater numbers than the others, we cannot conclude from the SHANNON-WIENER diversity index and values of evenness to the whole of dipterous community. Accordingly, a survey with far more samples would be necessary. Rearing of three specimens of Ischiolepta scabricula (Haliday, 1836) is faunistlcally interesting since this species was only known from the Hortobágy in Hungary. Table 3. Muscid filth files of veterinary importance emerging from cow barn samples Date of sampling 01 June 1' 14 July i 15 August Mark of barn A B C A B C A B C Number of samples 5 5 5 3 3 3 5 5 5 Fly species Fannia canicularis 1 9 5 2 2 3 6 Musca domestica 4 12 73 2 4 20 Stomoxys calcitrans 1 18 104 72 60 Potential fly breeding sites in the calf hoube A strip 20 centimetres wide running along the wall of boxes includes the most important breeding sites. Besides Musca domestica and Stomoxys calcitrans maggotb were developing in notable quantities on a strip-like site under the hayracks (about 1 m

2 surface per box), Finally, there were other potential breeding sites under each self-drinker (maximum 0.1 m

2 surface, mostly for Fannia canicularis

). All breeding sites cover 1.8 m

2 In each box, thus 18 m

2 in the stable, i.e. 3.7 percent of all stable floor surface. There was about 70 kg of litter on the actual potential fly breeding sites according to a calculation based on the mean weight of samples. Flies of the cow barns and their breeding sites Twelve dipterous species had been found by rearing from six samples taken in the same place (PAPP 1975). Larval development of two species (

Sepsis fulgens Meigen, 1826 and Sepsis violacea was not proved. PAPP (1975) had caught 25 dipterous species by sweep net collection: of them Chironomtdae Indet

., Halldayina spinipennis (Haliday, 1836), Ulidia erythrophthalma Meigen, 1826, Sepsis blflexuosa Stróbl, 1893, Sepsis fulgens

, Elachisoma pilosum Duda, 1924), Leptocera curvinervis (Stenhammar, 1854) (

=nlgra Olivier, 1813) were not found now. In June the breeding sites were unfavourable being too wet for Musca domestica larval instars: accordingly, Fannia canicularis emerged from six samples. In July and August species requiring higher humidity predominated again as a consequence of green alfalfa feed. Larval development of Stomoxys calcitrans was proved In this period only; stable fly was the second in dominance in the samples from August. Consequently, it can be established that stable fly can maintain its population not only under a desiccation of breeding sites (found in the calf house) but also in moist places. Maggots of Eristalis tenax (Linnaeus, 1758) also breed in cesspool as well as Syrltta pipiens (Linnaeus, 1758) seems to find op-