Dr. Kassai Tibor szerk.: Parasitologia Hungarica 2. (Budapest, 1969)

Further evaluation and illustration are derived from two other Tables. Table 5 shows the frequency of occurrences (combined cases of single and common occurrences) per host of the flea species. Table 6 displays the frequency of common occurrences of the individual flea species. In the course of my investigations the following forms of common occurrences of flea species were established. Flea common occurrences on mouse species It was most frequently on mouse species that coexistence of several flea species was found. This is probably accounted for net only because the great majority of collected host individuals belonged to this group but also because of the well-known fact that most flea species can be found on members of the family Muridae in Hungary. The majority of flea species living on our mice belong to the genus Ctenophthalmus

, of which Ct

. agyrtes (

C.a.bosnicus Wagner; C.a

.eurous Jordan et Rothschild; Ca. kleinschmidtianus Peus; Ca. peusianus Rosiczky) occur in most populations and in rather well defined geographical areas, as was demonstrated in an earlier paper (SMIT and SZABÓ, 1967). However, other species of the genus also occurred, viz. Cassi- milis assimilis (Taschenberg), Ccongener congener Rothschild, and. Csolutus solutus Jordan et Rothschild. Together with those species, the Hungarian members of the genera Hystrichopsylla

, Leptopsylla

, Monopsyllus

, Nosopsyllus

, Palaeopsylla

, Peromysco- psylla

, and Rhadinopsylla occurred more rarely. The two most frequent populations (on 9 and 11 occasions) also occurred on mice (serial numbers 23 and 34). Both species are rather local, being found in the Bakony Mts* and in the neighbourhood of the village őriszentpéter. Another interesting fact is that one instance of both common occurrences was observed in the environs of the village Zajk, Comitat Zala. « Mountains