Dr. Kassai Tibor - Dr. Murai Éva szerk.: Parasitologia Hungarica 6. (Budapest, 1973)

standing the fact that the environmental factors - primarly climatic conditions - hardly differ in the two areas. Concerning the reason of the greatly differing specific numbers in the two regions the author presumes, that owing to the partial or complete inundation of both territories only fleas of hosts surviving the critical times can also survive, whereas the majority, being in underground passages and nests, perishes. At the Kisbalaton, the possibilities of resettling of the populations are good because the investigated areas directly adjoin extensive uncultivated

,and only partly cultivated, territories. Around Lake Velence this possibility is considerably delimited because the immediate neighbourhood of the study area is either under agricultural cultivation or about to densely built settlements. The survival of host and flea species depends on those outlasting inundations, especially the shrews. Irodalom Országos Meteorológiai Intézet: Magyarország éghajlati atlasza. Budapest, pp. 20+78. I960. SMIT, P. - SZABÓ,I

. : The distribution of subspecies of Ctenophthalmus agyrtes in Hungary (Siphonaptera: Hystrichopsyllidae). - Ann. Hist.-nat. Mus. Hat. Hung., 5_9> 345-351. 1967. SZABÓ, I.: A magyarországi emlősállatok bolhái. - Állatt. Közlem. 5_4_. 151-160. 1967. SZABÓ, I.: On the coexsistence of fleas (Siphonaptera) on mammals in Hungary. - Parasit. Hung. 2. 79-118. 1969. SZABÓ, I.: A hazai bolhafajok és gazdaállataik viszonyai. - Állatt. Közlem. 5_9 - 136-148. 1972. Érkezett: 1973- febr. 15. SZABÓ, I. Természettudományi Múzeum Állattára 1088 Budapest, Baross u. 13-