Dr. Kassai Tibor szerk.: Parasitologia Hungarica 2. (Budapest, 1969)
their fleaa should he discussed together, since in an investigation of a locality (Hajdubagos ), where the two host species occur together the fleas of the gopher can frequently he found on the mole-rat also, either alone or together with other flea species. Ctenophthalmus caucasicus (Taschenberg) is clearly host specific to the mole-rat; it occurred in all observed cases together with the flea species of the gopher, and in one case with Ctenophthalmus congener congener Rothschild. The fleas of the gopher are Citellophilus martioni (Wagner et Ioff), C. simplex (Wagner), and Ctenophthalmus orientális (Wagner). In the eight cases of common occurrences found on the gopher one or other of these species have, with one exception, always been present .Besides the foregoing species 3 other fleas were found, each on one occasion. They were Ceratophyllus tribulis (Jordan) presumably transferred to the gopher from a bird nesting on the ground. Ctenophthalmus assimilis assimilis (Taschenberg), and Nosopsyllus fasciatus (Bosc).Two varieties of common occurrence (serial numbers 17 and 18) were found in three cases each. It deserves special mention that whereas the fleas of the gopher very frequently occur on the mole-rat, the characteristic flea of the mole-rat has never been observed on a gopher occupying the same locality and habitat. Plea common occurrences on the mole I found six kinds of flea populations on the mole with the host specific Palaeopsylla similis simili3 Dampf appearing in most of them. In three cases Ctenophthalmus bisoctodentatus bisocto- dentatus Kolenati was also observed - previously collected only from the mole in Hungary - so that it can be regarded with some justification aa host specific. Besides the two species mentioned above, Ctenophthalmus agy rte s bosnicus Wagner, Ct.assi milis assimilis (Taschenberg), Ct .orientális (Wagner), Dorato- psylla dasyonema dasycnema (Rothschild), Nosopsyllus fasciatus (Bosc), Palaeopsylla kohauti Dampf , and, P.soricis rosiczkyi Smit were also collected in one case each. Unfortunately, I have not
