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On the basis of the analysis of parasite fauna of fishes from Highland Asiatic subregion, which according to Berg 1949 includes Balkhash, Tibet, Tarim and West Mongolian provinces, their similarities and differences are evaluated. Parasitological data show that the Balkhash province should be referred to the Mediterranean subregion. The West Mongolian province has distinct palaearctic characters. Therefore, the Highland Asiatic subregion includes only the Tibet and Tarim provinces.

Tetramorphism of trypomastigote forms has been discovered in the blood stream of mice infected with Trypanosoma cruzi, that is С slender, С middle, S slender, S middle and forms intermediate between С and S. Regular changes of forms have been observed in the course of the infection. In the middle of the process, at the moment of maximum destruction of parasites affected by immunosystems of the host, C-forms prevailing on the whole substantially give place to S-forms, slender variants being replaced by middle ones within each of them. Polymorphism in the bloodstream of the vertebrate host is the general property of all trypanosomes, with their common biological value: immunological adaptation to parasitism in the blood and preadaptation to the continuation of the life cycle in the invertebrate host.

The nematodes of "Xiphinema americanum" group according to the form and size of their tail and anterior regions, indexes c¹ and J were subdivided into three different subgroups: "X. pachtaicum", "X. citricolum" and "X. brevicolle". The species X. variabile Heyns, 1966 was excluded from "X. americanum" group. As suggested by Cohn and Sher (1972) according to the form and size of the tail this species stands closer to "X. elongatum" group. X. inaequale is regarded as a synonym of X. neoamericanum. The new species X. paramonovi Romanenko, 1981 found in the USSR was included into "X. americanum" groups. Additional information is provided on morphology, biometrics and geographical occurrence of this species (X. paramonovi). In the USSR the species X. brevicolle, X. pachtaicum, X. paramonovi are common representatives of "X. americanum" group.

Keys to four known species of the genus Dermacentor from Siberia and Far East of the USSR are based on their nymphs and larvae. Analysis of laboratory cultures served as a basis for distinguishing differential characters of preimaginal phases. Stability of characters in the distribution area of each species was verified on natural material from many geographical localities. A wide range of structures was used for species identification as follows: peculiarities of scutum, peritreme, anal valve, organs of gnathosoma, chaetotaxy and morphometrical characteristics and ratios. Keys can be used for identification species from the European part of the USSR and north-eastern Kazakhstan.

The main distant receptor organ of H. criceti, situated on the tarsus of each first leg, was studied by scanning and transmitting electron microscopy. The organ contains 6 types of sensilla, including 4 distant ones (two types of olfactory sensilla, differing in wall thickness, and 2 types of probable chemo-thermosensitive sensilla, posessing different double-walled hairs), and also taste organs of common structure and microchaeta. Cilia of all the sensilla contain 13 pairs of peripheral fibers. Comparative analysis of fine structure of distant sensilla in bloodsucking insects, ticks and mites made it possible to show, that blood-sucking gamasids and ticks posses similar number of homologous sensillar types, that formed on a common ground as the specific adaptation to blood-sucking.

Only 3 sandfly species were recorded from Mozambique before the present investigation. In March 1933 saveral sandflies were collected on oiled paper in three holes and rodent burrows near the town of Tete. These are Sergentomyia (Sergentomyia) congolensis (Bequaert et Walravens), 1930 (males and females), S. (S.) teteica sp. n. (female and male) and S. sp. (a male presumably belonging to the subgenus Capsnsomyia). Their descriptions are given and taxonomic status is discussed.

A case of reproduction of Ichthyophthirius multifiliis in the superficial tissues of larvae and fry of Amur wild carp is described. At a temperature of water from 28 to 29° trophonts of Ichthyophthirius encysted on fishes. Inside cysts repeated cell division occurred but this process did not result in swarm spores formation. Later on with the increase of temperature to 29.5—31.5° cysts degenerated.

A description of the ectoparasitic ciliate of the channel catfish Ictalurus punctatus, Ambiphrya ameiuri, is given. Various medicinal preparations were tested in order to control A. ameiuri. Potassium permanganate in the dose of 10 g/m³ for 1 hour is most effective.

Diplozoids are characterized by the concrescence of two young individuals; their further existence is possible only in concrescent state. Prerequisites for this were as follows: the absence of vaginal duct in ancestors, fertilization through uterus, the presence of male genital sucker homologous to ventral sucker of diporps and sclerotized copulative organ. Withdrawal of eggs through uterus became impossible after the concrescence in the genital atrium area. In this connection its excretory orifice displaced in diplozoids laterally. During the process of concrescence diporpa seizes with its male genital sucker the dorsal and not the ventral side of the body of another individual, on which there is a special tubercle. As a consequence of diporps' fusion occur reanlage of uterine duct, formation of vaginalike duct and connection of a number of systems of organs. Octomacrids, as well as diplozoids, parasitize gills of freshwater fishes. These monogeneans have a male genital sucker, a sclerotized copulative organ and lack vaginal duct. In case of copulation the fertilization is carried out through uterus. The authors suggest that octomacrids and diplozoids had the same ancestor close morphologically to present-day octomacrids.

Larvae of two species oi amabiliids Schistotaenia colymba and Tatria dubininae were first discovered in dragon flies of Ischnura elegans (0.71%) and Agrion hastulatum (0.93%) from water bodies of Ural (West Kazakhstan) and Tzelinograd (Central Kazakhstan) districts. Cysticercoids are described. The above species of cestodes are new for the fauna of Kazakhstan.

Effect of age of pike on the length of antennae in Ergasilus sieboldi is discussed. It is shown that the difference in the length of antennae in egrasilids taken from fishes of the age of 2+ and 3+ is statistically unreliable. At the same time the difference in the length of antennae in ergasilids from pikes of 3+, 4+ and 5+ is statistically reliable. The growth rate of antennae in ergasilids from a pike of 5+ is higher than that in individuals from a pike of 4+. The increase in antennae length in ergasilids from pikes of older ages is associated with the increase in size of gill leaflets with fish age.

A description of morphology of preimaginal phases of development of Hybomitra tarandina L. unknown from literary data and that of pupa of H. lurida Flln. described earlier by Teskey (1969) for North America are given.

When rearing fleas under laboratory conditions maximum productivity was observed in breeding cages with 100 fleas (80 females and 20 males). When the number of fleas was increased to 250 and 500 specimens the progeny decreased in number. At the ratio between males and females of 1 : 2 and 1 : 4 the productivity of fleas virtually did not change. Of all species studied fleas of X. cheopis are characterized by most high productivity. In all months of the year the average number of hatched fleas per one cage was 13—15 thou. of X. cheopis, 7—8 thou. of C. tesquorum, 1.5—2.5 thou. of X. skrjabini, and 3—4 thou. of Ct. wladimiri.

In Badkhyz State Reserve the following species of bot flies are parasitic in kulans: Gastrophilus pecorum, G. nasalis, G. intestinalis, G. haemorrhoidalis, G. inermis and G. nigricornis, Rhinoestrus latifrons, Rh. purpureus and Rh. usbekistanicus, G. nigricornis and Rh. usbekistanicus were not found on kulans from Barsakelmes State Reserve. In the alimentary canal of two zebras, which were fed with hay stored up in the territory of stud farm, there were found larvae of G. pecorum. In the regions of mass breeding of kulans they proved to be affected with gastrophilosis and rhynestrosis at the infection rate of 88 to 257 and 34 to 100 larvae, respectively.

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Summary is absent.