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Ability of coracidia to agglutination in homologous antiserum was established. The method of reaction of a direct agglutination of coracidia (RDAC) in the culture of alive larvae was described. When comparing the RDAC results in homologous and heterologous variants a dependence of the agglutination pattern on the degree of antiserum homology was established. On the example of RDAC of the cestodes Diphyllobothrium dendriticum and D. ditremum in polyvalent and species-specific antisera to D. dendriticum possibility was shown of RDAC usage in the studies on specific taxonomy of pseudophyllid cestodes.

Dynamics of the infection with pathogen trematodes of Brachyphallus crenatus (Rud., 1802) and Lecithaster gibbosus (Rud., 1802) in larvae and juvenile herring reared in experimental conditions and in those which were caught in the sea has been observed. Simultaneous infection of juvenile herring in natural environments and in experimental conditions has been noted. The parasitological examination of the material suggests the degree of natural mortality of larvae in the sea. The total rate of the juvenile herring infection in nature ranges from 22 to 92%.

Results of two large-scale surveys of Ixodes persulcatus distribution were compared. Surveys were conducted in a south taiga forest area in the Khabarovsk region two and ten years after a great fire. The direct inhibiting effect of the fire on the population of I. persulcatus was not continuous though apparent. By the moment of pyrogenic small forests formation on slash fires, i. e. during the period not exceeding 2—3 complete developmental cycles of I. persulcatus, the abundance and spatial structure of its population are restored completely.

Xenopsylla cheopis fleas infected parenterally with the virulent strain of plague microbe of gerbil variant preserved the agent to the end of their lives. In the body cavity the microbes retained their ability for reproduction which was, however, limited. During the first seven days after the infection the number of microbes slightly increased and later became stabilized. Its mean indices (xg) varied within the limits of 500 to 2000 microbe cells per 1 individual, maximum index rarely exceeded 30 000 microbe cells. Parenteral infection with plague agent did not affect essentially the longevity of fleas.

The complete list of species of fleas found on Alticola from Kirghizia is given. The adaptation of the fleas to definite altitude belts and their distribution in natural zones of the republic are considered. The fleas are arranged into four distinct territorial groupings: 1. Alpine fauna of eastern and central Kirghizia; 2. Complex of species from middle-mountain zone of the republic; 3. The fauna of fleas of south-western Kirghizia; 4. Faunistic complex of fleas from the Alpine zone of Central Alai. Results of seasonal observations on the dynamics of fleas abundance on Alticola are given.

The contact of Aedes aegypti mosquitoes with DDT one hour prior to the infectious feeding results in a slight decrease of their susceptibility to Plasmodium gallinaceum. The contact 24 hours prior to the infectious feeding does not affect the susceptibility of mosquitoes.

The paper presents the information (literary data and results of the collections from Lepus timidus L. in the northeast of the European part of the USSR) on the infection rate of three species of the genus Lepus. Haemodipsus lyriocephalus (Burm.) was found on L. timidus in northern taiga, its typical host being L. europaeus Pall. In Bolshezemelskaya tundra L. timidus is parasitized by the specific louse H. leporis Blag. A rare occurrence of lice on hares is due, to a great extent, to the host's mode of life. Egg and larvae of H. leporis are described. A key to species of the genus Haemodipsus, parasites of hares from the USSR, is given.

Experiments were conducted on the artificial infection of larvae of 8 species of bloodsucking mosquitoes (Aedes diantaeus, A. punctor, A. cinereus, A. flavescens, A. aegypti, Culex pipiens, Anopheles messeae, Anopheles atroparvus) with spores of Amblyospora opacita var. sibirica, Parathelohania costatus sp. n., P. obesa, P. anophelis. Negative results were obtained in all experiments.

The quantum of infection of Thelandros (Thelandros) freitasi, a gut parasite of Hemidactylus flaviviridis, has a positive bearing on the accumulation of glycogen reserves in the tissues of the host, i. e. ileum and large intestine during hibernation, and liver and large intestine during active feeding period.

Ultrastructure of capsule, hypoderma and subsurface musculature of the late acanthella Arhythmorhynchus petrochenkoi is described. The larval capsule is fully formed and near it single haemocytes of the host are found. Hypoderma does not contain fibrous material characteristic of adult proboscis worms. Secretion of the material from pore canals of the exterior hypodermal department is described. Cells of the subsurface musculature are polyphagous or associated with each other with cytoplasmatic processes. In addition to myofibrils fibres of connective tissue are formed in these cells that makes it possible to regard them as myofibroblasts. Differences in the structure of exodermis of presoma, anterior, middle and posterior metasomal departments were recorded.

The stock rise of elk, roe and boar up to 24.2, 20.8, and 29.3 thousand heads, respectively y increased their role as hosts of imaginal developmental stages of Ixodes ricinus and Dermacentor pictus. Elk plays an especially important role as the host of I. ricinus (the index of ticks abundance — 7.31, the index of saturation — 176.9). The indices of saturation of I. ricinus imagos on roe and boar are 96.5 and 73.1, respectively. D. pictus imagos parasitise, in general, boars (the index of ticks abundance — 3.06, the index of saturation — 81.7). The role of ruminants as hosts of I. ricinus larvae and nimphs is relatively small. Larvae and nimphs of D. pictus do not occur on ruminants.

Parasitic flies Nycteribia kolepatii and Penicillidia monoceros are first reported for the fauna of Estonia and Lithuania. The main hosts of the flies are Myotis daubentoni and M. dasycneme, respectively.

During the period of 1981—1982 9 central asiatic jackals were caught in the Chimkent region and «Kent-Bulak» area on the left bank of the Syr-Darja of the Kzyl-Orda region. In two jackals caught in the Kzyl-Orda region one species of coccidians of the genus Isospora was found. Oocysts of I. kzilordiniensis are oval without micropyle, the membrane is monolayer, smooth, greenish, 1.5 µ thick. The size of oocysts is 26.1—31.9x17.4—20.3 µ.

Sterlet parasite fauna in the Volga spur of Kuibyshev reservoir was studied in 1981—1982, over 20 years after its construction. 89 fishes from one to 12 years old were dissected, the total per cent of infection being 97.8. 12 species of parasites were found. Myxosporidia Zschokkella sturionis, ciliate Trichodina rectangli and nematode Camallanus lacustris are first recorded from sterlet. Analysis of sterlet parasite fauna in the Middle Volga and Kuibyshev reservoir has shown that 12 and 13 species of parasites were discovered there by different authors, respectively, only 5 species of parasites being common.

Lymnaea truncatula (Müller, 1774) is recorded as the first and second intermediate host of Echinostoma revolutum (Fröhlich, 1802) and Hypoderaeum conoideum (Bloch, 1782) Adults were obtained by the feeding of metacercariae to chickens.

A rare species of trematodes was found in the new host, the herring gull, in the northern part of the Caspian Sea. The single specimen differs from that described by Zhatkanbaeva (1967) in a number of characters.

Descriptions, differential diagnoses and figures of new species of trematodes of the family Didymozoidae from fishes of north-western Pacific are given. One species, Didymozoon shimai sp. n., was found between rays of the thoracic fin of Brama japonica; the other, Namatobothrioides gomasabae sp. n., was found on oesophagus and swim bladder of Scomber japonicus.

In the abomasum of domestic goat of Uzbekistan there were found ostertagiae which differ distinctly from earlier described species of the family Trichostrongylidae in size and structure of spicules and in the morphology of genital conus. The new species Ostertagia sogdiana sp. n. (fam. Trichostrongylidae) is described.

Two new species of the genus Pararotylenchus were found in the rhyzosphere of Pinus silvestris L. in nurseries of the Ushumunsk forestry of the Amur region. P. pernoxius sp. n. differs from the close species P. megastylus and P. belli by smaller sizes of the body and stylet and short procorpus of oesophagus. P. rarus sp. n. differs from the close species P. blothorotylus and P. colocaudatus by smaller sizes of the body and stylet, spherical spermatheca and longer tail. Key to the species of the genus is given.

A new species of mermithids is described using one male. The specimens differs from all other mermithids by the presence of gubernaculum. On the basis of this character the species is separated into a distinct genus. The male was found in the Saratov region, in the forest soil.

Summary is absent.

Summary is absent.