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90 species of bloodsucking Diptera including 21 species of mosquitoes, 41 species of black flies, 7 species of midges and 17 species of gad flies were recorded from central regions of Magadan district (the middle course of the Kolyma, Omolon and Anadyr rivers). Data are provided on phenology, seasonal variations in the number, biotopic distribution, specific number of mass species and some components of bloodsucking flies complex.

A key to genera and subgenera of Culicidae of the Soviet Union is accompanied by-brief notes on difficulties which can arise in their identification. A table containing principal qualitative indices obtained during studies of 430 preparations of 75 mosquito species is provided.

The paper contains description of female, male, larva and pupa of Culucoides kirgizicus sp. nov. with colourless wings. Larvae were collected in marsh of wooded zone of the mountain ridges Kungey-Alatau and Terskey-Alatau (Central Tien Shan). C. kirgizicus resembles C. lailae Khalaf and C. pamiricus Zhogolev, but has distinctive differences.

Integument of first-stage larvae of Hypoderma bovis possesses a certain degree of permeability for amino acids (glycine, leucine, methionine) in particular. The character of accumulation of radioactive tag suggests the selectivity of distribution of the above amino acids. The midgut content of first-stage larvae possesses cumulative properties.

Flies of Oestrus ovis L. were labelled with paint solution (fluoresceine, 0.2 g; caustic soda, 0.1 g; polyvinyl alcohol 0.5 gper 100 ml of water) and released in nature. Six experiments were conducted and it was established that flies of O. ovis released near sheep-folds did not fly away to neighbouring ones where flocks of sheep were placed. Insects released on pastures were detected in neighbouring sheep-folds at a distance up to 6 km.

The paper reports the results of experimental studies undertaken to determine the life cycle of Ceratixodes putus Pick.-Cambr. under the conditions of seashore bird colonies of East Murman. Depending on weather conditions and microclimate of various parts of bird colonies the life cycle can last from 4 to 7 years. Normally ticks hibernate in hungry condition and with the first spring rise in temperature are ready to bloodsucking. Ticks, which in cold years did not moult before the fall of temperature, undergo great mortality in winter. In such years the preservation of population on a high level is attained on account of good preservation of eggs which can develop within several years without considerable losses.

Two new species of ostracods are described belonging to new genera of the subfamily Paradoxostomatinae, Echinositus strongylocentroti Schornikov, gen. et sp. n. and Echinophilus semilunaris Schornikov, gen. et sp. n., ectoparasites of sea urchins from the northwestern coast of the Pacific. The adaptation ways of ostracods to ectoparasitism are discussed.

9 new species of the genus Diplozoon Nordmann, 1832 collected from fishes of Azerbaijan are established as follows: Diplozoon kurensis sp. n. from Barbus lacerta cyri; D. mingetschauricum sp. n. from Barbus capita; D. varicorhini sp. n. from Varicorhinus capoeta sevangi; D. chazaricum sp. n. from Rutilus frisii kutum; D. schulmani sp. n. from Alburnoides bipunctatus eichwaldi; D. sapa sp. n. from Abramis sapa bergi; D. persicum sp. n. from Vimba vimba persicus; D. kuthkaschenicum sp. n. from Alburnus filippii, A. charusini hohenackeri; D. agdamicum sp. n. from Leuciscum cephalus orientalis.

Comparative studies of cestodes from vertebrates of different classes have revealed the presence of proteolytic activity in homogenates of Moniezia expansa, Diphyllobothrium dendriticum, Triaenophorus nodulosus, Bothriocephalus gowkongensis, Diphyllobothrium latum. It was found that the fermentative activity of helminths is adapted to the intensity of host's metabolism. The highest proteolitic activity has been reported from homogenates of cestodes from birds, the lowest one — from homogenates of cestodes of fishes.

The movements of Hymenolepis nana in vitro and the effect of some substances with mediatory qualities (acetylcholin, adrenalin, serotonin, histamine) on the speed of movements and detachment of cestodes from the intestinal wall were studied. It is shown that the speed of the movements is inversily proportional to the body size of cestodes. Young and adult cestodes possess different threshold responces to pharmacological substances, various dilutions of which affect worms in different ways.

The paper describes the parasite fauna of Schizothorax intermedins McCl. and Schizopygopsis stoliczkai St. from Lake Sarez (the central part of Pamirs) and its peculiarities in connection with ecological conditions of hosts' habitats.

15 strains of Entamoeba histolytica were studied for their virulence to animals irradiated and non-irradiated with X-rays. It was established that after irradiation the infection rate of animals with dysentery Amoebida considerably increases as well as the virulence of E. histolytica.

Observations made while infecting natural populations of Aedes caspius caspius (Pall.) Edw. with the microsporidians Thelohania opacita Kudo, 1922 have shown that mostly females develop from larvae of infected populations. In uninfected populations the ratio between males and females was close to 1:1 while in infected ones the ratio was 1:2.5 to 8, respectively. The higher was the infection with microsporidians the greater was the percentage of emerging females. Such sex ratio is due primarily to higher mortality of males at the larval phase.

In May of 1970 in the Mary ASSR there were found larvae of Aedes excrucians infected with microsporidians. The parasite is localized in the host's fat body and haemolymph. Microsporidians are able to form various numbers of spores (three to eight) in one sporont, sizes of spores varying from 6.4X5.6 to 9.6X8.2 mk. Studies of taxonomic characters suggest that it is either a new species or one of the forms of Thelohania opacita.

Observations on parasitism of Ixodes eldaricus Djap., 1950 on rodents were conducted in 1969—1970 in western Kopetdag. 349 larvae and 8 nymphs were collected from wild rodents of mountain fauna. 7 species of rodents (Apodemus sylvaticus, Calomyscus bailvardi, Mus musculus, Cricetulus migratorius, Meriones persicus, Crocidura persica, Nesokia indica) are first reported as hosts of I. eldaricus.

Males and females of Culicoides pamiricus sp. n. with colourless wings are described. They were collected in the West Pamirs.

The paper contains a description of two new species of the genus Gyrodactylus from Perccottus glehnii from the Amur River near Khabarovsk and Leninsk. G. perccotti sp. n. is close to G. australis Gussev, 1967 in the shape of anchors but differs from it in the shape of marginal hooks. G. glehnii sp. nov. is most close to G. perccotti but differs from the latter in the shape and size of marginal hooks, size and some other details of the shape of anchor complex.

Female of the new species of nematodes Aphelenchoides spicomucronatus sp. n., is described from the root system of Glycine hispida from the Amur region.

In order to ascertain the possibilities to use Goccidia for biological control of house mice studies were undertaken of virulent properties of Eimeria sp. isolated from laboratory mice (Mus musculus), line CG57BR. The parasites in doses from 30000 to 50000 oocysts were found to cause death of experimental animals. Thus, it was established that Eimeria sp. is virulent to house mice and can be used for biological control of these rodents.

Architectonic of spores, their shape, size and some other details of the structure are used for determination of species belonging and taxonomic status of mixosporidians. Therefore, the preparation of glycerine-gelatine slides (without preliminary fixation) with subsequent employment of phase-contrast microscopy should be considered the most advantageous technique of fixation and treatment of mixosporidians for their determination. All other methods can be used as additional ones.

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