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The spontaneous infection of Ornithodoros tartakovskyi with Borrelia latyschevi was studied by means of infective feeding on white mice and microscopy of internal organs of the vector. Investigations were carried out in 23 settlements of Middle Asia and Kazakhstan. Ticks were infected with the agent independently of the geographic location of their habitats provided that they fed on rodents or other warmblooded susceptible to B. latyschevi animals. Mostly often infected ticks were found in colonies of the great gerbil where the spontaneous infection of some series varied from 17 to 59.7%. The transition of ticks to bloodsucking on Testudo horsfieldi leads to the reduction of their infection or complete release from spirochaetes due to the breakage in thechainof the agent's transmission.

An attempt was made to typify the breeding places of bloodsucking midges depending on the hydrological regime. Hydrological peculiarities of the flood-plain and valley of the Seversky Donez, inter-river spacing and coast of the Azov Sea were taken as an example. The flood-plain and valley differ but insignificantly in the specific composition (Leptoconops borealis occurs only in the valley) and the abundance of midges (more abundant in the flood-plain) while the inter-river spacing is characterized by a poor specific composition and low number of midges. That is explained by the abundance and great variety of breeding places in the flood-plain and valley and their poverty in the inter-river spacing. The comparison of two seasons (1969 and 1970) in the flood-plain and valley has shown a great influence of flood water which caused outbreaks of the mass increase of midges (especially C. pulicaris) and the death of the main part of the population of С. vexans, С. maritimus and Leptoconops borealis. In the inter-river spacing fluctuations in the specific composition and quantity are negligible. Flooded areas of the Azov Sea Coast are the main breeding place of mass development of the nubeculosus group and Leptoconops borealis.

The description of preimaginal phases of the bloodsucking midge (Lasiohelea sibirica Bujan.) is given. Midges were reared on the artificial medium (Saunders, 1959) under laboratory conditions. The larva of L. sibirica proved to be very close to larvae of non-bloodsucking species of this subgenus described by Saunders (1964) and Le Chan and Roux (1970) especially to those of L. cornuta Saund., L. quasicornuta Saund., L. uncuspromissa Chan and Le Roux. The larva of L. sibirica differs by the number of hooks on the thoracic pseudopodium and anal segment of the body, the presence of ocular setae on the head, the shape of thoracic pseudopodium and by other characters.

12 species of mosquitoes were recorded from the upper course of the Jana river as follows: Culiseta alaskaensis Ludl., Aedes cantans Mg., A. cataphylla Dyar, A. communis Deg., A. excrucians Walk., A. fitchii Felt et Young, A. flavescens Müll., A. hexodontus Dyar, A. impiger Walk., A. nigripes Zett., A. pullatus Coq., A. punctor Kirby. A. hexodontus was most abundant. Breeding places, seasonal variations in abundance and daily activity of the above species were studied. Observations were undertaken on the conditions of swarming of two species.

Biology of two bloodsucking species of black flies (Titanopteryx maculata and Schonbaueria pusilla) was studied under conditions prevailing in Novosibirsk. Their breeding places, flight periods, age composition, life duration and the autogamy of females were established.

During swarming of gad flies mass aggregations of males of Hybomitra lundbecki Lyneb. and H. montana Mg. were regularly observed. Weather conditions favouring the swarming of each species were studied. Observations were carried out on the mating of H. lundbecki and H. montana.

The female of Ceratophyllus styx riparius J. et R. fixed in copula was found to possess two spermathecae. The ductus obturatorius and right spermatheca are as long as those in normal individuals; the ductus spermathecae is somewhat shorter and bifurcates in the apical third into a short branch extending to a smaller (left) spermatheca and a longer one terminating with the right spermatheca.

A new species of the genus Parasymphylodora, P. parasquamosa sp. n., is described from the intestine of Rutilus rutilus caspicus, R. rutilus fluviatilis, Leuciscus idus, Blicca bjorkna, Abramis brama, and A. ballerus. The species differs from all other representatives of this genus in the location of yolk glands in the hind third of the body and in other characters. The larva of the species has been described which was previously taken for Cercariaeum of the type "parasquamosum". The diagnosis of the genus is given.

Two new species of trematodes are described from fishes of the family Gobiidae of the Black Sea. Lecithochirium proterorhinus was found in hepatic ducts of Proterorhinus marmoratus caught off the coast near Sevastopol. L. ophiocephalus parasitizes the intestine of Gobius ophiocephalus which occurs in Sevastopol bays and the Kerch Strait.

Metacercariae of diplostomatids were frequently recorded from fishes of Kazakhstan and were found to belong to several distinct species. The species belonging of metacercariae of two species of the genus Diplostomum was established experimentally: D. pusillum from eyes of Nemachilus strauchi and D. phoxini from the brain of Phoxinus tschekanowskii.

Pathogenic effect of larvae of ten trematode species on Viviparus viviparus (L., 1758) was studied by means of hystological and hystochemical methods. Sexual dimorphism in the localization of parasites and fifferences in the extensiveness of invasion of males and females were established. Serious hystopathological changes occurring in infected organs as well as breakage in the content of various substances of protein, carbohydrate and adipose nature are reported herein.

There was found a specimen of the dwarf tapeworm with multiple anomaly: 1. lateral branching from the strobila consisting of ten to twelve proglottids, 2. inversional position of groups of proglottids in five places of the strobila with areas of non-differentiated tissue.

A new nematode, Philometra baueri sp. n., was found under the skin between rays of the caudal fin of Oreoleuciscus potanini caught in Verkh-Tambasu Lake, the Mountain Altai. The female of Philometra is described. The new species is most close in some characters to Ph. ovata and Ph. oreoleucisci.

Heterodera artemisiae sp. n. was found on the root system of Artemisia rubripes N. in the Primorje Territory. The species is close to the group of heteroderids with a rounded posterior end, without a protruding anal-vulvar conus. It differs from allied species in a plant-host and in a number of morphological characters in the structure of females and larvae.

420 coccidiosis-free 20-, 40- and 60 day-old chickens were examined in respect to variations in total, residual and protein liver nitrogen by their experimental infection with two species of Coccidia: Eimeria tenella and E. mitis. It was established that the content of total, residual and protein liver nitrogen decreases with the development of the invasion and the degree of changes depends on the host age and species of Coccidia.

In cultivating the tissue of the midgut of honey-bee infected with Nosema apis and extracted in 24, 48, 72 and 120 hours after the infection of insects the parasite's developmental stages from the hatching of amoebula to the spora formation were followed. The increase in the number of host's cells in vitro affected by N. apis was observed as compared to cells of the midgut in vivo. A twofold increase in the duration of the parasite's developmental cycle in vitro took place. The possibility of using the cultivation method of N. apis in vitro is discussed.

The paper gives for the first time data on the existence of natural nidi of zoonose cutaneous leishmaniosis over the territory of the Karakalpak Kizil-Kum and Ust-Urt in the Karakalpak ASSR.

Studies were carried out of the distribution of trichomonads (Trichomonas elongata Steinberg, 1862) in the oral cavity of healthy persons and of those possessing various signs of diseases of the oral cavity. The most appropriate medium and lethal concentrations of some officinal substances for a cultivation of trichomonads in vitro were established. The active part of trichomonads in maintaining the inflammatory process in paradont is suggested that has been confirmed by results of medical treatment of sick persons with trichopol.

The flight range of midges from their breeding places was studied in Turkmenia by their catching to glue paper attached to an animal's belly (asses, horses) for ten minutes. When 1000 m apart from the breeding place a twentyfold decrease in the number of midges attacking animals was observed; when 2000 m apart only solitary midges attacked animals, three midges being taken from one animal per ten minutes.

The infection of carp with acanthocephals Neoechinorhynchus rutili occurs normally in spring. Acanthocephals are localized throughout the whole intestine. That is why antihelminthic introduced by the probe does not affect all parasites. Good results were obtained when fishes were given tetraphinol at 1 mg per 1 kg of fish weight.

According to the research of Fain (1970) and study of type Listrophorus validus Banks from Harward University collection (USA) Listrophorus grandior H. Dub. should be treated as synonym of Listrophorus validus Banks. The new name Listrophorus faini H. Dub. sp. n. — is introduced for the species, earlier described by the author (H. Dubinina, 1967) as L. validus.

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Summary is absent.

Summary is absent.