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Two species of monogeneans, Osphyobothrus bychowskyi Khoche et Chauhan, 1969 and O. multivitellatus sp. n., were found on gills of fishes of the genus Saurida from the Indian Ocean and the South-Chinese Sea. The new species is characterized by well developed yolkglands which occupy the whole intracaecal space and by certain peculiarities in the structure of the adhesive clamps. All members of the genus Osphyobothrus possess the intestine which is formed by a net of branching and fusing canals. The adhesive clamps have a well developed membrane in the anterior valve of the clamp.

Two new species, Calicotyle rosinae and Calicotyle sjegi, from oviducts of Raja brachyurops differ from other members of the family Monocotylidae in the shape of the copulative organ, sizes of the body and hooks of the haptor.

The paper contains descriptions of three new species of monogeneans from fishes of the Pyange river (the Pamirs): Dactylogyrus irinae sp. n., D. schizopygopsis sp. n. from gills of Schizopygopsis stoliczkai, and D. assimovi sp. n. from gills of Nemachilus stoliczkai and N. stoliczkai lacus nigri.

The paper presents a description of new species of Trematoda and Monogenoidea. The material was collected in Zarubino and Posjet settlements (the Posjet Bay, the Sea of Japan) in 1959—1960. Trematode Monorchis japonicus Zhukov sp. n. from the intestine of Hyporhamphus sayori (Temm. et Schleg.) were found in both settlements, Decemtestis manteri Zhukov sp. n. from the intestine of Kareius hicoloratus (Bas.) — in Posjet settlement. Lamellodiscus spari Zhukov sp. n. from gills of Sparus macrocephalus czerskii Berg, Gyrodactylus mugili Zhukov sp. n. from gills of Mugil so-iuy Bas., and Gyrodactyloides poljanskii Zhukov sp. n. from gills of Engraulus japonicus (Schleg.) were found in Posjet settlement.

Prinosoma zachwatkini sp. n. (the fam. Echinostomatidae) was found in the intestine of the water rail, little crake and common snipe in the basin of the upper Dniester in June to September, 1963. The new species differs from another species of this genus, P. serratum, in considerably smaller sizes of the body, the presence of serriform cuticular notches on the ventral side, and a smaller number of spines on the adoral disk.

A new species of trematodes of the family Didymozoidae was found in gonads of Scomber australasicus. Nematobothrioides australiensis Nikolaeva et Korotaeva sp. n. is a second species of this genus. It seems that the puberty of trematodes is associated with the period of host spawning.

A new species of acanthocephals, Bolbosoma tuberculata sp. n., is described from the intestine of Bryde's whale, sei whale and cachalot caught in South Atlantic and Indian Ocean. The length of the holotype (male) is 29 mm, the greatest width 2.9 mm. Hooks on the proboscis are arranged in 25 to 26 (seldom 24 to 27) rows, 8 (sometimes 7) hooks in each row. The new species differs from other species of this genus by sizes of the body, the number of hooks on the proboscis, and by the peculiarities of their attachment.

The common black ant, Lasius niger L., was found to be infected with the mermitid, Allomermis lasiusi sp. n. for the first time in the USSR (the Leningrad region). It differs from the type species, A. trichotopson Steiner, 1925, in a larger size, the structure of chordae, location of the mouth in front of cephalic papilles, the opening of amphids being on the level of papilles. The infected ant is twice as large as normal ones.

A new species, Tylenchorhynchus sobolevi sp. n. (Tylenchoidea Chitwood et Ch., 1937), was found in stems of cucumbers from the Ussurian district. The species differs from other species of this genus in the length of genital tubes and the number of stripes in lateral fields (10 to 12).

On the islands Kharlov and Coovshin (East Murman) in the years 1967 and 1968 425 birds of 8 species were examined for their infestation with Ceratixodes putus Pick.-Camb. Studies were carried out on the distribution of the ticks on hosts, dates of its attacking and metamorphosis in nature, and its dependence on temperature and microclimate of habitats

Gamasid mites of 45 species were found in nests of the water vole (Arvicola terrestris L.) from the southern Tjumen district. More than 78% of collected mites are parasitic forms of which Haemogamasus ambulans (Thorell) and Hirstionyssus isabellinus (Oudms.) are most abundant. Data on seasonal changes in the number of parasitic and free-living gamasid mites are given.

21 species of gamasid mites were recorded from the Tamarisk and midday gerbils of the Tersko-Kumsk territory (North Caucasus). The paper contains data on seasonal changes in the number of specific parasites of gerbils, Haemolaelaps longipes Breg. and Hirstionyssus meridianus Zemsk., their distribution in habitats and behaviour in different years and territories.

Alphitobius diaperinus Panz., which is known as a stored-grain pest, is capable for predatoriness. Settling in biotopes of Dermanyssus gallinae Redi beetles exterminate eggs, nymphs and adults, thus reducing the mass reproduction of this parasite in poultry yards.

The paper contains a description of two new species of trombiculids, Trombigastia schlugeri sp. n. and Riedlinia assadovi sp. n. found on bats, Rhinolophus mehelyi Matschie and Miniopterus schreibersii Kühl, from Azerbaijan. The species found belong to the genera new in the fauna of the USSR.

In the forests of mountain Crimea Polyplax serrata is fairly abundant on Apodemus flavicollis. On A. sylvaticus near the upper border of the beech forest P. serrata dominates while in the zone of leafy-mixed forest, where animals are less infested, Hoplopleura affinis is most abundant. Microtus arvalis is normally infested with H. acanthopus, the infestation being lower in the zone of leafy-mixed forests. The infestation depends on sex and age of hosts.

97 birds of 10 species (see the Table) were examined. On them there were found 26 species of bird lice one of which, Amyrsidea tetraogalli, from Tetraogallus himalayensis Gray was new. Its description is given.

The author reports on the discovery of 22 larvae of 2-nd and 3-rd instars of Hypoderma diana Br. under the skin of the lumbar region in the male of roe deer from the Tjumen district.

Studies of the lifetime of adults of Xenopsylla skrjabini Ioff and X. nuttalli Ioff were made at a temperature of 8 to 34° C at a relative humidity of 35—92%. The lifetime of fleas reduced with increasing temperature and decreasing humidity. Females lived longer than males. The lifetime of X. nuttalli was found to be much shorter than that of X. skrjabini. 50% of regularly feeding fleas of X. skrjabini lived at low temperature (8 to 17°) over 6—7 months (single individuals more than a year), at a temperature of 20 to 24° they lived 1.5 to 2 months (single individuals about 6 months). 50% of regularly feeding fleas of X. nuttalli lived at a temperature of 8 to 17° from 3.5 to 5 months (single individuals about 8 months) and at 20 to 24° — not more than one month (single individuals more than 6 months).

In the mid-stream of the Kolyma and Anadyr rivers there was first found Aedes fitchii new for the fauna of the USSR. In the vicinity of Upper Seimtchan and Markovo A. fitchii is one of the mass species. In 1966—1967 the mosquito appeared in nature in the 2-nd decade of June, the mass flight was from the 3-rd decade of June to the 3-rd decade of July. Females favour borders of forests and open places. The mosquitoes attack men and animals.

Sporanges of the parasitic fungus of the genus Coelomomyces were found in larvae of Aedes vexans Meig. from the Primorye territory (the Far East). This fungus is rarely occurred in larvae of A. vexans and is absent from larvae of other species of mosquitoes. The sporanges found belong to C. psorophorae Cough.

Examination of various groups of population in the Ukraine has shown a higher infestation rate with Lamblia of the rural population as compared with the urban one. In towns among children of the under school age the infestation rate was 4.5%, in the country — 22%. The higher infestation rate may he explained by the maintenance of dogs in farms which proved to be spontaneous carrier of Lamblia canis and susceptible to L. intestinalis.

Summary is absent.

Summary is absent.

Summary is absent.