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5 species of urceolariids have been found on fishes from natural water bodies of Armenia: Trichodina jadranica armeniensis Grigorjan et Stein subsp. n. on the skin of Neogobius fluviatilis, Trichodina reticulata Hirschmann et Partsch, 1955 on the skin of Rutilus rutilus schelkovnikovi, Trichodinella epizootica (Raabe, 1950); Tripartiella copiosa (Lom, 1959); Paratrichodina incisa Lom, 1963 on the gills of Alburnoides bipunctatus armeniesis. Additional taxonomic characteristic has been proposed for identification of trichodinids with a clear zone in the centre of the adhesive disc: ratio between the diameter of the clear zone and that of the denticulate ring (per cent).

The effect of the density of micropopulation on the physiologically different strobile sections of Dyphillobothrium latum was estimated statistically.

Experimental study of the postembryonal development of cestodes of the family Dilepididae, Paricterotaenia decacantha (Lumbriculus variegatus serves as an intermediate host) and Dichoanotaenia tundra (larvae of Pryonocera gracilistyla serve as an intermediate host), has revealed the identity of the main stages of larvogenesis. Larvae of the both species belong to the same variety of cysticercoid — monocercus. The developmental periods of larvae at the fixed temperature have been established. The morphological description of some developmental stages is given.

In summer and autumn of 1971, 1972, 1977 in Podiceps nigricollis (83.3—100%) from Tengiz Lake (Central Kazakhstan) there were found cestodes of Confluaria podicipina, the infection rate being 4 to 200 cestodes per one bird. The examined specimens of Artemia salina from the same water body turned out to be spontaneously infected with larvae of these cestodes too (0.05—0.35%). The postembryonal development of C. podicipina in the intermediate host Artemia salina was traced experimentally.

The finding of Aspidogaster limacoides in fishes from the Rybinsk water reservoir is first reported herein. In 1978 the single helminth of this species was found in one bream of 18 examined and in 1980 — in 18 of 21 examined roaches, the infection intensity being 1 to 105 specimens. The prevailing number of aspidogasters was localized in the initial parts of the anterior portion of the intestine. Apparently, A. limacoides penetrated the reservoir with fishes or mollusks from the lower Volga. The fishes are supposed to play a role of postcyclic definitive hosts in the developmental cycle of A. limacoides.

A new genus and a new species Imosmermis morosovi gen. sp. n. found in the flea Xenopsilla gerbilli minor Jordan are described. The genus Imosmermis differs from all known genera of Mermithidae by the absence of mouth and reduction of stihostome and the dorsal chord. Body is long and very thin. A new genus Aphanimermis comb. n. for the species Psyllomermis tshumacovae Rubzov is created. This genus is characterized with a stilet, with high developed lateral and ventral chord as well as with a tail which is absent in other genera infecting fleas.

Of wild carnivorous animals from the Far East of the USSR wolf plays the main role in the maintenance of natural nidi of dioctophymosis.

Results of the use of the light trap for studies of seasonal changes in the abundance and age composition of females and for the establishing of the number of generations of Culicoides sinanoensis, the most abundant species of bloodsucking black flies in the south of the Krasnojarsk district, are given. Certain advantages of the light trap over the Monchadsky's bell are recorded.

24 species of bloodsucking mosquitoes of the genera Aedes and Culiseta are recorded from south-eastern and western Evenki a situated in Central Siberia, of which C. bergrothi, A. increpitus, A. mercurator and A. riparius are first reported for Evenkia. The specific composition, dominant species in water bodies and air, phenology, the activity in attacking man and reindeer, parameters of external factors typical of the attacking of warmblooded animals are noted for each investigated area.

Allantonematides Psyllotylenchus pawlowskyi and P. caspius, parasites of the body cavity of the flea Ceratophyllus laeviceps, affect greatly the abundance of this vector and its reproduction in the Volga-Ural sands.

Investigations of the fauna of fleas of Sorex daphaenodon Thomas were conducted in the Charskaya hollow of the Chita district in summer of 1975—1977. 10 species of fleas were recorded. Data on the abundance dynamics of the specific and dominant species of shrews, Doratopsylla birulai Ioff, are given.

The specific name of the myxosporidian (M. noblei Zubtschenko, 1980) described from Macrurus rupestris from North Atlantic has turned out to be preoccupied (M. noblei Konovalov, 1966 from Thymallus arcticus grubei n. mertensi from water bodies of Kamchatka). The new name M. profundum is suggested.

A blood parasite was found in hens from southern Kazakhstan. The blood parasite was referred by the authors to Leucocytozoon (Akiba) caulleryi Mathis et Leger, 1909.

4 species of horn flies were recorded from the territory of the Baikal-Amur railway: Stomoxys calcitrans, Haematobia stimulans, Lyperosia irritans and Lyperosia titillans. The autumn horn fly was found to be most widespread and dangerous. It was especially abundant in Priamurje, in the zone of the monsoon climate, where it behaves as a typical pasture species. The behaviour, daily and seasonal dynamics and flight duration (90 to 150 days) of horn flies changes noticeably depending on natural conditions; they alL have a broken distribution area here. The cultivation of the Baikal-Amur railway territory by man favours the spread of horn flies over this territory. Most dangerous they are for man and domestic animals in the western and eastern parts of the Baikal-Amur railway.

Morphology of preimaginal phases of Hybomitra arpadi from the European north of the USSR described earlier by Teskey (1969) and Jezek (1977) was studied. The descriptions of the preimaginal phases by the above authors do not coincide. This induced us to study the morphology of larvae and pupae of this species once more.

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