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Species composition Anophelini were investigated in the years 1986/87 and Culicini in 1987/88 at the part of the coastal region. The mosquitoes were caught from April till October, every week, at 47 stations (water reservoirs, free nature and cattle-sheds). Total 16,194 mosquitoes (2452 Anophelini and 13,742 Culicini) were caught. They belong to 26 species of 5 genera: Anopheles (4 spp.), Aedes (15 spp.), Coquillettidia (1 sp.), Culex (1 sp.) and Culiseta (5 spp.). The highest numbers of Anophelini were observed in July (1986) and in September (1987). The aggressiveness toward man showed by Culicini was found to be highest in the second half of May and at the end of July.

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Colonization of rice fields by mosquitoes and larvivorous predators was studied in asynchronous rice cultivation areas in the Philippines. Dipper samples were taken from rice fields at six phases of maturity (fallow, ploughed, nursery, newly transplanted, after tillering, mature). All phases were present concurrently at each of two study sites. Abundance levels of the vishnui subgroup of Culex and of the genus Anopheles were high in ploughed fields, nurseries, and newly transplanted fields; this was primarily because of the concentration of Culex vishnui. Theobald and Anopheles vagus Doenitz in those fields with short, sparse vegetation. Dytiscidae, Anisoptera, and Zygoptera were more abundant in fallow or mature fields. The abundance of aquatic predators decreased at the onset of ploughing and then recovered slowly as rice plants grew. The abundance of surface predators showed a similar pattern, but less conspicuously. The abundance of nonpredators (other than mosquitoes) was relatively stable with regard to rice field phases. Alleviation of mortality by predation was considered to be a secondary cause of increased mosquito abundance in the fields under early phases of rice cultivation.

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El estudio se efectuó en una presa de la provincia La Habana desde marzo de 1986 a febrero de 1987. Se realizaron colectas de larvas relacionándolas con factores químicos y bacteriológicos del agua. Se colectaron 9 especies de culicidos. Culex nigripalpus y Anopheles albimanus resultaron las más abundantes. Los niveles de contaminación variaron y fueron siempre de origen fecal. Culex nigripalpus presentó asociación con la demanda biológica de oxígeno, la demanda química, de oxígeno y el número más probable de coliformes totales y Anopheles albimanus con coliformes totales, fecales y el oxígeno disuelto del agua. Estas asociaciones variaron con la distancia entre los puntos de vertimiento y muestreo

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In the years 1981-1985 a total of 19,651 specimens mosquitoes were collected in the area of investigation--Lake Zarnowieckie environs. In that amount 15,072 specimens were identified. There were found 26 species belonging to 4 genera: Anopheles, Aedes, Culex and Culiseta. Some of the species found, such as Aedes cantans, Aedes punctor or Culex pipiens are troublesome pests and particularly aggressive to man, possible vectors of many diseases. In the cowsheds there were found 12 species, the most numerous were the specimens of Anopheles genera (92.1% of the collection). The species captured in the open area by means of the man bait were 17 in number. The highest aggressiveness to man was shown by Ae. punctor, Ae. cinereus, Ae. cantans and Ae. annulipes. In the water bodies among the preimaginal forms caught there identified were 22 species. The majority of them were: Culex pipiens and Aedes punctor. A seasonal activity of the Culicidae preimaginal forms was also observed. The considerable environmental changes caused by the construction of the nuclear power plant, and the work of the pump-storage power plant are, as it seems, the main cause of the changes in the species domination observed in this region. Any finau conclusions, however, can be drawn after the further investigations are completed.

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1. Seven types of water-insoluble adhesives were evaluated in sticky traps for collecting adults of Musca domestica L. and Chrysomya megacephala (Fabricius) or mosquito larvae (Aedes aegypti (L.) and Culex quinquefasciatus Say). 2. Adhesive viscosity affected the tackiness of the glues and this determined their trapping efficiency in air or water. 3. From the 'Hyvis' range of adhesives tested, 'Hyvis 200' was most effective for trapping adult flies. 4. With 24 h exposure to fourth instar Ae.aegypti larvae in tapwater, submerged plates coated with 'Hyvis 10', 'Hyvis 30' or 'Hyvis 200' formulations trapped the majority of larvae. In polluted water the highest rates of trapping were 17.3% of Ae.aegypti and 18.7% of Cx quinquefasciatus with 'Hyvis 200'. Floating traps were consistently less productive than submerged traps under laboratory conditions. 5. In a heavily polluted natural breeding-site of Cx quinquefasciatus, floating traps were more productive than submerged sticky traps with four of seven adhesives tested, the most efficient being 'Hyvis 200' (4.2 mosquitoes per hour) and Hyvis:polyethylene 90:10 (4.5/h). Despite the relative inefficiency of aquatic traps, emergent adults, pupae and second to fourth instars of larvae were collected quickly from the habitat.

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After imported cases, a dengue outbreak, caused by type 4 virus, affected 11 per cent of the habitants of Thio, New Caledonia. Distribution of cases by sex, by ethnic and age group, by locality and by week is established on cases confirmed by serology and/or by virus isolation. Clinical aspect was classical but liver and digestive tract of patients were frequently affected. Five haemorrhagic forms were observed. Aedes aegypti was found in each visited house; pooled specimens were found infected by type 4 virus.

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We have drawn up the faunistic inventory of Culicinae in Balagne (Corsica) in late summer. The list shows the following species (in order of frequency): Culex hortensis, Culex pipiens, Culex impudicus, Culex territans (?), Culiseta longiareolata, Culiseta annulata, Culiseta subochrea, Aedes mariae, Aedes caspius, Aedes vexans, Anopheles claviger, Anopheles maculipennis. We have observed the important recession of the maculipennis complex (only one female catched indoor) and the abundance of Anopheles claviger founded in underground resting places from the sea level up to the mountains.

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