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By M. W. Service (auth.)

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Culicinomyces) that cause larval mortality. There are also several parasitic nematodes that kill mosquito larvae, and the most promising for control purposes are Reesimermis nielseni and more importantly Romanomermis culicivorax, which has in the past been misidentified as R. nielseni which appears to be more specific in its hosts. These parasites and pathogens appear harmless to man. Although there is interest in the possibilities of mass rearing or cultivating parasitic nematodes and various pathogens, especially Bacillus thuringiensis, to control mosquitoes, investigations and trials are still mainly at the experimental stage.

4). The veins are covered with scales which are usually brown, black, white or creamy yellow, but more brightly coloured scales may occasionally be present. The shape of the scales and the pattern they form differs considerably both in different genera and species of mosquitoes. 4). In life the wings of resting mosquitoes are placed across each other over the abdomen in the fashion of a closed pair of scissors. The legs of the mosquito are long and slender, consisting of a short coxa and trochanter, a long femur and tibia and a long five-segmented tarsus, which terminates in, usually a pair, of toothed or simple claws.

Oviposition and biology of the eggs Depending on the species, female mosquitoes lay about 30-300 eggs at any one oviposition. 9a). In many mosquitoes, such as species of Anopheles, Culex and some Mansonia, the eggs are laid directly on the water surface. 9c and 6. I 3). Eggs of none of these mosquitoes can survive desiccation, consequently if they become dry they die. In the tropics eggs hatch within about two to three days, but in cooler temperate countries they may not hatch until after about 7- I 4 days or longer.

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