Abstract
In Puerto Rico, Anopheles albimanus breeds prolifically in certain coastal lagoons having varying concentrations of sea water. The degree of salinity is altered by tides, evaporation and rainfall. These factors operate to create favorable or unfavorable conditions for mosquito breeding according to the tolerance of the species. It has been recognized that A. albimanus will not tolerate high concentrations of sea water and in certain instances this mosquito has been controlled by the introduction of sea water into land locked coastal lagoons (Washburn, 1933, and Tullock, 1937). The investigation here recorded was made in order to obtain more precise information on the limiting concentration of sea water required for the control of this species and the means by which such a concentration can be maintained in certain natural breeding places. It was found convenient to express the relative salinity in terms of per cent of sea water as determined by a hydrometer. Either a sodium chloride hydrometer or a urinometer may be calibrated from known dilutions of sea water. Eighty degrees Fahrenheit was taken as a convenient temperature and calibrations were made at five per cent intervals.
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