The absorption of water by the eggs of Corixa punctata Illig. (Hemiptera-Corixidae) under experimental conditions.

The increases in weight of eggs of Corixa punctata Illig. in distilled water at two temperatures, 14 and 20°C., are described. Development is completed within 10-11 days from oviposition at 200°C., and within 19-20 days at 14°C. The effects of various concentrations of sodium chloride on the eggs of this species are described. High salinities retard the absorption of water or may even destroy the eggs. The rate of absorption approaches more that of eggs in distilled water at the same temperature as the salinity is decreased. The eggs are able to tolerate salinities up to 0.4% NaCl. The work of other authors on the effects of temperature and salinity on the eggs of aquatic Hemiptera is discussed.