الفهرس 
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Abstract
The present work was carried out to investigate certain biological and ecological aspects of neuroptrous predatory insects during two successive years of 2006/2007, 2007/2008 in Mansoura district. The obtained results are summarized as follows:
1. Ecological studies: The obtained results showed that there were four neuropterous predator species namely: Chrysoperla cranea(Steph.), Chrysopa septempunctata Wesm., Cueta variegata Klug. and Palpares cephalotes Klug belonging to the two families namely: Chrysopidae and Myrmeleonidae were recorded two successive years at Mansoura district. The data revealed that C. carnea had five-six peaks per year, C. septempunctata had three-four peaks, C. variegate and P. cephalotes had three peaks per year during the course of this study. The statistical analysis showed that there was a highly positive significant correlations between the population density of C. carnea, C. septempunctata, C. variegate and P. cephalotes and temperatures parameters during the two years of study. While the relative humidity parameters had insignificant effect on the population density of these predatory insets. It can be concluded that C. carnea at the release level of 600 larvae per plot yielded exellent control of A. craccivora with reduction percentage of 92.90% after two months from release under field conditions.
2. Biological studies: The obtained results assured the effect of the six prey kinds on the developmental time, consumption rate of larval stage and the longevity of male and longevity and fecundity of C. carnea female. The shortest developmental time was obtained when larvae reared on A. gossypii, while the longest was recorded on I. seychellarum eggs. The total consumption rate from the six prey insects by the larval stage of C. carnea showed significant difference. Concerning the food preference for the predator larval among prey insects tested. the average male and female longevity of C. carnea was significantly longer when fed on I. seychellarum eggs, followed by A. craccivora, A. gossypii, E. insulana eggs, M. persica, and shorter on A. aurantii nymphs. Meanwhile the prey type had a significant effect on female fecundity. The highest number of eggs was obtained when females of C. carnea fed on A. craccivora followed by A. gossypii, A. aurantii nymphs, M. persica, I. seychellarum eggs, while the lowest numbers were achieved on E. insulana eggs.