There is much of biological interest to be found in the life history of the ChrysopidÆ. The group is a very homogeneous one, varying little in morphology and habits. They are of wide distribution, and one or more species in all localities visited can be appropriately classed among the most common insects. Several species are somewhat rare and difficult to collect, hence, the biological data available concerning these is still somewhat fragmentary. This brief paper is a summary of a large detailed paper, the publication of which has been unavoidably delayed. A full report of this work is now awaiting publication as a thesis for the doctorate in the memoir series of the Cornell University Experiment Station. This report will be amply illustrated.