Abstract
Ten years ago I studied such of the dragonflies of the subfamily Corduliinae as I found accessible in this country. I made exchanges, and visited the principal museums, and was able to get acquainted with about three fourths of the known genera. I studied them especially with reference to their wings, and drew up a sketch of the principal lines of their specialization as evidenced by the wing veins. This mere outline was later included in my “Genealogic Study of Dragonfly Wing Venation”.1 There remained a number of genera of which I had no knowledge, save such as might be gained from brief descriptions, that noticed but few venational characters, and these often the least important ones. Even at so recent a date, there were no good figures of dragonfly venation published, save only a few of fossil species; and the cuts illustrating dragonfly venation in the text books were for the most part the worst of caricatures, as in some of them they still continue to be.2
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