Kovács I. Endre szerk.: Rovartani Közlemények (Folia Entomologica Hungarica 12/1-23. Budapest, 1959)

An examination of the fiighf periods off dragonflies in Hungary. By K. Steinmann Hungarian Natural History Museum, Budapest. The figures on pages 2-10 show, in a quantitative columnal-graph system, the flight periods of our home dragonflies. The imaginary curve drawn on the upper level of the several columns presents the flight function of the animal. Periods/months, thet is, ten-day durations/ are shown on the horizontal axis, collecting data hinge on the vertical axis. Any occurrence /from different localities in the same period or vice versa /counts always as one datum, irrespective of the number of collected specimens. If we were to regard collectings as even, the graphs present also relative frequency pictures. The number of unjustified dropbacks testify on defective collectings. Data with question marks are dubious. On the basis of the figures, I grouped the order of sequence of the appearances cf our dragonflies according to months and ten-day periods, then, comparing them with German tabulations of a similar character, I was able to establish thet the dragonflies of Hungary emerge, thet is, fly, with the exception of some few, generally earlier /10 or 20 days/. This is maybe caused by temperature difference in our open waters. To the flight period graphs composed on the basis of about 4000 specimens collected in about 100 localities, I annexed locality maps. On these two maps, showing the area of Hungary in two portions the sevarai localiti«s are indicated by circles. In thr lists following the maps, the meanings of the numbers given in the circles of the respectivs