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

Research methods. - I oould but approximately estimate abundancy value since ecological practice still leeks the method to assure a complete and simultaneous gathering of beetle specimen on a rather large square-meter area. I was therefore compelled to apply an indirect method, the socalled ^Lincoln-index". I tried to compute the approximative abundancy values by the following method. I staked two survey squares about 300 m from each other in a well-developed part of the forest. Each quadrangle «as 40 m long and 30 m broad, so the whole area of research «as 1200 m

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. Within the t«o squares, I inserted 12 half-liter empty tins, each one 10 meters away from the other in either direction. I placed into them spoiled fleeh, skins, etc. as circumstances required it. To prevent eventual rain-water logging in the tins, I made three holee /1,5-2 ma/ in their bottom. Smoothing round end threefold blotting-papers /changeable from time to time/ onto the inner bottom of the tins, I obviated the loss of even the smallest beetles captured in the traps. The top of the tins were flush «Ith the floor and the litter remained undisturbed around them. I made my surveys every 3-4 days. According to the number of the squares, I effectuated the surveys in two details. Gathering every beetle from the 12 tins of one of the squares, I marked and noted the beetle species simultaneously. The beetles were marked with a drop of oil-point on their elytra. When I finished with the marking and noting, I threw the beetles as far and as evenly as possible in and around the square

. The „marking method" and the computation of abundancy was first used by the American worker Lincoln and since that time we use it as the „Lincoln-index"

. He estimated namely the abundancy of water-fowls on the basis of the following theoretical reflection /quoted by Van der Drift/: „...the proportion of the number of animals ringed during the last