Twenty years have passed...

The author presents a view on his own publications on carabid beetles published in the period 1959-1994. Even though they were lacking - according to contemporary standards - proper statistical elaboration, the results presented there can be useful for present investigators. As an example, it is shown that one trying to study biodiversity of carabid beetles in a site, should base his estimates on recognition of population density of each species, and repeat the estimates during a few years.