During the last two decades, the study of Acarina has undergone extensive growth, both in the number of workers in the field and in the output of publications. For this reason, it is virtually impossible for acarologists to become acquainted with more than a small percentage of the other researchers in their field. The objective of History of Acarology is to present biographies of acarologists by country and, to the degree dictated by space considerations, a list of their publications and the areas in which they worked. A total of 25 countries is dealt with, but a few countries, in which complete biographies and bibliographies would have comprised volumes in themselves, had to be omitted. Much important information on the faunas (including lists of species) of the different countries is included.