Abstract
Comparative studies were made on the pleural structures of the thorax of adult mosquitoes of 58 species collected from Japan. It was demonstrated through these observations, that tribes, genera, subgenera, some species-groups or species could readily be separated by the pleural characters, such as the presence or the absence, or the numbers and the arrangements of certain bristles and/or scales. The figures of each species and the key to differenciate these groups by the pleural structures were presented together with the description in Japan for all the species concerned. The above study suggests that examination of the pleural structures of the mosquitoes are of essential taxonomic importance, and that it often provides information most convenient or valuable for the identification of the species or species-groups of the mosquitoes.
