[Frequency characteristics of the flight sounds and of Johnson's organs in sympatric mosquitoes of the genus Aedes (Culicidae)].

Investigation of sounds arising during the flight of four sympatric species of mosquitoes of the genus Aedes has shown that at 24 C the main frequences of females are in the ranges of 308 to 404 Hz and those of males from 503 to 566 Hz (Fig. 1, Tab). In the first instance interspecies differences vary from 20 to 96 Hz, in the second--from 11 to 63 Hz. It has been established by means of electrophysiological methods that Johnson's organs of males of A. diantaeus and A. communis at 24 C respond to soundss of 80 to 500 Hz (minimum thresholds of reaction are from 27 to 30 dB) (Fig. 3.). Small differences between main frequences of sounds of females and optimal frequences of auditory organs of males depend on the temperature (fig. 2) and can be accounted for by the body temperature of flying females increasing that of males. Johnston's organs of males respond to sounds of females of all four species.