Using an activity meter to measure flight sounds, researchers found that: 1) Intensity of flight sound can predict density of flying mosquitoes at frequencies between 400-800Hz, but only when temperatures were over 63°C. 2) Patchouli increased observed flight levels compared to no stimulant, though intensity did not correlate with density likely due to background noise. 3) The activity meter shows potential for measuring flight capacity under controlled conditions and could be adapted for field use to study mosquito migration hypotheses for repopulation after dry seasons.