This paper addresses the problems of sampling adult Aedes aegypti and other mosquitoes which utilize subterranean habitats such as wells and service manholes. The sticky pipe trap is a simple device with an adhesive paper insert that can be clipped to the undersides of service manholes to record the entry and exit of adult mosquitoes through the keyhole openings. This trap was 1st used successfully in Townsville, Charters Towers, and Saunders Beach in north Queensland, Australia, in dry seasons of 1996-97 to record usage by 5 species, mainly the Aedes tremulus group and Ae. aegypti, which together comprised 91% of the 1,140 adults collected. Both males and predominantly nulliparous females were recorded exiting manholes, whereas all freshwater-breeding species entering manholes were gravid, presumably seeking oviposition sites.