In North America, this species was first collected from Cordova Bay, Vancouver Island, by Dr. R. Ring of the University of Victoria, and shown at the meeting of the Canadian Entomological Society there in 1971. An adult specimen in the Canadian National Collection, however, appears to have been collected 20 years earlier at Horseshoe Bay by C. D. Garrett. Dr. M. Trimble and I have found it on the Gulf Islands, all along the Sechelt Peninsula and on Howe Sound, 46 km north of Horseshoe Bay. This species may have been introduced from Japan as Wood et at. (1979) suggest, but when milder climates prevailed, it could have been widely distributed around the Pacific rim. If its range is found to extend further north, I would find it difficult to believe that it is a recently introduced species. The larvae are found in rock pools just above high tide. They can easily be overlooked as they are able to remain for long periods in the debris at the bottom of the pools without surfacing. Adults bite humans readily but do not fly far from shore. Ae. togoi can transmit several diseases including Japanese B encephalitis and filariasis in Malaya, Japan and the coastal area of U.S.S.R. north of the Sea of Japan (La Casse & Yamaguti 1950). Fortunately these diseases do not occur in British Columbia.
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