54. Hydrophorus signifer Coquillett, 1899

Material examined. 32♂ ♀, [Kamchatka Territory,] Commander Islands, Nikolskoe environs, on water, 7– 20.09.1959, K. B. Gorodkov .

Distribution. Type locality: Russia: Bering Is. Palaearctic: Austria, Belgium, Czech, Finland, Latvia, Netherlands, Norway, Sweden, Russia (Kamchatka, Karelia, Murmansk, Nenetsia, N Ural, Yakutia); Nearctic: USA (Alaska), Canada (Yukon Territory, Northwest Territories, Manitoba, Quebec, Newfoundland).