This is a quite large, distinctively colored dolichopodid dipteran commonly found flitting around on isolated but probably permanent fresh water "seeps" coming out of vertical, rotten rock that comprises the cliffs on the Bay of Fundy, N.S., Canada. I find it when walking next to the cliff, looking for bristletails (Petrobius sp., Archaeognatha) which inhabit same location, ~2 m above high tide line. Doesn't fly much, just sits and flits off sideways if disturbed. This is very much a species-poor environment with no obvious prey for the adults except bristletails, which are too big in August. Location near small villages like Halls Harbour and Harbourville, found during August. As shown, it holds its wings folded back like Hydrophorus images on Bugguide. The larger water seeps nearly always contain green algal mats, and much longer dipteran (~15 mm) larvae live in this -- could be the larvae of the same species (also have some photos of these larvae). see also #74513 (same female) and 74516 (male). Update 9 Sept 06: identified as Liancalus genualis (Loew) by dolichopodid specialist Scott Brooks, Ottawa