Tapeigaster brunneifrons - a new species for us of a familiar group of flies. These plucky little males take up residence on the cap of a mushroom. I’ve seen other species defending that territory from intrusions by other males, but on one occasion I saw three males of this species sharing a mushroom cap. They mate with females seeking to lay eggs on the gills of the mushroom, which represent a rich food source for their larvae.

Here is an overview shot of the male in position on its chosen Amanita sp. fungus.