A beetle in the genus Donacia: This beautiful beetle was observed skimming across the surface of a mountain lake. The adult beetles feed on aquatic vegetation above the surface of the water. Their larvae feed on the submerged portions of aquatic plants where they also “tap” into the plants stems to get the air they need to live underwater — sort of like creating your own snorkel. Photo by Glenn Marangelo on 8/16/18 near Condon, MT.