Temnostethus gracilis
Temnostethus gracilis is a species of minute pirate bug in the family Anthocoridae. It is found in Europe and across the Palearctic to the Caucasus and Siberia and North America.
Temnostethus gracilis lives on the bark of various deciduous trees, both those densely covered with lichens and mosses, and on those that are quite smooth, such as, common ash or aspens. They are predatory on aphids, Psylloidea, Psocoptera and mites, but also on other small arthropods.