Black horn-gems are a tiny species of soldier fly (family Stratiomyidae) with a striking, shiny green thorax. They are found in Europe, Asia, and North America in well vegetated areas. Larvae are scavengers, feeding on various types of decaying organic matter, especially dung, while adults feed on flower nectar. This fly was possibly introduced to North America via ship ballast, a common method of accidental introduction of insects to eastern North America, at some early date, and became established and widespread.
Photo by Kristi DuBois on 5/18/20 in Missoula, MT