A Blister Beetle (family Meloidae): We can say with certainty that this is a blister beetle. Based on its shiny appearance, it may be the Ash Blister Beetle (Linsleya sphaericollis). Adults are known to feed on a wide variety of plants, including those from the family Asteraceae — which includes the tansy pictured here. If squeezed, the adults will ooze chemicals that can blister your skin as a defense. Photo by Heather McKee on 7/19/18 in Missoula, MT.