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The head, thorax and legs are red or orange, the elytra are black, but sometimes look metallic blueish. Between 3 and 5 mm in length. The head is held downwards but still visible below the thorax, the antennae have the last 3 segments expanded. These beetles are predaceous. Family Cleridae, subfamily Orthopleurinae.
During May I was finding between 3 to 5 of these beetles every day in my bedroom window. I have no idea where so many are coming from inside the house. San Cristobal de Las Casas, Chiapas, Mexico. Outside is Oak-pine forest, 2,200 meters.
Many thanks to Francisco Acosta and Clerid for the identification. https://bugguide.net/node/view/614009/bg... https://bugguide.net/node/view/447302/bg... https://www.naturalista.mx/taxa/704159-O... https://www.flickr.com/photos/98531807@N...