In western WA, looks exactly like a fly but has this tail and I’ve never seen it before, anyone know what it is? It’s about a centimeter and a half in length. TIA!
Found >100 of these in basement (Philadelphia PA/US)
Any idea? I thought they were flies at first but they’re really sluggish and barely move. Basement is old, some cracks in the stone foundation, does take on small amounts is water in rain (puddles).