Oedemeridae

The family Oedemeridae is a cosmopolitan group of beetles commonly known as false blister beetles. There are some 100 genera and 1,500 species in the family, mostly associated with rotting wood as larvae, though adults are quite common on flowers. Oedemeridae may be defined as slender, soft-bodied beetles of medium size found mostly on flowers and foliage. The larvae of most genera are xylophagous, boring tunnels in spongy, damp wood in an advanced state of decomposition. Larvae of the genera Oedemera and Stenostoma develop in dead stems of herbaceous plants. Adults contain the toxic cantharidin in their corporal fluids as a defensive mechanism; several species show brilliant and metallic blue, green, gold or coppery, often combined with yellow, orange or red. Adults are mainly polyphagous pollen and nectar-feeding, and diurnal in activity. Read more on Wikipedia.