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In this episode is discussed the blister beetle 🪲 the Spanish fly... which emits Cantharidin. jump ahead to 14:20
From Google:
Buprestis Beetles emit the same chemical as well.
Buprestid beetles (also known as jewel beetles or metallic wood-boring beetles) and blister beetles are both beetles, but they differ in several key aspects. Buprestids are generally larger and more metallic, with some species having iridescent colors. They are often found in wood, while blister beetles are more associated with plants, especially flowers.
Blister beetles are known for their ability to release a toxic fluid that can cause blisters on the skin, giving them their name.