Bees sting with a lot more poison than wasps. That's because their stingers are barbed and if they pierce far enough into your skin the stinger and its poison

Bees sting with a lot more poison than wasps. That's because their stingers are barbed and if they pierce far enough into your skin the stinger and its poison bag and poison pumping muscle will not leave your skin unless you pull it. The bee will fly away, but in doing so it will rip its guts out and later die. The stinger will then pump way more poison into you than a wasp would -- the wasp's stinger is not barbed.