Those are what we call wasps - I have heard the term european wasp, too. I was already wondering when you said they were around the trash can, bees wouldn't do that. If your son was stung by a bee, you probably would have found the - what is it called in english? - the thorn/sting of the bee. When bees sting they loose them and die, wasps don't.
When it gets colder, most wasps will die and before that there is a time where they get more aggressive. Put up wasp traps with soda, lemonade - they get attracted by the sweet smell and will drown in it. I know it is hard, but if you have one flying around you, keep calm, don't hit, stay very still, eventually they will fly away.
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Nathalie
eNKay Design
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