if you mean mason bees .. i hear the female will definitely sting you if threatened or squashed
the male wont
or at least as far as i know regarding the darker ones in usa i think you're reffering to ..
but then there's so many species perhaps they have different "stinging requirements"
Bombus terrestris are so friendly it almost doesn't matter that bad about their stinger cuz often they'll allow me to stroke them .. so long as they're not pissed off or beat .. and they love being fed honey , .. seems to revive them .
-not just those bees, any I/all I tried it with so far
however , if you just released one from half a day of tryna escape from a 60C greenhouse,
don't expect it to not sting you if it crashes into you on the way out while you release it
- and lest it be in the armpit like what happened to me a couple of summers ago - owwwww!
i can't wait to get mason bees here in uk .. its a different species
but i think 8 of these will do the work of 500 or something regular honey bees
because of the longer hours they work as mentioned already , ..
and the earlier start/later finish season times too .
there's some nice videos on youtube about them
here's one