sand bee? solitary bee?

sand bee? solitary bee?

Observation - sand bee? solitary bee?. Description: Hi - we have lots - hundreds - of these bees burrowing in our lawn making tiny 'bee molehills'. Any idea what they might be? Do they sting? Are they... a good bee to have around? Thanks for any help.

Hi - we have lots - hundreds - of these bees burrowing in our lawn making tiny 'bee molehills'. Any idea what they might be? Do they sting? Are they... a good bee to have around?
Thanks for any help.