They will, but they shouldn't. The solids in mollasses is not good for them and gives them dysentary.
http://www.beesource.com/pov/usda/abjfeb1977.htm
"Unrefined sugars have poisoned bees. The toxic factors in molasses and in brown sugars have not been identified. Bailey (1966)"
http://www.beesource.com/pov/usda/abjfeb1977.htm
"Unrefined sugars have poisoned bees. The toxic factors in molasses and in brown sugars have not been identified. Bailey (1966)"
