Maybe I should revise that to "the waxworms available here are typically sold as Galleria mellonella", because now I'm doubting what kind I get. Mine have a wingspan closer to 20~25mm and nothing approaching 40mm. It could be their living conditions stunt their growth or I have the Lesser version.

In any case the wings are flimsy and crunch up easily, so it's more the body size that I'd look at for feeding purposes.