Unless your B. craniifer have FULL BLACK WINGS then it is not a B. craniifer... if it has light colored wings with whatever type of brown marks it's not a B. craniifer it's a B. fusca hybrid something or other.
The problem with these guys is people think that because the name written on the container they were shipped in then that's what they are. I agree with Matt K, Damn the hybrids! If people would not label the hybrids (and sell them) as pure strain or whatever strain then it wouldn't be a big deal.
Let’s put it this way: People would be pissed if I sold them a pure bred German short hair, and charged them for it as such, if the mother was a black lab. Then of course the new owner would take their new “dark strain” German short hair and breed it with their pure German short hair… thus every single offspring after that is tainted. No longer is it a German short hair, it’s a lab mix no matter how many generations go by! Having a mutt is fine, just don't sell it as a pure bred because then everyone else is going to get mutts eventually.