Off the top of my head no I don't know the specific details of butterfly embryology. I'm not near a computer right now but why don't you do a search on Google Scholar and I guarantee you there will be a plethora of peer reviewed papers that explain the process at a genetic level.
One of the problems is that you lack knowledge of the most basic science so describing complex stuff like evo devo is like explaining calculus to somebody who can't count to ten.