Looks Female to me, but i can't for sure. B. emilia's are one of the hardest IMO to vent sex (harder than the LP, IMO). The reason is because the first set of book lungs are far apart like a female for both males and females for this species. I know that I have seen some some males before that don't have that noticeable patch for this species, which makes it hard/tricky. But i'll guess female for this one.