Mauris are known for having beefy metasomas.
From Eric Ythier's site:
A. bicolor aeneas morph - 7 to 8 cm
A. bicolor - 8 to 9 cm
A. mauritanicus - up to 9 cm
So it sounds like they're about the same size as adults, but maybe a *little* bit smaller.
Hope this helps.
If your emperor scorpion stops eating, don't panic.
Be nice -- you were a noob once, too
"Never ask an engineer to explain something, because he will."