In a bowl, combine white pepper, cayenne, garlic powder, and onion powder; set aside. In a saucepan, melt butter at 200=B0. Add flour until smooth. Add milk slowly to form cream. Add 1/2 seasoning mix, hard-cooked eggs, and crabmeat; blend together well. Allow to cool. Form into croquettes. In a separate bowl, add remaining seasoning mix and eggs; blend well. Dip croquettes into beaten eggs, then into bread crumbs. Fry until golden brown. Pour over with Cream of Wine Sauce.