HEAT oven to 350°F. Cook pasta according to package directions; drain well.
MELT 3 tablespoons butter in large sauce pan. Add flour and cook over low heat 2 minutes, stirring with a whisk. Gradually stir in half-and-half and cook until slightly thickened. Turn off heat and add both cheeses, capers and nutmeg. Season with salt and pepper. Add pasta and lobster; stir well to mix.
SPOON mixture into 4 individual gratin dishes. Melt remaining 1 tablespoon of butter and combine with bread crumbs; sprinkle on top. Bake 30 minutes or until the sauce is bubbly and top has browned.