Mix the curry powder into the mayonnaise. Put the remaining ingredients in a large bowl. Dress with the curried mayonnaise. Chill 1-2 hours.
NOTES: A cold pasta dish -- This salad is quick and easy. It's best if made several hours before serving, to get the full curry flavor. It's been a real hit at potlucks. Serves 4 to 6.
* A honeydew ball is a ball of honeydew melon that is scooped out of the flesh of the melon with a "balling spoon" or "melon baller." About 1 1/3 cups of conchiglie will make about three cups of cooked macaroni.