What one generally refers to as spine mealies on the spines of cacti are usually , in actuality, the white egg cases of the mealy bug, a curious, hairy, little, soft, chalk white to grayish creature which can usually be found half hidden by the whool in the apex or ath the areoles of the plant, down in the folds of the ribs or tubercles, or, in the case of leafy succulents, on the under side of the leaves or at leaf axils.