Meal Worm, the name given in Europe to the larva of a black heteromerous beetle, the tene-brio molitor (Linn.). The perfect insect, about two thirds of an inch long, appears in the evening in the least frequented parts of dwellings, in flour mills, bake houses, and pantries. The larva is more than an inch long, cylindrical, scaly, and of an ochrey yellow color; it is destructive to flour and meal, and to articles made from them; it is said to remain two years in this condition, and occasionally to have been eaten and rejected from the human stomach; it forms a favorite food for the domesticated nightingale. - The name of meal worm is given in New England to the larva of a small delta moth (pyralis fari-nalis, Harr.). The moth is often seen on the ceiling of rooms, resting with its tail curved over the back; the fore wings are long and narrow, and cover the hind ones when at rest; they are light brown, crossed by two curved white lines, and have a dark chocolate spot at the base and tip of each. The larvae are long and slender, tapering at each end, naked, and with numerous legs; they are often seen in flour barrels, meal chests, and similar places. - Some of the larvae of the moths of the genus tinea make a thick whitish gray web over corn and meal.