Semi-loopers are so-called because they typically bend their bodies in a semi-loop while walking. The larvae are usually greenish in colour, but yellowish individuals may also be found. The body typically tapers (becomes narrower) to the front. The moth of the plusia semi-looper (Thrichoplusia orichalcea) has a characteristic yellow area on each forewing, while the tomato semi-looper (Chrysodeixis acuta) has silvery spots on the wings. Eggs are not laid in masses and the pupae are formed in silken cocoons on plants. ​

Semi-loopers, D.Visser, ARC-VOP, Roodeplaat.