Elementary entomology . elementaryentomo00sand Year: [c1912] species of moths of this family, be- longing to several genera. The army-worm (Leucania unipunctd) is another caterpillar which or- dinarily feeds unnoticed on rank grasses, but occasionally becomes very numerous and advances in armies, destroying all crops in its line of march. The fall army-worm (Laphygma frugiperdd) has very similar habits, but is more common in the South and West. Two FIG. 317. The dark-sided cutworm (Agrotis messoriii] (After Riley) of the most serious cotton pests are the leaf worm (Alctia argillacid) and the
Elementary entomology . elementaryentomo00sand Year: [c1912] species of moths of this family, be- longing to several genera. The army-worm (Leucania unipunctd) is another caterpillar which or- dinarily feeds unnoticed on rank grasses, but occasionally becomes very numerous and advances in armies, destroying all crops in its line of march. The fall army-worm (Laphygma frugiperdd) has very similar habits, but is more common in the South and West. Two FIG. 317. The dark-sided cutworm (Agrotis messoriii] (After Riley) of the most serious cotton pests are the leaf worm (Alctia argillacid) and the bollworm (Heliothis obso- letd], although the latter also attacks the ears of corn, tobacco, and green tomatoes throughout the Middle States. A common pest of cabbage and lettuce is the cabbage looper (A u- tographa brassicae), a bright green worm with whitish lines, which bores into cabbages much like the common caterpillars of the cab- bage butterfly. It is known as a looper on account of the way in which it 'humps' along, much like a measuring worm, be- cause two pairs of the usual abdominal prolegs are lacking. FIG. 318. The cabbage looper ~ r , Some of the larger a, male moth ; l>, egg shown from above and from side; . r i • r 'i c, full-grown larva in natural position, feeding ; </, pupa in SpCClCS < LillS lamiiy, cocoon, a, , more with a win0' expanse enlarged. (After Howard and Chittenden, United States Department of Agriculture) of from tWO tO three
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