. A treatise on some of the insects injurious to vegetation . Insect pests. THE HOP-VINE HYPENA. 477 creep, because the first pair of prop-legs, found in other caterpillars, is wanting in them. The rings of their bodies are rather prominent, the cross-lines between them being deep. They are of a green color, with two longitudinal white lines along the back, a dark green line in the middle between them, and an indistinct whitish line on each side of the body. The head is green, and very regularly spotted with minute black dots, from each of which arises a very short hair. There are similar dots
. A treatise on some of the insects injurious to vegetation . Insect pests. THE HOP-VINE HYPENA. 477 creep, because the first pair of prop-legs, found in other caterpillars, is wanting in them. The rings of their bodies are rather prominent, the cross-lines between them being deep. They are of a green color, with two longitudinal white lines along the back, a dark green line in the middle between them, and an indistinct whitish line on each side of the body. The head is green, and very regularly spotted with minute black dots, from each of which arises a very short hair. There are similar dots and hairs arranged in two transverse rows on each of the rings. When disturbed, they bend their bodies suddenly and with a jerk, first on one side and then on the other, each time leaping to a considerable distance, so that it is difficult to catch or hold them. They make no webs on the leaves, and do not sus- pend themselves by silken threads like the Geometers; but they are very active, creep fast, and soon get upon the leaves again after leaping off. When fully grown they are about eight tenths of an inch long. They then form a thin, imper- fect, silky cocoon within a folded leaf, or in some crevice or sheltered spot, and are changed to brownish chrysalids, which present nothing remarkable in their appearance. Three weeks afterwards the moths come forth from these cocoons. There are two broods of these insects in the course of the summer. The caterpillars of the first brood appear in May and June, and are transformed to moths towards the end of June, and during the early part of July. Those of the second brood appear in July and August, and are changed to moths in September. The insects of the second brood are much the most numerous usually, and do much more damage to the hop-vine than the others. The moth has been named Flg- 237- Hypena Humuli (Fig. 237), the hop- vine Hypena, upon the supposition that it is distinct from the Hypena rostralis, or hop-vine snout-moth of Eur
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