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 arc 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 

 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 Europe. 

 These moths are readily known by 



