THE HOP-VIXE HYPEXA. 
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 arranoied 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 
Hypena Hamuli (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 
