PYKALHXE. 327 



true day-fliers. The larvae are generally known by their remark- 

 ably glassy appearance, and the few hairs on them have an un- 

 usually bristly look. Many spin a cocoon. The pupa is long, 

 slender, and conical. 



The largest form is Hypena, in which the male antennae are 

 hairy, and the palpi are long, ascending, and the fore legs are 

 not tufted, and there are often slight tufts of raised scales on 

 the fore wings. The larva is elongate, cylindrical, with four- 

 teen legs, and feeds on low or climbing plants, making a slight 

 cocoon among leaves. 



The Hop vine moth, H. liumuli Harris (Fig. 250 ; , larva 

 and pupa) is very destructive to the hop. It is marbled with 

 gray beyond the middle of the fore wings, with a distinct 

 oblique gray spot on the tip ; they are crossed by two wavy 

 blackish lines formed of elevated black tufts, and there are two 

 similar tufts in the middle of the wings ; it expands one inch 

 and a quarter. The 

 larva is glassy pea- 

 green. The body is 

 long and slender, 

 with rather convex 

 rings, and with long 

 sparse hairs. The head is rather large and deeply divided into 

 two lobes by the median suture ; it is a little more yellowish 

 green than the body, which tapers gradually towards the tail, 

 while the anal legs are long and slender, there being but two 

 pairs of abdominal legs, so that the caterpillar walks with a 

 looping gait. The body is striped with a narrow whitish line, 

 edged broadly below with dusky, and with two white lines on 

 the sides of the body, though specimens vary in the number of 

 lines, some having no lateral whitish stripes. It is .45 of an 

 inch in length. When half grown the larva is pale livid flesh 

 color, not greenish, with a broad dark dorsal line, bounded on 

 each side by a whitish line. It is double-brooded, the first lot 

 of caterpillars appearing in May and June, the moths coming 

 out late in June and early in July ; while the second brood of 

 larvae appear in July and August, the moth flying in Septem- 

 ber. It is very active, leaping off the leaf to the ground when 

 disturbed. When fully grown it forms a loose silken cocoon 



