134 



THE HOP. 



The young caterpillars, at first almost black, but after- 

 wards pale green in color, feed together in bands on 

 the undersides of the leaves. When they reach the 

 third stage, they begin to scatter, and thereafter feed 

 singly, assuming a velvety black color, with two nar- 

 row- yellow lines down the sides, between which are 

 numerous transverse irregular finer, yellow lines. When 

 full-grown, they burrow into the ground and change to 

 pupae in about two days. The insects pass the winter 

 in the pupal stage, the moths issuing in May and June. 

 The young caterpillars are found from the first week in 



FIG. 67. ZEBRA CATERPILLAR. 



a, Larva; 6, adult. Natural size. (After Riley.) 



June to the first week in July, and reach their full 

 growth in about four weeks. A second brood of moths 

 in more southern localities appears during the early 

 part of July. 



THE COMMON WOOLLY BEAR CATERPILLAR 



(Spilosoma virginica, Fab.) 

 This is another common, widespread species with 

 many food plants, which is quite often found in the hop 

 yards, feeding upon the weeds, as well as upon hop 



