272 



INSECTS INJURIOUS TO THE GRAPE. 



expanded, measures from one and a half to two inches across. 

 The figure represents a female; the males are somewhat 

 smaller. Both sexes have the wings white, with a few black 

 dots, which vary in number in different specimens ; in some 

 there are two on each of the front wings, and three on each 

 of the hinder pair; in others the spots are partly or almost 

 entirely wanting. The dot, however, near the middle of the 

 front wings is almost always present, although sometimes 

 very faint. The under side usually has the spots more dis- 



FiG. 281. 



cc^ 



tinct than the upper, and sometimes there is a slight tinge of 

 yellow over its white surface. The antennae are white above, 

 dark brown below, the head and thorax white, and the ab- 

 domen of an orange color, usually streaked across with white, 

 and having three rows of black spots, one above and one on 

 each side. The under side of the abdomen is white, occa- 

 sionally tinged with orange, and the thighs of the fore legs 

 ochre-yellow. 



The eggs, which are round and yellow, are deposited on the 

 under side of the leaves in large clusters, and in a few days 

 hatch into small hairy caterpillars, which feed for a time in 

 company, devouring at this tender age the under side of the 

 leaf only, the outer skin over the eaten part soon becoming 



