208 CATERPILLARS AND THEIR MOTHS 



In five days they spun a second web over a leaf and 

 fastened their anal props in it, and two days later they 

 molted, leaving rows of empty skins like little sheds. 

 This time they were over a quarter of an inch long. 

 Their heads were round, shining black, slightly bilobed. 

 Their bodies were as before, except that the hairs were 

 denser and longer, being longest over the head and 

 anal end. They now lived in two close groups, one on 

 each side of the leaf, and still ate only the green part. 

 They moved very rapidly and crawled under the leaf 

 when the box was opened. 



Four days later they spun a third web for molting, 

 and in two days molted. Their heads and bodies were 

 as before, except that on the fourth segment the black 

 dot nearest the dorsal line on each side gave rise to a 

 long " pencil " of black hairs, that is, hairs grouped as 

 in a paint-brush, often called a " camel's-hair pencil." 

 These two pencils united over the dorsal line, forming 

 one, and on the dorsum of each segment behind the 

 fourth were two short black pencils, united in one in 

 the same way. These made the " black buttons down 

 the back." On the fourth segment was a long single 

 pencil near the stigmatal line on each side. All the 

 other hairs were now clear v,hite, longer than before, 

 and longest over the two ends. 



The caterpillars now ate through the leaf, and only 

 the largest veins and midrib were left. They no 

 longer kept in close groups, but were still gregarious. 

 We divided them in four boxes, and had hard work 

 to keep all in when a box was opened. 



In five days they molted for the fourth time, with 

 very slight web-spinning beforehand. The only 



