166 CATERPILLARS AND THEIR MOTHS 



They molted when five days old, coming out a little 

 over half an inch long, and rough with yellow granules. 

 The head was small and blue-green, the body yellow- 

 green, with short setse, as in the last stage. The horn 

 was pale green with dark gray spines, and the other 

 marks were like those of the last stage. 



Four years later the Other of Us found a moth, early 

 in the morning, on an elm trunk, and the larvae from 

 its eggs differed a little in this stage from our first 

 ones. They were glassy green with yellow-white 

 granules, had dorsal, lateral, and oblique lines of white 

 granules, and a collar of these on the first segment. 

 The horn was pinkish, with black thorns. The sub- 

 dorsal line was confined to the thoracic segments. 

 Both broods had the thoracic horns well developed. 



Four days later the first brood molted. The second 

 brood was six days between these molts. The head 

 was somewhat triangular, bilobed, green, granulated, 

 and had face-lines of yellow granules. The body was 

 green, with transverse rows of yellow- white granules, 

 not a bright yellow. The collar on the first segment 

 was of sharp thorn-like granules, and the dorsal line 

 was a crest of sharp thorns, the obliques being of the 

 same thorn -like granules. The second and third seg- 

 ments had a row of thorns from the horns backward. 

 The obliques reached to the dorsal line, and with that 

 made an excellent imitation of the midrib and veins 

 of the back of an elm-leaf, being exactly of its color. 

 The caudal horn was green, granulated with yellow- 

 white on the sides, and with black elsewhere. The spir- 

 acles were yellow, with a dark ring. The legs and props 

 were green ; the anal plate had a smooth yellow edge. 



