180 CATERPILLARS AND THEIR MOTHS 



The liatchlings were pale green, granulated, and un- 

 marked. Their caudal horns were dark brown and 

 rough; in another brood were gray or red at first, 

 turning black in a few hours. The horns were straight, 

 long, and slender. The heads were wider at the bottom 

 than at the top, but not really triangular, as they be- 

 came in later stages. 



The caterpillars began to eat poplar at once, stand- 

 ing on the edge of a leaf and eating through the whole 

 leaf, cutting curves out of the margin, instead of eating 

 only the parenchyma, as do many young larv^. They 

 did not eat the egg-shells. On the second day pale 

 yellow subdorsal and oblique lines showed faintly, the 

 former extending from head to horn and crossed by 

 the obliques. Faint white granules also appeared, be- 

 coming clearer on the third daj^ 



On the fifth day the caterpillars molted, having tri- 

 angular, white-green heads rough with white granules, 

 yellowish face-lines, and two yellowish granules at the 

 apex. Their bodies were very pale green, with yellow- 

 white granules and yellow-white subdorsal lines, widest 

 on the thoracic segments, crossed by the yellow-white 

 obliques, the last pair of which was widest and yel- 

 lowest. The legs were green with pink tips, the projis 

 green, and the anal props were prolonged at the lower 

 end in the rear, like those of modesta. The horns were 

 short, rough, almost black in front and rear, but yellow- 

 white on the sides from the last pair of obliques. All 

 the lines were formed of granules, the larger ones being 

 sharp. The caterpillars ate their skins, except the 

 horny masks. 



In four days they molted again, being much as be- 



