THE PUPA OR CHRYSALIS. 101 



tinuous web like that of the Silk-worm. Saturnia 

 Carpini, another of the family, however, makes a 

 very pretty cocoon of true silk, as do the larvae of 

 many British Moths ; while others mix with the silk 

 other substances, which they weave along with it. 

 Chelonia Villica weaves a cocoon of very loose, 

 open thread; the Fox-moth, a close semi-trans- 

 parent tube, closed at each end and bent in the 

 form of a crescent, much larger than the chrysalis. 

 This cocoon has somewhat the consistency of tissue- 

 paper, and within it the chrysalis is said to move 

 about, as described when speaking of the power of 

 movement in chrysalides. 



The Burnet-moth Caterpillar also makes a cocoon 

 of singularly compact paper-like tissue, as do some 

 others ; while the handsome Caterpillar of the com- 

 mon Moth, Clisiocampa Neustria, weaves a woolly- 

 looking yellow cocoon, which appears covered with 

 a substance like powdered sulphur. 



The small larvae of one of the Moths of the Tor- 

 trix family, Tortrix Prasinana, forms a compact 

 brown cocoon of a curious boat-like shape; and endless 

 other varieties of form and general character occur. 



Although it has been shown what comfortable 

 houses of silk, and other analogous substances, the 

 larvae of Moths form for themselves as retreats in 



