26 



ZOOLOGY 



by soaking the cocoon in hot water ; then several of these 

 ends are brought together and united to form a single fibre 



of raw silk. Another imported silk-moth 



common in parts of the United States is the 

 Cynthia 1 moth, whose larva infests Ailan- 

 thus trees. True American forms are the 

 brown Polyphemus 2 moth, whose larva is 

 colored light green, with oblique yellow 

 stripes; the Promethea 3 moth, whose cocoon 

 is formed in a folded leaf which is securely 

 fastened by silk threads to its twig ; the 

 Cecropia moth, expanding six 

 inches, whose coarse tegumen- 

 tary cocoon is bound along 

 its whole length to a twig; and the nearly 

 equally large Regal moth (Citheronia regalis, 

 Fig. 23), whose larva is oar largest cater- 

 pillar (Fig. 24). All of these species are 

 easily reared from the larvse or cocoons. 



Closely allied to the Bombycidre are the 

 Tent-caterpillars, which are never of great size. 



FIG. 25. Adult 

 female of Cli- 

 siocampa dis- 

 stria. From life. 

 Nat. size. Pho- 

 to, by V. H. L. 



Fin. 20. Adult 

 male of Clisio- 

 cainpa. From 

 life. Nat. size. 

 Photo, by V. 

 H. L. 



These are 



FIG. 27. Egg masses of forest Tent-caterpillar, laid on branch. Photo, by 



V. H. L. 



1 A poetic name of Diana, from the mountain Cynthus. 



2 The name of the fabled one-eyed giant blinded by Ulysses. 



3 A name in Greek mythology. 



