114 STRUCTURAL AND SYSTEMATIC ZOOLOGY 

 prefer the night, and whose antennae are threadlike and 



FIG. 72. Vanessa polychloros, or " Tortoise-shell Butterfly." 



often feathery, composing the second group. To this 

 belong the dull-colored Sphinges or " hawk moths," 



FlG. 73. Moth and Larva of Attacus pavonia-major . 



which have antennae thickened in the middle, and which 



