THE BUTTERFLY AND ITS ALLIES 



23 



the United States. The Twin-spotted Sphinx (Fig. 20), so- 

 called from the black spots of the hind wing, is destructive 



FIG. 20. Smerinthus f/eminatus, the Twin-spotted Sphinx. Nat. size. 



Photo, by W. H. C. P. 



to fruit and shade trees. The Pandorus Sphinx (Fig. 21) 

 is of a beautiful olive color ; its larva feeds on vines. 



FIG. 21. Philampelus pandorus, the Pandorus Sphinx. Nat. size. Photo. 



hy W. H. C. P. 



The Xylotropidae l are chiefly medium to small, clear- 

 winged species which fly at dusk or in daylight. Their 



, wood ; r/)e0w, to feed ; because the larvae feed on wood. 



