OUTLINES OF ENTOMOLOGY. 



73 



wood-boring. They bore between the bark and solid wood, several of 

 them working from a common center — their burrows, which gradually 

 widen to the place of exit, radiating in all directions, making fanciful 

 carvings on the inner side of the bark and the surface of the wood. 

 They often prove very destructive in forests, to both pine and hard- 

 wood trees. A species introduced from Europe fScolytiis rugulosus, 

 Ratz.) has recently excited alarm among the fruit-growers of Illinois, by 

 working under the bark of twigs and young branches, principally of 

 stone fruits, producing an effect like blight, and in some cases causing 

 the death of the tree. Prof. Forbes, who has published the first account 

 of its injuries in this country, finds it very generally distributed and 

 promising to become a very serious enemy to all varieties of fruit trees. 



CHAPTER XX. 

 Order III. LEPIDOPTERA. 



[Fig. 32.] 



Asterias butterfly, larva and chrysalis— after Tenney. 



Among the butterflies and moths we find the most attractive, and 

 with a few exceptions, the most conspicuous members of the class of 

 insects. They are recognized without difficulty by their broad and often 



