COLEOPTERA 



127 



In the Middle West, espe- 

 cially in muck lands, larger 

 bill-bugs injure corn. They 

 are nearly a half inch long 

 and rather stout bodied, and 

 are commonly called Corn- 

 Bill-bugs. 



Scolytoidea. This super- 

 family, formerly classed as a 

 family, includes a great 

 number of species of small 

 insects that attack and destroy 

 shade, forest and fruit trees 

 by boring between the bark 

 and the wood. They are 

 called the engraver-beetles 

 because of the patterns on 

 the wood made by their 

 galleries. These can easily be 

 seen by removing the bark 

 from an infested branch. 

 Another common name is 

 the bark-beetles. The Fruit- 

 tree Bark-beetle (page 291, Part 

 II), is the best-known ex- 

 ample. On account of the 

 numerous small round holes 

 which the emerging beetles 

 make in the bark of an in- 

 fested tree this insect is 

 better known as the Shot-hole 

 Borer. The group is, without 

 doubt, the most important 



FIG. 95, Engraver Beetles 

 (Scolytoidea). Work of these 

 forms is shown in Fig. 96. 

 Enlarged. 



FIG. 96. Work of Engraver- 

 beetle (Scolytoidea). 



