72 



BRANCH ARTHROPODA. 



cupy so little time that the descendants from a single 



FIG. 121. 



FIG. 120. pair soon reach the millions.* 



The Bark-~borers cause 

 great destruction to trees by 

 digging, just beneath the 

 bark, radiating galleries 

 bearing a rude resemblance 

 to written characters. An 

 egg is placed at the termina- 

 tion of each gallery. 



The Weevils have a long 

 proboscis for boring holes in 



too- Ittm destructor. Bark-borer. wn ich to deposit their 6ggS. 



Different species attack different parts of plants. 



Balaninus (bal a nl'nus) is peculiar in that 

 its mandibles work vertically instead of hori- 

 zontally like those of other Weevils, and in- 

 deed all other Beetles. The so-called " worm," 

 found in chestnuts and in hickory-nuts, be- 

 longs to this genus. 



The May-beetle, or June- 11 bug," lays its 



eggs in the ground 

 during May or June. 

 These hatch in 

 about three months. 

 The larva, called by farmers the 



* A single female during a season may 

 attach, in groups of from ten to forty, as 

 many as one thousand eggs. These hatch in 

 a week's time. The larvae at once begin 

 feeding, and in fifteen or eighteen days equal 

 the parent in size. They now drop to the 

 ground and dig a small hole, in which they 

 They then come to the surface adult animals, 



FIG. 122. 



Hal a nl'nus nfl'- 

 cum. Weevil. 



Loch no sltr' na fus' ca. June-bug, 

 showing how the membranous wings 

 arc folded away. 



rest for about ten days as pupae. 



ready to lay more eggs, and so on. In the fall, some of the adults again return 

 jnto the ground, where they pass the winter. 



