74 



INSECTS 



to wind storms. Some of our own carpenter worms 

 make simpler borings; but owing to their methods 

 of work, leave sore spots that often form points of en- 

 trance for germs of decay. Thousands of oak trees in 

 the eastern United States are "doated" as the result 



FIG. 30. Wood-leopard moth, Zeuzera pyrina: a, b, larva; c, male; d, female 

 moth; e, larva burrow. 



of the work of these borers; stunted in growth and 

 useless as timber. Fortunately the number of species 

 is small and very few of them are at all numerous in 

 specimens. 



The Hepialids are very ancient in type and they 

 are few in number of species and specimens. The 

 larvae are large and make large channels in roots and 



