140 



INJURIOUS INSECTS 



tent this insect is infesting the orchards in various local- 

 ities. A tree becomes unhealthy and eventually dwindles 

 and dies, often without the owner having the least sus- 

 picion of the true cause the gnawing worm within. 



At figure 94 this borer is represented in its three stages 

 of larva (a), pupa (b), and perfect beetle (c). The bee- 

 tle may be known by the popular name of the Two- 

 striped Saperda, while its larva is best known by the 

 name of the Kound-headed Apple-Tree Borer, in contra- 

 distinction to the flat-headed species next treated of. 



Fig. 94. BOUND-HEADED APPLE-TREE BORER (Saperda UvUtata, Say.) 

 a, Larva; b.Pupa; c, Beetle. 



The average length of the larva, when full grown, is 

 about one inch, and the width of the first segment is not 

 quite one-fourth of an inch. Its color is light-yellow, 

 with a tawny-yellow spot of a more horny consistency on 

 the first segment, which, under a lens, is found to be 

 formed of a mass of dark-brown spots. The head is 

 chestnut-brown, polished and horny, and the jaws are 

 deep-black. The pupa is of rather lighter color than the 

 larva, and has transverse rows of minute teeth on the 

 back, and a few at the extremity of the body; the perfect 

 beetle has two longitudinal white stripes between three 

 of a light cinnamon-brown color. The Two-striped Sa- 

 perda makes its appearance in the beetle state during the 

 months of May and June, and is seldom seen by any but 



