140 



I]N'JUKTOUS IJTSECTS 



tent this insect is infesting the orchards in various local- 

 ities. A tree becomes unhealthy and eyentually dwindles 

 and dies^ often without the owner haying the least sus- 

 picion of the true cause — the gnawing worm within. 



At figure 94 this borer is represented in its three stages 

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

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

 striped Saperda, while its larya is best known by the 

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

 distinction to the flat-headed species next treated of. 



Fig. 94. — ROUND-HEADED APPLE-TREE BORER {Sapevda MvUtata, Say.) 

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



The average length of the larya, 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 

 larya, 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 



