uo 



IKJUEIOUS IN'SECTS 



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 Eound-headed Apple-Tree Borer, in contra- 

 distinction to the flat-headed species next treated of. 



b c 



Fig. 94. — KOxraD-HEADED APPLE-TREE BORER (Saperda bivUtata, Say.) 

 a, Larva ; 6, 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 

 t'.e 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 

 hirva, and has transverse rows of minute teeth on the 

 back, and a few at the extremity of the bodv; 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 



