98 QUINCE CULTURE. 
insect, in all its stages, will be readily recognized by the 
accompanying illustrations. 
During the months of May and June this beetle 
emerges through a round hole, haying completed all its 
changes from the egg to theimago. It comes out in the 
night, and hides during the day among the leaves, which 
are now its food. The sexes pair at night, after which 
the female deposits her eggs in the bark at the collar of 
the tree. The eggs are the size of a small pin-head, and 
may be looked for from May till August. Their entire 
life history embraces about three years. Within about 
| Nee tit 4 
| np 
Fig. 67.—Larva. Fig. 68.— Chrysalis. Fig. 69.—Lectle. 
ROUND-HEADED APPLE-TREE BORER. 
two weeks from the laying of the eggs, they hatch into a 
larva, which penetrates through the bark to the sap-wood 
the first season, where they form a burrow, and may 
often be detected by the discolored appearance of the 
bark of young trees, or by the fine-grained castings they 
have pushed out of their holes. They remain in the tree 
three years, becoming each year more destructive. Be- 
fore the end of this time, as they approach the comple- 
tion of their Jarval growth, they cut a passage through 
the heart-wood of the tree, extending it outward to the 
bark. These passages are cut very direct up to this 
point for a future exit, or they may be found turning 
abruptly back in any direction. With an instinct bor- 
