THE ROUNDHEADED APPLE-TREE BORER. 9 
THE ADULT. 
The borer attains the adult stage 10 days or 2 weeks before it leaves 
the pupal chamber. When ready to issue it gnaws a circular hole 
through the bark (fig. 14) and escapes. 
The beetles average about three-fourths of an inch in length, 
exclusive of the antenne. The color is light brown above with 
Fic. 9.—Roundheaded apple-tree borer. Fic, 10.—Roundheaded apple-tree borer. 
First summer in tree. Natural size. Second summer in tree. Natural size, 
(Original.) (Original. ) 
twe broad, white bands, joined in front, extending the full length 
of the back; the underparts and front of the head are white. The 
female is larger than the male, the body being thicker and heavier. 
(Fig. 15.) 
All the beetles in a given locality issue from the trees within a 
period of two or three weeks. After they emerge they seek the 
branches of the trees, where they spend the greater part of their lives 
93003°—Bull. 675—15——2 
