58 
THE SCOLYTID BEETLES. 
the middle of June and that all are out by the last of July. Broods 
from eggs deposited by overwintered parent adults probably develop 
and emerge by the first or middle of June. 
FIRST GENERATION 
The overwintered young adults deposit their first eggs early in 
May, and the excavating of galleries and oviposition continue prob- 
ably into June, especially if the parent adults leave the completed 
galleries to excavate others, which they evidently do, though the 
general and principal attack by the overwintered broods is from the 
Fit,. 19.— The southern pine beetle. Egg galleries and larval rnine>: a, Entrance; 6, entrance burrow: 
c. egg gallery; d, normal larval mine; e, abnormal larval mine; /, terminal; g, ventilating bur- 
rows. Slightly reduced. (Authors illustration.) 
middle to the last of May. The larva? begin to hatch early in May 
and continue their active development during June, the more retarded 
individuals continuing active into August. They begin to trans- 
form to pupa? and adults about the middle of June, and continue until 
the retarded individuals are all transformed, in August or later. 
The developed broods begin to emerge toward the last of June and 
continue to come out during July or until all of the retarded broods 
and individuals are out in August and September or later: but 
practically all of the normally developed broods of the first generation 
are out by the last of July. 
