204. Report of THE DEPARTMENT OF ENTOMOLOGY OF THE 
being 4.5 mm. in length. It is more cylindrical, the abdominal 
segments being slightly swollen. ‘The latter have a pale brown 
color with a pinkish tint. 
Larva, May 19.— The appearance of the larva is the same as the 
younger stages. Some of the individuals begin to show a slight 
variation in size. The length ranges from 5 mm. to 6 mm. 
Larva, June 12.— The larvae show greater variation in size than 
was noted upon previous observations. Some members of the 
brood have apparently ceased to grow, while others have made 
a rapid growth. The larvae vary in length from 5 mm. to 
Il mm., the average length being about 8.5 mm. The larger 
specimens have begun to bore in the heart wood and in most 
cases have made a channel about one-half inch long. 
Larvae, June 21.— At this time the larvae shows still greater 
range in size, the length varying from 12.5 mm. in the larger 
specimens to 5 mm. in the smaller specimens. The largest 
larvae were ready to pupate. 
HABITS OF THE LARVA. 
Most of the eggs hatch between August 15 and October Tf, 
and the larva upon hatching begins to bore into and feed upon 
the cambium tissue. During the winter the larva remains dor- 
-mant, making very little growth until spring. There is no uni- 
formity in the shape of the larval borings or channels during 
the first months of activity. The larva may remain in one 
place, making a flat irregular shaped chamber, or sometimes a 
zigzag channel, though more often the cambium layer is girdled, 
either partly or entirely, depending on the size of the tree. At 
first the channel of the young larva is small and has but one 
opening in the bark, but as the larva increases in size, the 
channel is gradually enlarged and frequently another opening 
is made. 
The larva works in the cambium layer until within 3 or 4 
weeks of the time to pupate. It then bores at an angle into 
the woody tissue until the heart of the branch is reached, when 
the direction is changed upward. It can usually be determined 
whether the larva is working in the cambium layer or the 
woody tissue by the character of the larval chewings and parti- 
cles of excrement together with sap from the tree that appear 
as an exudation at the opening to the larval chamber. While _ 
the larva is in the cambium layer, the exudations are brown or 
