50 College of Forestry 
normally two females and one male occur in a brood burrow. 
The beetles breed by preference in tops, 2. e., in the upper 
part of the trunk among the limbs where the bark is thin 
but they may occur anywhere in the trunk or limbs. When 
in the trunk, the entrance gallery leads from the outside 
obliquely upwards through the bark to the nuptial chamber 
which is excavated nearly entirely from the sapwood. This 
is usually roughly triangular in shape with one of the angles 
continuous with the entrance and the other two above. 
The first egg-gallery constructed is apparently invariably 
upward, proceeding with the grain of the wood from one of 
the upper angles of the nuptial chamber (Figs. 9, 10). The 
second egg-gallery starts from the other upper angle, but 
immediately turns downward and as soon as it clears the 
nuptial chamber proceeds nearly, but usually not exactly 
parallel with the grain of the wood in a direction opposite 
the first gallery (Figs. 7,8). When a third gallery is present 
it arises from the side of the nuptial chamber opposite to the 
second, turns outward and downward nearly with the grain 
of the wood but diverging shghtly (Iigs. 7, 9). 
It is interesting to note that the upper egg-gallery, 2. e., the 
one first constructed, is longer (or longest) in sixty per cent 
of burrows having two or three galleries. In seventy-three 
per cent the upper gallery contains the larger number of 
ege-niches, showing a greater fecundity of the female first 
fertilized over those fertilized later. This data is based on 
careful measurements and counts of one hundred brood bur- 
rows. J urther study shows that the average length of the 
first (upper) egg-galleries is 80.34 m.m. and of the latter 
ones is 23.67 m.m.; the average number of egg niches in 
the first egg-galleries is 38.12 and of the lower only 24.75. 
In gathering this data burrows having three galleries were 
used as well as those having two, and in the former cases 
both lower galleries were included. It might be objected 
that this would seem unfair as one of the three is so likely 
to be abnormal, it being logical that if the second contains 
fewer eggs than the first, the third would contain fewer than 
the second. There being no way to determine which of the 
