34 College of Forestry. 
Tue Kees.— The first few eggs were deposited during 
the next twenty-four hours as several were in position when 
the bark was opened farther on March 24th at 2:00 Pp. m. 
It is probable the first egg was placed within a few hours 
of the time copulation was observed as it was about 4 mm. 
from the nuptial chamber, while the depth of the egg gallery 
at the time copulation occurred was between 41% and 5 
mm. It is known that in other cases the egg gallery extends 
only a half millimeter at most beyond the egg niche when 
the egg is laid. The eggs are placed in little hemispherical 
niches or depressions gouged out of the sides of the egg 
gallery by the female. ‘The niches are considerably more 
than half in the sapwood. The egg is placed so that the 
center is just below the level of the juncture of bark and 
sapwood. Each egg is packed in with frass held together 
by some sticky substance, probably a secretion of the female. 
For several hours this substance does not harden but 
remains sticky and can be drawn out into a thread on the 
point of a needle. Later it hardens slightly and on the 
needle being brought into contact with the plug of frass, a 
portion of this will adhere. The eggs themselves are oval 
in shape about .537—662 mm. in length by .400—.425 mm. 
in width and are usually though not invariably placed 
crosswise of the egg-niche with their long diameter parallel 
to the egg gallery (Fig. 25). When first laid and for 
several days afterward they are pure white in color with 
a pearly luster. 
On March 25th at 2:00 p. mM. just two days after copula- 
tion was observed the male in “ burrow H” was acciden- 
tally killed while opening the burrow. The female, how- 
ever, continued to lay eggs for a period of ten days in all, 
in spite of the absence of the male. The last few days of 
this period, however, her egg laying was at a diminished 
rate, as shown by the smaller amount of frass excavated. 
Finally after April 2nd no more frass was thrown out, 
showing that no more eggs were being laid, although the 
female remained in the burrow till April 8th when she 
left the burrow and was seen no more. During the period 
