380 Trans. Acad. Sci. of St. Louis 
It was mentioned above that the lowermost 21% inches 
of the tunnel contained eight cells which gave forth eight 
perfect females, Above this series were eleven more cells 
of about the same size, with partitions of the same mate- 
rial and thickness. The masses of dried and mouldy ma- 
terial in these cells were placed under the microscope, 
and found to be the following, numbering the cells from 
the bottom upward: 
No. 9—A few dried aphids. 
No. 10—Dead larvae. 
No. 11—Dried aphids. 
No. 12—Empty cell from which one of the males had 
emerged. 
No. 13—Two aphids. 
No. 14—Three aphids. 
No. 15—Eleven small aphids. 
No. 16—Sixteen small aphids. 
No. 17—Empty cell whence the other male had 
emerged. 
No. 18—Twenty aphids. 
No. 19—Twenty-three aphids, 
On top of the nineteenth cell was a sawdust plug of 
fine material, 14-inch thick. The remaining inch of 
Space above this had been used by some other Hymenop- 
teron that had emerged probably late in the summer, 
while the inmates below were destined to gladden the 
earth the following spring. 
This series is of high interest since the females, eight 
in number, emerged from the bottom of the tunnel, while 
the two males from the top were at a much earlier date. 
It is also of interest because there was no mortality m 
the lower cells, the first constructed, while nine of the 
eleven in the upper portion gave forth no life. Whether 
this may have been due to the forgetfulness of the mother 
