(As RoBerRT MATHESON 
remain permanently in any one place. They may feed for a short time 
and then move about, locating a new place to obtain food or migrating to 
the twigs and depositing eggs. After each egg deposition the female 
returns to feed, and several days are usually occupied in the important 
process of egg laying. During all this time the few males that may be 
present actively mate with the females. In general, however, it may 
be said that only a small number of the females ever become fertilized, 
owing to the small number of males. Whether such non-fertilized 
eggs ever hatch has not been determined for this species, so far as is known. 
As to the number of eggs that a single female is capable of laying, no 
definite statements can be found in literature, each author contenting 
himself with the barren remark that a few are laid. In the fall of 1914 
a large number of experiments were conducted under normal outdoor 
conditions to determine this point. At the same time many dissections 
were made to confirm or deny the conclusions drawn from such experi- 
ments. 
The table on the following page shows in a graphic form the principal 
data obtained. 
From the table it is seen that the number of eggs laid varies considerably. 
Altho many females were experimented with, only a few seemed to act in 
a perfectly naturai manner. Furthermore, it was difficult to obtain nearly 
mature females that had not deposited eggs, and then find a sufficient 
number of males, without more extensive rearings than could be made 
under the prevailing conditions. It would appear, from the experimenting 
done, that in order to secure perfectly natural conditions it is necessary 
to include a male in each rearing cage. 
The egg-laying period extends over a considerable time. In 1914 the 
first eggs were deposited on October 6 and deposition continued to as 
late as December 1. The maximum egg deposition was reached about 
the latter part of October, yet many eggs were laid late in November. 
On November 17, 1914, a severe frost apparently froze all the females 
in the rearing cages. But when some of these were brought into the 
laboratory they revived and became active; while many of those left 
out of doors gradually revived, and active females were found as late as 
December 1. In 1915 egg deposition began on October 4, reached its 
maximum the latter part of the month, and continued intermittently 
until the end of November. 
