KATYDIDS INJURIOUS TO ORANGES IN CALIFORNIA. 
13 
the usual number of eggs, from 1 to 3, are laid overnight, at which 
time oviposition mostly occurs. Oviposition decreases during the 
fall months and usually ceases entirely about midwinter. Females 
which have ceased to oviposit in winter may be induced to begin 
again by placing them in an artificially warmed atmosphere. Thus, 
one of a number of females which had ceased to oviposit about the 
middle of November, when taken from a temperature of 40° F., early 
in December, and placed in a room heated to 75° F., began to oviposit 
and laid 8 eggs in the course of an hour. A single female in the course 
of her life deposits, on an average, about 175 eggs. Infrequently 
individuals held in captivity from the middle of July to the following 
December have deposited about 230 eggs. The following complete 
individual records were obtained from specimens which emerged in 
captivity and were kept there, under nearly field conditions, until 
death: 
Table I. — Oviposition record of the fork-tailed katydid, Lindsay, Cal., 1912. 
No. of 
specimen. 
Number 
of eggs 
deposited. 
No. of 
specimen. 
Number 
of eggs 
deposited. 
1 
169 
10 
206 
2 
172 
11 
74 
3 
121 
12 
140 
4 
174 
13 
230 
5 
114 
14 
87 
6 
64 
15 
142 
7 
78 
16 
239 
8 
132 
17 
61 
9 
57 
18 
159 
Most of the eggs of this species are deposited during the period 
from the latter part of July to the last of September, though ovipo- 
sition still occurs as late as the first week in December in warm 
winters, and adults have been found ovipositing as early as June 18. 
LENGTH OF LIFE OF ADULTS. 
Adults reared in screened cages, protected from their natural 
enemies and given an abundance of fresh food daily , lived, on an 
average, 125 days, or a little over four months. In a few exceptional 
cases individuals lived from 150 to 160 days — 162 days in the case 
of a single specimen being the record longevity. 
ENEMIES OF THE ADULT. 
Birds undoubtedly play an important part in reducing the num- 
ber of adults each year. Under field conditions adults are less 
numerous in October and November than in July and August, yet 
specimens protected by large screen cages live through October and 
most of November as actively as during the first few weeks of their 
adult life. In certain orchards where the infestation was particu- 
