30 
PLANT-BUGS INJURIOUS TO COTTON BOLLS. 
tion to the foregoing lived 
deposited no eggs. 
6, 34, and 125 days, respectively, but 
REPRODUCTION. 
Monthly and daily rate of oviposition and relation to temperature. — 
Including all the female specimens of Pentatoma ligata upon which 
observations were made, the average daily rate of egg production 
was 1.45. Omitting the month of November, during which no eggs 
were deposited, the rate was 1.8 per day, while up to October 1 the 
rate was 2.4 per day. The more important data on egg deposition 
are summarized in the following table : 
Table IV. — Rate of egg deposition of the conchuela. 
Lot. 
collected. Where collected. 
Total Average number of eggs deposited per 
Num- 1 num- ! insect per day. 
ber of ber of 
females, eggs de- 
posited. July. Aug. Sept. 
Oct. 
Nov. 
Total. 
A 
1905. 
July 6-10. . . . Tlahualilo, Mexico. 
Aug. 1 1-12. . Barstow, Tex 
Sept. 12. . . .do 
21 2.755 2.74 3.05 0.51 
8 1 592 4. 6 .57 
14 1,271 6.27 


1.50 





1.92 
B... 
2.5 
c 
5.4 
D 
Oct. 13 . .do. . . 
a 10 . . 
U 
1 
a These insects were soft, indicating that they were newly matured. 
A study of the effect of temperature on egg production in the 
species here considered leads to the conclusion that the effective 
temperature as concerns egg-laying in the faunal region where these 
records were made, i. e., Lower Austral, is a little less than 75° F. 
The effect of temperature changes upon egg production is well illus- 
trated by the data given in the following table relating to insects of 
lot A referred to in Table IV: 
Table V. — Relation of temperature to egg-laying in. the conchuela. 
Period. 
Average NumbOT °' 
1905. 
July 11-15 
July 16-20 
July 21-25 
July 26-30 
82.i. 
67 
75.3 1 
11 
78.1 
61 
