30 



PLANT-BUGS INJURIOUS TO COTTON BOLLS. 



tion to the foregoing lived, 6, 34, and 125 days, respectively, but 

 deposited no eggs. 



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. 



When 

 collected. 



Where collected. 



Num- 

 ber of 



Total 

 num- 

 ber of 



Average number of eggs deposited per 

 insect per day. 





females. 



eggs de- 

 posited. 



July, Aug. 



Sept. 



Oct. 



Nov. 



Total. 



A 



1905. 

 July 6-10....' Tlahualilo, Mexico. 



Aug. 11-12. . Barstow, Tex 



Sept. 12 do 



Oct. 13 do 



21 

 a 10 



2,755 



592 



1,271 







j 



2.74 ! 3.05 

 4.6 



0.51 

 .57 





 

 1.56 





 

 

 



1.92 



B 



2.5 



c 





6.27 



5.4 



D 



















1 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 Number of 



1905 



July 11-15 



July 16-20 



July 21-25 



July 26-30 



F. 



82.6 

 75.3 



78.1 



