9 Q THE SPEI a^-APHTS OE * * GKF.F.X BI 



Tabulated, the results of Mr. Yiekery's reaiings are as follows : 



Table IX. — Experiments with 5 viviparous females of Taroptera graminum to determine 

 minimum temperature at which reproduction will take place. Richmond, Ind., 

 December. 1908. 



'->-■ 





-' "_';-r-" 



::'7.— i 



« . - ^ 



• • - - - 







! Dec 3 



-. 

 5 

 6 



•J. 



,. 



V. 



: : 



m F. 

 45 

 41 



'i 

 | 





 1 



! 

 \ 



. ~ r •■ 



mperature increased so that con- 



After December 9 the oute 

 trol indoors was not possible. 



At Dallas. Tex.. January 3 to 14, out of doors and under natural 

 conditions, with thermometer within a few feet of the five female 

 ::»ptera 1 to 3 days after maturity, Mr. Urbahns found that 

 young were produced as follow 



Table X. — Experiments with 5 viviparous females of Toxoptera graminum to determine 

 minimum temperature at which reproduction will tale place. Dallas, Tex., January, 



: ? : • . 





_ 





:•-.-.-•-- .:' --.:-.: ---.-■■-. ~ 





r 



- _ . _. . 



_ i:r 











ri.:.. _r. ..— ___. 





-. ,- _ 

















m F. 















r.v:: 



Jan. 3 



O 



-^ 



1 



1 



1 



1 





5 



1 



: : 





3 



3 



1 



5 





16 



5 



37 



■ 



3 



3 



1 



- 





11 



J 



- 



ii 















t 











21 



: 



























8 



.'■ 



45 

























9 



« 



-, 



1 



2 







3 



4 



13 



:: 



37 





, 





0) 



3 



= 



1: 



u 



14 



15 



o 



















:: 



:: 



a 













o 









13 



:: 



32 







I 









f 



14 



.- 



n 



: 



o 











\j 



-~ : 



3 



'--- 



Id 





■Z.--. 



