46 



MISCELLANEOUS PAPEES. 



LENGTH OF LIFE CYCLE. 



The life cycle is shown in Tables VI, VII, and VIII, including 

 the average mean temperature for the period. 



Table VI. — Length of life cycle of 44 individuals of Thripoctenus russelli. 



Total average mean temperature from August 13 to September 20, 05.08° F. 

 Total life cycle for the 44 specimens, 30 to .39 days. 



Table VII. — Length of life cycle of 4 individunls of Thripoctenus russelli. 



Total average mean temperature from August 14 to September 15, 05.90° F. 

 Total life cycle for the 4 specimens, 28 to ?,2 days. 



Table VIII. — Life cycle of Thripoctenus russelli in Thrips tabaci as a host, September 



and October, 1911. 



Total average mean temperature from August 28 to October 3, 64.7-1-° F. 

 Entire life cycle for the 4 specimens, 32 to 30 days. 



