BIOLOGICAL STUDIES ON THREE APHIDID^. 



129 



VIVIPAROUS GENERATION. 



In 1906, between April 18 and October 3, 128 individual experi- 

 ments Avere carried on with viviparous females, and the following 

 averages are taken from the entire number of experiments (see Table 

 III): 



Table III. 



-Data of individual crperiiiicnts loith Aphis maidi-radicis, viviparous 

 generation, 1906. 



61017— No. 12, pt 8- 



