AND OTHER INJURIOUS INSECTS OF I907 .VND I908. 49 



Insectary Notes: On Aug. 26th this species Ijred on wheat 

 in the insectary was in the ninth and tenth generations from the in- 

 dividuals first taken by Vickery in the spring (Apr. 23?). 



Pursuing the same plan as with the "green bug," taking the first 

 ofifspring of each generation, we found it averaged from fourteen to 

 sixteen young as follows : 

 A. 



young, Experiment No. 119 

 " 123 

 " 136 

 " 158 

 " 173 

 " 228 

 " 249 

 " 271 

 •• 352 

 " 2,72 

 " 402 

 " 413 

 •' " 422 



The 12th and 13th generations are still reproducing viviparously 

 as this is written (Oct. 19). Taking the first eleven generations of 

 Series A we have an average of about sixteen young from the first 

 ofifspring of each generation. 



P.. 



— 27 young. Experiment No. 120 



19—25 " " " 130 



5—38 " ■' " 157 



15— 2 ■• •' " 172 



26— 7 " " " 199 



7— 5 " " " 229 



14— 8 •' •' " 234 



29—19 " " " 269 



10— 7 " ■• " 317 



24— 1 " '■ •• 353 



11—9 " " " 391 



21—18 " " " 407 



5- * " " " 416 



The thirteenth generation is still producing young (Oct. 19) . Tak- 

 ing the first twelve generations of this series, we find that the average 

 number of voung from the first individual of each generation is 14, 

 and of both series, A and B, is 15. Comparing this with the average 

 of 50 obtained with the "green bug," one is at once struck with the 

 tremendous productiveness of the latter, far in excess of the "north- 

 ern" form, M. groiiaria. 



4 



