INSECT NOTES FOR I9II. 247 



LIFE CYCLE OF PEMPHIGUS TESSELATA iacerifolii). 



Alder. 



NYMPHS (hibernating under leaves 

 Oct. to April; becoming 

 mature apterous vivipa- 

 rous parthenogenetic fe- 

 males, late June.) 



Maple. 

 EGGS (on bark over winter). 



STEM MOTHERS (mature Jxme 11) 



SECOND GENERATION (apterous vi- 

 viparous parthenogenetic 

 females mature mid July). 



<.. 



Migrates mid 1 ^^^^^ migrants (mature mid 



July to alder. 



July). 



THIRD GENERATION. 



Apterous vivi- ' A late viviparous 



parous parthe- parthenogenetic fe- 



nogenetic f e- males mature Sept. 



males, mature i ; fall migrants, 



Sept. I sexuparae, migrate Sept. i to maple. . 



APTEROUS OVIPAROUS FEMALES 

 AND APTEROUS MALES. 



NYMPHS (hibernating). 



EGGS (on bark over winter). 



