228 



THE REPRODUCTIVE SYSTEM 



[CH. XI 



Damage to the sterns of the Blue Flag (Iris versicolor) has been 

 observed by Needham[99] owing to the numerous punctures made 

 by two species of Nearctic Lestinae. About one-fourth of the 

 fruiting stems are killed annually. 



Fig. 107. Egg-rope of Tetragoneuria cynosura Say. After Needham. 



Fig. 108. Eggs of Dragonflies. a, Austrolestes leda Selys ( x 15) ; b, Austropetolia 

 patricia Tillyard ( x 20). c, Petalura gigantea Leach ( x 20). d, Hemicordulia 

 tau Selys ( x 30) ; e, Diplacodes bipunctata Br. ( x 35). Original. 



Fig. 108 shews the forms of egg typical of the endophytic and 

 exophytic groups. 



