FIG. 127. Nymph of a damsel-fly 

 (Lestes sp.). (Twice natural size) 



Showing the three leaflike tracheal 



gills at the tip of the abdomen. (After 



Kellogg) 



FIG. 128. Early stages of nymph of a 

 dragon-fly (Anax junius Dru.). (All en- 

 larged) 



Showing changes of color pattern : A, newly 



hatched ; , one fourth grown ; C, one half 



grown. (After Needham) 



FIG. 129. A dragon-fly and its development 



Nymphs feeding at / and j, showing extension of underlip or mask and the way prey is 



grasped by it ; 2, mature nymph ready to molt ; 4, skin of nymph from which the adult ( j) 



has emerged. (After Brehm) 



99 



