NATURAL HISTORY OF AQUATIC INSECTS en. 



FIG 104. 6, advanced larva of Gerris sp. with wing-cases and incomplete abdomen ; 

 7, larva, probably of wingless form ; 8, abdomen of half-winged imago ; 9, fore 

 tarsus, Uvo-jointed ; 10, n, extremities of lancets ; 12, inner pair of do., inter- 

 locking and forming a tube. 



