PLATE XIX. 

 AQUATIC HETEROPTERA, 



1. Ranatra linearis. 



2. Notonecta glauca 



3. Nepa cinerea. 



Plants : — 



Duckweed (Ze?«»o). On surface of water. 

 Various-leaved Pondweed {Potamogeton heterophylliu). 

 Starwort (Aster tripohum). 



