326 INSECTS. 



TABLE OF HETEROPTERA. 



SECTION I. HYDROCORISA. 



Antennae short and concealed.* 

 Legs fitted for swimming.* 

 Ocelli wanting. 



A. Form boat-like. 

 Hind-legs long and oar-like. 

 Head about as wide as thorax. 



Family 1. Notonectidce. 

 Ex. Water Boatmen. 



B. Form flat and broad ; or linear. 

 Fore-leg prehensile. 



Head much narrower than thorax. 



Family 2. Nepidae. 

 Ex. Water Scorpion. 



SECTION II. AUROCORISA. 



Antennae long. 

 Legs fit for running. 

 Ocelli often present. 



* Aphelocheirus, an aquatic genus in the family Acanthidae, has these 

 characters of Hjdroeori e a. 



