FEBRUARY. 43 



like halteres ; antennae much longer in the males than 

 in the females ; the latter have no wings ; body elon- 

 gated in the males, short and globose in the other sex ; 

 size very small. 



ORDER XI. HETEBOPTEBA, Latreille. 



Characters. Wings four, anterior pair larger than the poste- 

 rior, wrapping partly over each other ; basal part coriaceous, the 

 rest membranaceous ; antenna generally long and filiform ; mouth 

 arising from the front of the head. 



SECTION I. 



HYDROCORISA. Those residing in water. 



1. Notonectida. Hind legs long and hairy, forming a pair 



of oars ; fore legs short and curved, for catching their 

 prey ; elytra deflexed ; antennae inserted beneath the 

 eyes, and four-jointed ; rostrum short and thick, capa- 

 ble of inflicting a painful wound; body boat-shaped. 



2. Nepidce. Fore legs raptorial, formed for seizing their 



prey, the others made for creeping ; antennas short and 

 variable; rostrum short and robust; body depressed 

 and sometimes furnished with two long filaments ; 

 head small ; colour dull brown in both families. 



