TABLE OF HETEROPTERA. 327 



A. Terminal joint or joints, or joints of Antennae not 



more slender than those preceding. 

 Tarsi usually three-jointed. 



* Rostrum long, second joint elongated and straight. 

 Figure oval, flat. 



Family 1. Acanthidse. 



** Rostrum moderately long, four-jointed; third 



joint much longer than the rest. 

 Figure long, very slender. , 



Tarsi two- or three-jointed. 



Family 2. Hydrometridae. 



*** Rostrum short, three-jointed, buried in a groove 



under the head. 

 Tarsi two- or three-jointed. 

 Figure flat, broad. 



Family 3. Tingidse. 



**** Rostrum moderately long, joints nearly equal. 

 Figure generally narrow. 

 Ocelli sometimes wanting. 



Family 4. Lygaeidae. 



***** Rostrum long, four-jointed. 



Antennae long, often five-jointed. 

 Scutellum large. 



Family 5. Scutelleridaa. 



****** Rostrum moderately long ; third joint shorter 



than fourth. 



Antennae terminal joint large. 

 Tarsi three-jointed. 



Family 6. Coreidae. 



