70 SCHOOL ENTOMOLOGY 



EE. Wing covers variable or absent. 

 F. Beak three-jointed. 



G. Common forms wingless. Bedbugs. 



Acanthiidce. 



GG. Generally winged. Not resembling bed- 

 bugs. 

 H. Front femora greatly thickened. 



Ambush-bugs. Phymatidcs. 

 HH. Front femora not thickened. As- 

 sassin-bugs. Reduviidce. 

 FF. Beak four-jointed. 



G. Front legs fitted for grasping. Wings 



rudimentary. N abides . 

 GG. Front legs fitted for walking. 



H. Membrane of wings without cells 

 but with a large number of more or 

 less interwoven veins. Coreidce. 

 HH. Membrane with few veins and usu- 

 ally with one or more closed cells 

 at the base. 



I. Membrane with four or five sim- 

 ple veins and sometimes with 

 one cell. Lygceidce. 

 II. Membrane with two or three 

 cells. Otherwise without veins. 

 Leaf-bugs. Capsidce. 

 DD. Antennae five-jointed. 



Stink-bugs. Pentatomidce. 



(Several other minor families having five-jointed antennae will 

 not be included here.) 



AA. Front wings of similar texture throughout. Sub-order 

 Homoptera. 



I. Size large; length greater than one-half inch. Cicadidce. 

 BB. Size smaller. 



C. Front wings slightly thickened or covered with a 

 waxy secretion. 



D. Prothorax projecting backward over the wings. 

 Tree-hoppers. Membraddos. 



