KEY TO THE ORDERS 



291 



BBB. Trochanters undivided : abdomen composed of six or 

 seven visible segments; female with retractile sting. 

 (Aculeata.) 



C. Body with hairs on it more or less plumose. Apidae. 



(Bees.) 

 CC. Hairs of body not plumose. 



D.- First abdominal segment (and sometimes second also) 

 forming a knot or node on upper side. Formicidae. 



(Ants.) 



DD. First and second abdominal segments without knot 

 or node. 

 E. Wings folded in plaits when at rest. 



F. Tibiae of the middle legs with a single terminal 

 spur, tarsal claws bearing a tooth. Eumenidae. 



(Solitary Wasps.) 



FF. Tibiae of the middle legs with two terminal spurs ; 

 tarsal claws not toothed. Vespidae. 



( Social Wasps ; Hornets.) 

 EE. Wings not folded in plaits when at rest. 



F. Pronotum extending back on sides to the tegulse. 

 (See Fig. 217.) 



P t 



FIG. 217. Drawn from 

 specimen, by Miss M. E. 

 Wise. 



FIG. 218. Drawn from speci- 

 men, by Miss M. E. Wise. 



G. Legs of normal length ; many wingless forms. 



Scoliidae. 

 (Underground Stingers.) 



GG. Legs very long; no wingless forms. 



Pompilidae. 

 (Runners.) 



FF. Pronotum not extending back to the tegulse. No 



wingless forms. (Fig. 218.) Sphegidae. 



( Thread-waisted Wasps; Mud-daubers.) 



