20 Lazvrence Bruner 



c. Second tarsal joint provided with a narrow lobe that is extended 



beneath the third Chelisochidae. 



cc. Second tarsal joint provided with a dilated lobe on each side. 



Forficulidae. 

 d. Sternal plates decidedly transverse (elytra rudimentary; ab- 

 domen depressed and dilated) ; pygidium transverse. 



Chelidurinae. 

 dd. Sternal plates not decidedly transverse. 



e. Antennal segments not very long and slender, the fourth 



often shorter than the third ; first much shorter than 



the head. 



/. Meso- and metasternum relatively broad ; pygidium 



broad. (Forceps not depressed; elytra perfect or 



abbreviated.) Anechurinae, 



//. Meso- and metasternum subquadrate or narrow ; pygid- 

 ium narrow. 



g. Abdomen depressed ; forceps flattened or cylin- 

 drical. (Mesosternum rounded posteriorly.) 



Forficulinae. 

 gg. Abdomen cylindrical, not depressed. 



h. Elytra not abbreviated ; mesosternum rounded 



posteriorly [Oriental genera] .. .Eudohrninae. 



hh. Elytra abbreviated; mesosternum truncate 



[American genera] Neolob'ophorinae. 



ec. Antennal segments all long and slender ; fourth not shorter 

 than third ; first longer and heavier than the others. 

 /. Sternal plates generally transverse, or at least rela- 

 tively broad ; metasternum truncate, transverse ; ab- 

 domen and forceps depressed Ancistrogastrinae. 



//. Sternal plates narrow ; metasternum narrow ; concave 

 posteriorly. 

 g. Abdomen not much depressed, surface rather con- 

 vex, legs long and slender ; pygidium narrow. 



Opisthocosmiinae. 



gg. Abdomen depressed and rather dilated ; legs short ; 



pygidium strongly transverse. . .Diaperasticinae. 



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