KEY TO THE ORDERS 



285 



AA. Abdomen composed of not more than six segments, the first 



being furnished with a ventral tube. Suborder Gollnnbohi. 



(Spriugtails.) 



ORTHOPTERA. 



A. Posterior femora fitted for walking, i. e., resembling those of 

 the other legs. Organs of flight of immature forms in normal 

 position. Insects mute. 



B. Anterior wings leathery, very short, without veins, meet- 

 ing in a straight line; posterior wings when present folded 

 to the middle of the anterior margin; tarsi three-jointed, the 

 pulvillus wanting; cerci horny, resembling forceps. 



Forficulidae. 



(Earwigs.) 



BB. Anterior wings parchment-like, thickly veined ; posterior 

 wings folded to the base, (except certain Phasnudac, which 

 are wingless); tarsi five-jointed; cerci soft, jointed or with- 

 out joints. 



C. Body oval, depressed; head wholly or almost wholly 

 withdrawn beneath the pronotum ; pronotum shield-like, 

 transverse; legs compressed; cerci jointed; rapid- 

 running insects. Blattidar. 



(Cockroaches.) 



CC. Body elongated; head free; pronotum elongated; 

 legs slender, rounded; cerci jointed or without joints; 

 walking insects. 



D. Front legs fitted for grasping; cerci jointed. 



Mantidae. 

 (Praying Mantis.) 



DD. Front legs simple; cerci without joints. 



Phasmidac. 

 (Walking-Sticks.) 



AA. Posterior femora fitted for jumping, i. r., very much stouter 

 or very much longer, or both stouter and longer, than the middle 

 femora; organs of flight of immature forms reversed; stridulat- 

 ing insects. 



B. Antenna 3 shorter than body; tarsi three- jointed ; organs of 

 hearing situated in the first abdominal segment; stridulat- 

 ing organs situated in hind femora and the costal area of 



the tegmina. Acrididac. 



( Grasshoppers.) 



BB. Antenna 1 longer than body, setaceous; tarsi four- or 



