STRUCTUBB. 



[For comparison figures of the labium of a Mantis {Ilierodala) 

 iind of a Phasgonurid (Agrcccia) are here given.] 



Fig. 4. — (A) Labium of Hicrodula ; (B) labium of Jgrcecia, 



The antennte are comparatively short, with not more than 

 twenty-four joints. The first joint, or scape, is generally 

 stouter and longer than the second, vvliich is often more or 

 less globular, and is sometimes called the ring-joint. The 

 remaining joints form the flagellum • they are sometimes long 



Fig. 5. — Anteniiffi of (A) Locusia, (B) GompJiocerm, (C) Acrlda. 



and uniformly cylindrical ; sometimes the flagellum is much 

 thickened towards the base and tapers more or less towards the 

 extremity ; and more rarely the joints of the flagellum are 

 tiattened ; or some of the terminal joints are expanded or even 

 form a club. 



The pronotum is generally as broad a^ the head, and its front 

 edge sligiitly overlaps it. It is usually truncated or rounded 

 behind, but is sometimes continued into a long process posteriorly, 

 especially in the Acbydiin.e, in which it frequently extends not 

 only beyond the abdomen, but even covers the ^^•hole of the wings. 

 The pronotum above is sometimes flattened, in which case there 

 is generally a central carina and two lateral carinas, [u other 

 cases tlie pronotum is cylindrical and arched above, when the 



