10 GUIDE TO ORTHOPTERA 



&. Ocelli variable ; tarsi three-jointed, those of the fore legs 

 or else of the hind legs differing from the others in structure ; 

 fore coxae longer than broad ; middle field of tegmina in 

 repose, like the anal field, nearly or quite horizontal * ; base 

 of male tegmina (when present) furnished on the dorsal 

 surface with a tympanum (rarely absent) extending across 

 both anal and median areas, crossed by a prominent uervure 

 formed by the main anal vein, and as a whole broader than 

 the rest of the tegmen (except in Gryltotalpinae) ; ovipos- 

 itor (unless, as rarely, concealed) forming a nearly cyUn- 

 drical straight or occasionally upcurved needle, the inner 

 valves generally scarcely exposed except at the expanded tip. 



Geyllidae. 



*The Asiatic Schizodactylus is a curious example of a Locustid, with an enor- 

 mously developed and horizontal anal field, giving it the aspect of a Gryllid. 



