STRUCTURE. 



[Mauy species have them much abbreviated, in which case they 

 are most commonly oval or elliptical ; aud in some cases they are 



J I 



K k 



Pi„. 13. — '^tgxa^u oi ScM&tocerca : a, mediastinal Tein ; 6, scapular (humeral, 

 or anterior radial) ; c, middle radial (or discoidal) ; d, branch of 

 radial; c, posterior radial (or median); (/, intercalate ; /«, anterior 

 ulnar ; /, branch of ulnar ; j, posterior ulnar ; k, anal (or 

 dividens); I, axillary (or plicata). 



1, mediastinal area ; 2, scapular (or humeral) area ; 3, 4, anterior 

 and posterior intercalate spaces (discoidal of Brunner) ; 3 + 4, 

 median of Saussure ; 5, ulnar area ; 6, 7, anterior and posterior 

 axillary areas (Saussure) ; 7, anal area (Brunner). 



absent.] They are usually more or less opaque, especially 

 towards the base. 



The wings usually almost equal the tegmina in length, but are 

 much broader and are longitudinally folded. In most cases they 

 are hyaline or glassy, with darker nervures, but are sometimes 



Fig. 14. — Wing of Schistoccrca. The lettering as in figure 13. 



stained with red or yellow, or more rarely with blue or green. 

 IMie neuration will be better understood from the diagram than 

 from description. 



