I5RIT1S11 ORTHOPTEEA. 



4. The cubitn*. This and the previous one replace what 

 were known as the two branches of the median, or the anterior 

 and posterior uinar nervures. 



5. The first anal nervure, in the region where the elytron is 

 divided into anterior and anal parts. 



6. The remaining anal nervures, filling the anal area. 



The areas thus formed are : 



1. That between the margin and the subcosta, sometimes 

 called the mediastinal. 



2. That between the snbcosta and the radius, sometimes 

 called the scapular. 



3. The median between the radius and the first anal ner- 

 vure, which mav be subdivided if necessary. 



*/ t/ 



4. The anal area, comprising the rest of the elytron. 



In the wing the principal nervures hold the same 

 relative positions. The anal area, which at rest is 

 folded longitudinally like a fan, often occupies more 

 than half the wing and is much more delicate in struc- 

 ture than the anterior part, which in texture resembles, 

 to a great extent, the elytron. Wings and elytra are 

 both well filled with branches of the several nervures. 

 It should be noticed that when the alar organs are 

 folded there is no mid-dorsal suture, but the left 

 elytron overlaps the right. In the wing of Ectobius 

 (and some other genera) there is a small " apical 

 triangular area," which gives the wing a distinctive 

 appearance. This area folds independently of the rest 

 of the wing (see fig. 14). 



In each sex there appear to be ten abdominal seg- 

 ments, besides a couple of " podical plates," lying one 

 on each side of the anus, which, according to Huxley, 

 may represent the dorsal part of an eleventh. The 

 first segment is rudimentary, especially the ventral 

 plate. In the female the 8th and 9th segments are 

 visible only when the abdomen is distended. In the 

 same sex the ventral plate of the 7th segment is of 

 large size, and in the hinder part boat-shaped to assist 

 in the .discharge of the ootheca. The ventral plate 

 of the 7th segment is called the lamina subyenitalis ; 

 in the male the ventral plate of the 9th segment 



