ORTHOPTERA 



38 



like a fan when the insect is at rest; and the abdomen, which 

 in the female terminates in two pairs of sharp-hooked 

 spines forming the ovipositor or egg-depositing apparatus. 

 The thorax and abdomen are composed of ringlike portions, 

 called somites, of which the three in the thorax are named 

 prothorax, mesothorax, and metathorax. The part of the 

 somite on top is the tergum, that underneath is the 

 sternum, and on the sides are the pleura. Eleven somites 



FIG. 9. Locust with the left wing w cut off near the base, a, antennae ; d, ear ; 

 e, compound eye ; /, femur ; J, labrum ; m, maxilla ; n, front leg of right side ; 

 o, mandible ; p t palpus of right maxilla ; r, tarsus ; s, segments of the abdo- 

 men ; t t tibia ; tr, trochanter ; photograph, natural size. 



are present in the abdomen, and the dorsal (upper) and 

 ventral (under) part of each is composed of a single plate 

 named the tergite and sternite, respectively. The sternites 

 of the last three somites are wanting in the female. 



Each leg is composed of a short proximal segment, the 

 trochanter; a second segment, stout and long, known as the 

 femur; a third segment, long and slender, called tibia, and 

 a terminal portion made of several pieces forming the 



