52 



EXTERNAL ANATOAIY. 



ments are not as complicated as they are at the extremities 

 of the bodv, the head and end of the abdomen. The long 

 and narrow body of a locust, laterally compressed, is like 

 that of all other true insects in their perfect state, divided 

 into three well marked regions, the head, thorax and abdo- 

 men. The head is flattened from before backwards, and 

 elongated verticallj^ It bears the eyes, the antennae and the 

 mouth-parts, and is movably joined, by a short neck, to the 

 second region of the body. The thorax forms, with the 

 head, the anterior half of the body. It carries on its lower 

 surface the three pairs of legs, which gradually increase in 

 size from before backward, the third pair being much 

 the largest. The two pairs of wings are fastened to the 

 posterior portion of the dorsal surface of the thorax. The 

 abdomen, a little longer than head and thorax com- 

 bined, is composed of a number of movable segments with- 

 out appendages. 



Fig. 22. — Front -view of Fig. 23. — Vertical view of Fig. 24. — Lateral view 

 the head of Melanoplus the head of Melaaophts of the headof i\ie/a«op/us 

 bivittatus. Original. bivittatus. Original. bivittatus. Original. 



The Head (Fig. 22, 23, 24 j.— The outer or dorsal sur- 

 face of the head consists of a very broad and long frontal 

 and a much smaller and shorter occipital area. The epi- 

 cranium {epic), which forms the covering of the dorsal occi- 

 pital area, becomes narrow and runs downwards between 



