GRASSHOPPERS AND CRICKETS . 35 
For the purpose of dissection a female grasshopper 
should be pinned to the bottom of a dissecting-pan and 
covered with water. The dorsal wall of the abdomen 
should then be cut away with a pair of scissors, care 
being taken to notice the delicate tube, the heart, lying 
along the back. In the freshly killed specimens, the 
Fig. 38. —The Parts of a Locust, a, head; b , eye; c, antenna; d,f, i, 
thorax; ab, abdomen. 
tracheae, or air-tubes, connecting with the spiracles on 
the outside, and ramifying to all parts of the body, 
may be easily seen. At the same time a cluster of 
long, oval, yellow eggs may be seerf on each side of 
the body, near the anterior part of the abdomen. From 
these a tube, the oviduct, leads backward to the ovi¬ 
positors. Below the heart the digestive canal may be 
