84 INSECTA 



(3) The Esophagus, a short tube leading into the crop. 



Use? 



(4) The Crop. Note where the esophagus begins to en- 



large. 



(a) Size? 



(b) Shape? 



(c) Use? 



(5) The Salivary Glands, grape-like or mulberry-like clus- 



ters about the crop. 

 Use? 



(6) The Gastric Ceca (in the grasshopper) are small worm- 



like appendages back of the crop. 



(a) Number? 



(b) To what attached? 



(c) Use? 



(7) The Stomach. Just back of the gastric cseca the ali- 



mentary canal enlarges into the true stomach. 



(a) Shape? 



(b) Size? 



(c) Use? 



(8) The Malpighian Tubes are long, small, tubular organs 



at the posterior end of the stomach. 



(a) Color? 



(b) Size? 



(c) Shape? 



(d) Use? 



(9) The Intestines. 



(a) Straight or coiled? 



(b) Use? 



(c) In what segment do they terminate? 



(10) Diagram or sketch the alimentary tube of the grass- 

 hopper, and name its parts in order from the mouth 

 to the vent. 

 5. The Nervous System. Look for a white cord along the 

 floor of the abdomen. 



(1) Is the cord single or double? 



(2) How many ganglia to a segment? 



(3) How many ganglia in all? 



(4) Trace nerves to the legs. 



