A GRASSHOPPER 19 
a pair of nerve connectives passes to the dorsally situated 
supracsophageal ganglion or brain. The brain is the largest 
ganglionic mass in the body and is situated in the top of the 
head between the eyes. Lay bare the brain. Notice the 
optic lobes going to the eyes, and between them the much smaller 
ocellar lobes sending nerves to the lateral ocelli. Beneath the 
optic lobes are the antennal lobes, which send nerves to the 
antenne, while near them in the median line is the median 
ocellar lobe, which sends a nerve to the median ocellus. 
Exercise 17. Make a large sketch of the nervous system, repre- 
senting it in an outline of the animal’s body, and show in 
which segments the different ganglia occur. 
Exercise 18. Draw a diagram representing a side view of a 
grasshopper on a scale of 3 or 4, in which the segmenta- 
tion, the relative position of the heart, the alimentary 
tract, and the nervous system are accurately indicated. 
