34 ANIMAL ACTIVITIES. 
Do you find a tongue ? 
Do you find a pair of softer jaws (maxillz) behind 
the mandibles? Sketch. 
What is the shape of the lower lip (labium) ? 
Do any of the mouth-parts have feelers (palpi) ? 
Where situated? How many ? 
Does the insect bite or suck its food? Notice the 
movements of its mouth-parts. 
Touch gently the grasshopper’s feelers with a tooth- 
pick or stick. Touch in the same way other parts of 
the body. Where is it most sensitive to touch ? 
How far can a grasshopper see? How do you 
determine this? Can the grasshopper hear? Give a 
reason for your answer. Does the grasshopper have 
the sense of smell ? 
What can you now say about the grasshopper’s 
mode of taking food ? its respiration ? locomotion ? its 
organs of sense or discovery ? 
Summary of Drawings. (a) Side view of abdomen 
XxX 5- 
(6) Sketch of one of the second and one of the third 
pair of legs x 5. 
The parts of the leg. beginning at their union with 
the body, are coxa, trochanter, femur, tibia, and tarsus. 
Indicate these parts in your drawing. 
(¢) Sketch of front and hind wings X 5. 
(@) Side view of a grasshopper’s head X 5. 
(e) Sketch of mandible xX Io. 
(7) Sketch of maxilla x Io. 
(g) Sketch of upper lip X 20. 
(2) Section of compound eye (microscope). 
Internal Structure. If we wish to examine the 
internal structure of a grasshopper, we may prepare 
specimens by hardening them in alcohol. This changes 
the color and to some extent alters the size and general 
appearance of the organs. On this account it is well 
to examine a freshly killed specimen along with the 
alcoholic specimen for purposes of comparison, 
