- Side view with the legs and wings removed. Label all parts shown in this drawing. (See [Definitions] on pages 23 and 24 for names of parts.)
- Face view of the head, showing the simple and compound eyes, the antennæ, labrum, and palps.
- One of the third pair of legs. Label parts.
- A fore and a hind wing arranged in natural position.
- A young grasshopper.
3. COMPARATIVE STUDY OF ORTHOPTERA
Materials.
Mounted specimens of various common species of orthoptera.
Observations.
- Where does the insect live? What is its color?
- What is the size and shape as compared with the grasshopper?
- What is the length of the antennæ as compared with the length of the body?
- To what kind of locomotion are the legs adapted? How? Are the forelegs specially adapted for grasping?
- What is the position of the wings when at rest? Are they large or small as compared with the size of the body?
- Are the ovipositors long or short? (Compare with those of the grasshopper.)
- Find the group to which the insect belongs and its name by the key in the following section.
4. KEY TO SOME COMMON ORTHOPTERA
A. Groups
| Legs | Antennæ | Other Characters | Groups |
|---|---|---|---|
| Similar, fitted for running | Long | Body flattened, wings folded on dorsal surface of the abdomen | Cockroaches (Blattidæ) |
| First pair of legs enlarged for grasping | Rather long | Prothorax long and slender, wings folded on dorsal surface of abdomen | Mantis (Mantidæ) |
| Similar, fitted for walking | Long | Body usually greatly elongated and stick-like, usually no wings | Walking stick (Phasmidæ) |
| Hind legs fitted for jumping | Short | Body somewhat compressed, wings folded on side of abdomen | Short-horned grasshoppers (Acrididæ) |
| Long | Body compressed, wings folded on sides, tarsus four-jointed | Long-horned grasshoppers (Locustidæ) | |
| Long | Body somewhat flattened, wings folded on the back, tarsus three-jointed | Crickets (Gryllidæ) |