STUDIES OF INSECTS 23 



7. What modes of locomotion do you observe in this 

 insect ? Which is the most common? If it flies or jumps, 

 note the distance. 



8. If you find the young, note whether they differ from 

 the adult in general appearance, and if so, in what ways 

 they differ. Do they differ in food ? 



9. What other insects do you find in the same habitat ? 



2. A STUDY OF GRASSHOPPERS (LOCUSTS) 



Insects adapted to Life in Grassy Meadows and Fields 



Materials. 



Both living and dead specimens of grasshoppers. Vari- 

 ous stages of young grasshoppers either dead or living. 

 Some mounted specimens with wings spread. The wings 

 of grasshoppers mounted in pairs between two glass slides 

 for use with microscope or hand lens. Mounted prepa- 

 rations of mouth parts and tracheae. 



Definitions. 



Orthoptera, straight-winged insects, order to which belong 

 grasshoppers, locusts, katydids, crickets, cockroaches, etc. 



Vivarium, a cage in which living animals are kept. 



Anterior, toward the head of an animal. 



Posterior, opposite to anterior. 



Dorsal, the upper surface of an animal. 



Ventral, opposite to dorsal. 



Regions, principal divisions of the body of an animal. 



Head, thorax, and abdomen, the three distinct regions 

 into which the body of a grasshopper is divided. 



Somite, a ring-like division of the body of an animal. 



Prothorax, mesothorax, and metathorax, the three divisions 



