LOCUST 173 



come flexible and the drying of the specimen is pre- 

 vented by the glycerine. 



Let the student lay the specimen before him on the 

 table with the back uppermost and the head turned 

 away from him, and make out as many as possible of 

 the characters. Then the body may be studied in dif- 

 ferent positions, the appendages removed and examined, 

 longitudinal and transverse sections made, etc. 



Specimens may be killed by pouring a few drops of 

 chloroform, ether, or ammonia on the body. 



Living specimens may be placed for study in glass 

 jars or fruit-cans, into which a few blades of fresh grass 

 have been thrown. 



MOJBPHOLOGT 



a. The shape of the hody as a whole.- — "What is the gen- 

 eral shape? Does it resemble that of the cray- 

 fish or lobster ? Is the body bilaterally symmet- 

 rical ? Is the insect's shape at all related to its 

 mode of life 1 How many regions are there in the 

 body ? Compare with lobster and crayfish. How 

 distinguished from one another ? Are they more 

 or less plainly marked off from one another than 

 in the lobster or crayfish ? Do all of them bear 

 appendages ? Compare with crayfish. How many 

 pairs of appendages do you find? How many 

 kinds of appendages are there ? What character 

 have the appendages in common ? Is there an ex- 

 oskeleton ? If so, does it in any way resemble the 

 lobster's ? How many segments or indications of 

 such are to be found, without dissection, in each 

 region ? Compare with lobster. How long is 

 your specimen? Measure several specimens to 



