84 ELEMENTARY LESSONS ON INSECTS 



III. In the caddisfly larva, note. 



1. The wormlike form. 



2. The heavily chitinized exposed parts and the soft mid- 

 body. 



3. The biting mouthparts. 



4. The short antennae and the small eyes. 



5. The strong legs directed well forward for protrusion 

 from the shelter-tube. 



6. The short tarsi. 



7. The spine-bearing front tibia. 



8. The absence of wings externally. 



9. The horny, rubbing surface underneath the last ab- 

 dominal segment. 



10. The gills in clusters underneath the body. 



11. The pair of false legs (prolegs) at the rear end of the 



body and the paired draghooks with which they are 

 armed. 



IV. With a variety of cases at hand observe. 



1. Their diversity in form. 



2. Their materials. 



3. Their manner of construction. 

 Note that they all have a lining of silk. 



