BEETLES OR COLEOPTERA. 



LESSON XVII. 



REVIEW OF TERMS USED IN DESCRIBING THE METAMOR- 

 PHOSES OF INSECTS. 



KINDS OF METAMORPHOSIS. NAMES OF STAGES. 



/. Development Tvithout metamorphosis. 



This has not been described in these 

 lessons, and it occurs only in a single 

 order of insects, the Thysanura (see 



,- Immature insect. 

 Adult. 



page 63). 



[Egg. 



II. Incomplete metamorphosis. < Nymph (several stages). 



[_ Adult or imago. 



Egg- 

 Larva. 



Pupa. (The pupa is 

 sometimes inclosed 

 in a cocoon.} 

 Adult or imago. 



III. Complete metamorphosis. 



LESSON XVIII. 



BEETLES OR COLEOPTERA (Co-le-Op'tC-ra). 



While the pupils are observing the development 

 of the insects in their breeding cages, which will 

 probably require a long time, the work of making a 

 collection can be continued. 



1. Collect as many kinds of beetles as you can 

 and mount them as directed in Lesson XI. Beetles 

 can be found under stones and pieces of wood lying 

 on the ground, under the loose bark of dead trees, 

 logs, and stumps, and on the foliage of plants. 



2. The beetles, of which there are many thousand 

 kinds, constitute what is termed by naturalists an 

 Order. There are several orders of insects ; the one 

 composed of beetles is named the Coleoptera. This 



