BEETLES OR COLEOPTERA. 



41 



LESSON XVII. 



REVIEW OF TERMS USED IN DESCRIBING THE METAMOR- 

 PHOSES OF INSECTS. 



Kinds of Metamorphosis. 



/. Development without metamorphosis. 



This has not been described in these 

 lessons, and it occurs only in a single 

 order of insects, the Thysanura (see 

 page 63). 



//. Incomplete metamorphosis. 



III. Complete metamorphosis. 



Names of Stages. 



Egg. 

 • Immature insect. 

 Adult. 



r Egg. 



\ Nymph (several stages). 



L Adult or imago. 



'Egg. 

 Larva. 

 Pupa. (The pupa is 



sometimes inclosed 



in a cocoon^ 

 Adult or imago. 



LESSON XVIII. 



BEETLES OR COLEOPTERA (Co-le-op'te-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 



