XIV 

 INSECTS OF OTHER ORDERS 



We have now had before us the insects of eleven orders. 

 There are other orders* — just how many orders entomolo- 

 gists are not agreed. The others are all small groups, and 

 some of them are rarely collected. On land there are four 

 big orders that make up the bulk of the insect population — 

 Coleoptera, Lepidoptera, Diptera and Hymenoptera; and in 

 the water there is one that exceeds all other aquatics — the 

 Trichoptera. All these have complete metamorphosis, with 

 wormlike larvae, that are very different from the adults, 

 and that for the most part have different feeding habits. 

 The two most important groups having incomplete meta- 

 morphosis are the Orthoptera and the Hemiptera. Nearly 

 all the economic species of insects are members of these six 

 terrestrial groups. 



* A List of the Orders of Insects 



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