CLASSIFICATION OF INSECTS. 



List of Orders of the 



THYSANURA. 



EPHEMERIDA. 



O DON ATA. 



PLECOPTERA. 



ISOPTERA. 



CORRODENTIA. 



MALLOPHAGA. 



EUPLEXOPTERA. 



ORTHOPTERA 



PHYSOPODA. 



Hexapoda. 



HEMIPTERA. 



NEUROPTERA. 



MECOPTERA. 



TRICHOPTERA. 



LEPIDOPTERA. 



DIPTERA. 



SlPHONAPTERA. 



COLEOPTERA. 

 HYMENOPTERA. 



Order THYSANURA (Thys-a-nu'ra). 

 BristletailS) Springtails, Fish-moths, and others. 



The members of this order are wingless insects wJiich 

 undergo no metamorphosis, the larval form being retained 

 ~by the adult. The mandibles and max- 

 illcB are retracted within the cavity of 

 the head, so that only their tips are 

 visible ; they have, however, some free- 

 dom of motion, and can be used for 

 biting and chewing soft substances. 

 True compound eyes are rarely present ; 

 but in some genera there is a group of 

 simple eyes on each side of the head. 

 The abdomen is sometimes furnisJied 

 with rudimentary legs. 



A familiar example of this order 

 is the fish-moth (Fig. 33), which 

 often does damage to starched cloth- 

 ing, bookbindings, and sometimes 

 loosens wall paper by eating: out * IG - 33- The fish- 



., , i . - i. moth. 



the paste. The hair line at the 

 left of the figure indicates the length of the insect. 

 The fish-moth is one of the bristletails, which are 



