MARINE ARTHROPODS 305 



Class MYRIOPODA. 



Order Chilopoda Centipedes. 



Order Chilognatha Millepedes. 

 Class INSECTA. 



Order Ehynchota Imperfect metamorphoses, suctorial mouth. 



Order Thysanura Imperfect metamorphoses. No wings. 



Divided tail. Spring-tails. 



Order Euplexoptera Abdomen with terminal forceps. Earwigs. 

 Order Thysanoptera Four equal membranous wings. Thrips. 

 Order Orthoptera Anterior wings usually shorter and firmer. 



Grasshoppers, &c. 



Order Neuroptera Two pairs of glassy wings equal. 

 Order Trichoptera Wings unequal, clad with hairs or scales. 



Caddis flies. 



Order Aphaniptera No wings, no compound eyes. Fleas. 

 Order Diptera Two membranous wings. Flies. 

 Order Lepidoptera Wings clad with scales. Butterflies and 



Moths. 



Order Coleoptera Fore wings hard and horny. Beetles. 

 Order Hymenoptera Four membranous wings. Larva, footless 



grubs. Ants, Bees, &c. 



