A. APTERYGOTA. 



1. COLLEMBOLA. 



Spring-tails. 



2. Thysanura. 



Bristle-tails. 



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B. PTERYGOTA. 



3. Dermaptera. 



Earwigs. 



4. Orthoptera. 



Cockroaches, Locusts, 

 Crickets, etc. 



5. Platyptera. 



Book-lice, Termites, 

 Stone-flies, etc. 



6. Thysanoptera. 



Thrips. 



7. Plectoptera. 



Mayflies. 



8. Odonata. 



Dragonflies. 



9. Hemiptera. 



Bugs, Cicadas, 

 Green-fl}', etc. 



10. Neuroptera. 



Alder-flies, 

 Lacewing-flies, etc. 



11. Coleoptera. 



Beetles. 



12. Trichoptera. 



Caddis-flies. 



13. Lepidoptera. 



Butterflies and Moths. 



14. DiPTERA. 



Flies, Fleas, 

 Sheep-ticks. 



15. Hymenoptera. 



Ants, Bees,Wasps, Saw- 

 flies, &c. 



HOMOMORPHA. 



Young animal re- 

 sembling adult in 

 general form but 

 distinguished by the 

 absence of wings 

 and external genital 

 armature. 



Heteromorpha. 



Larva? dift'ering 

 very greatly from 

 the adults and al- 

 ways passing into 

 a pupal stage. 



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