CHAPTER VI 

 ARTHROPODA 



A. Terrestrial Arthropods breathing air by tracheal tubes. 



I. Protarthropoda — Peripatus. 

 II. Myriapoda — Centipedes, millipedes. 



III. Insecta — Insects. 



1. Aptera (Primitively wingless insects) — Machilis, Lepisma. 



2. Orthoptera — Cockroaches, Earwigs, Locusts, Grasshoppers, 



Praying Insects {Mantis), Stick- and Leaf-Insects (Phas- 

 midae). 



3. Hemiptera — Bugs, Green fly {Aphis). 



4. Neuroptera — Dragon-flies, May-flies, Termites. 



5. Coleoptera — Beetles. 



6. Hymenoptera — Bees, Wasps, Ants, Ichneumon-flies. 



7. Lepidoptera — Butterflies and Moths. 



8. Diptera — Flies. 



Aphaniptera — Fleas ; Anoplura — Lice ; Mallophaga — " Biting 

 Lice." 



B. Mainly terrestrial Arthropods possessing book-like breathing organs. 



IV. Arachnida — King-Crab {Limulus), Scorpions, Spiders, Mites, 



Ticks. 



C. Aquatic Arthropods breathing by gills. 



V. Crustacea — Lobsters, Prawns, Shrimps, Crabs, Sand-hoppers, 

 Slaters (Wood Lice). 



The phylum Arthropoda includes, as will be gathered from an inspec- 

 tion of the foregoing table, an immense variety of creatures — the known 

 species greatly exceeding in number those of all the other phyla put 

 together. The beauty and variety of their colouring and form, and the 



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