CHAPTER VI 

 ARTHROPOD A 



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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