﻿CLASSES AND SUB-KINGDOMS. 



183 



ACEPHALA. 



Sub-Kingdom Arthropoda {Insects, Spiders, Centipedes, 



Crabs, etc.). 



Class Insecta (beetles, bugs, butterflies, etc.). — Animals 

 whose bodies are made up of segments grouped together in 

 three regions, the head, thorax, and abdomen ; having three 

 pairs of jointed legs, and one or two pairs of wings, and 

 breathing air through openings in the sides of the body. 

 The word insecta comes from a Latin word, inseco, I cut into, 

 referring to the distinct separation of the body into regions. 



