CLASSES AND SUB-KINGDOMS. 



183 



ACEPHALA. 



SUB-KINGDOM AETHEOPODA (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. 



