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ZOOLOGY 



Fleas 



Flies 



Order Siphonaptera 



The fleas ; small, wingless, jumping insects with com- 

 pressed bodies, somewhat related to the flies. The 



metamorphosis is complete 

 and the mouth is formed for 

 sucking. The antennae are 

 short and relatively incon- 

 spicuous. The bacillus of 

 bubonic plague is carried by 

 fleas, which accordingly be- 

 come of great economic im- 



From Bulletin 67, U. S. National Museum 



FIG. 97. A flea. portance in some countries. 



Order Diptera 



The true flies, having only two wings. The mouth 

 parts are adapted for lapping or sucking, and the meta- 

 morphosis is complete. In the presumably more primi- 

 tive Diptera (suborder Nematocera) the antennae are more 

 or less long, with many joints. This series includes the 

 mosquitoes, gall gnats, crane flies, and others less famil- 

 iar. The higher Diptera have the antennae short, or at 



From Bulletin 67, U. S. National Museum 

 FIG. 98. A robber fly (Eicherax) with 

 its larva and pupa. 



From Bulletin 67, U. S. National Museum 

 FIG. 99. A green-bottle fly (Lucilia), 

 showing the thoracic bristles. 



