19a (18a). Beak arises from front part of head (Figs.A-E) [gnat bugs..Hemiptera /Heteroptera.......... 140

 

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A B C D E

 

 

19b. Beak arises from hind part of head (Fig.A) [cicadas, some hoppers, aphids, some

psyllids and whiteflies]......................................................................................................Homoptera

 

 

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A