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

 

           Please CLICK on pictures to enlarge

 

            

                          A                                B                       C                           D                       E

 

 

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

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

 

 

           Please CLICK on picture to enlarge

 

            

                                 A