33a (32a).    Body flattened laterally; usually jumping insects, with rather
long legs (Fig.A)
                  
[fleas].................................................................................................................................Siphonaptera
 
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                               A
 
 
33b.    Body flattened dorsoventrally; not jumping insects, legs
usually short (Fig.A) [louse 
flies, bat
flies & bee lice]..............................................................................................…............Diptera 
 
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                               A