91a (90a).    Ocelli present and/or venation reduced; eyes meet above
antennae; wing not scaly
                   (Figs.A-C) (larvae are
predators of Homoptera & mites).…....................( Diptera)  Cecidomyiidae
 
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                  A                                            B                                                 C
 
 
91b.    Ocelli absent; probosis extends far beyond clypeus; wing
venation strong; wing  veins and
             margin covered
with scales, usually also on body (Figs.A-G) (larvae of some species 
are predators
of aquatic
arthropods)......................................……........................( Diptera)  Culicidae
 
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                             A                                 
B                                   C                                       D
 
                                               E                                 F                                  G