DIPTERA (TWO-WINGED FLIES). 
79 
to occur chiefly among the Syrphidce (to a lesser degree also among 
the Asilidce. The Syrphidce as a family may be said to mimic 
Hymenoptera, but in some genera — e.g. Volucella, Arctophila, 
Ccdliprobola — -the resemblance is especially pronounced). Instances of 
mimicry between Diptera and insects belonging to any order other 
than Hymenoptera are exceedingly rare. Cases of mimicry betiveen 
particular species should be specially noted. 
