Figure 4 in ''Riding'' behaviour by males of Conops quadrifasciata (Diptera: Conopidae): Do females set up ''riders'' as targets for takeovers by larger males?

Figure 4. This attacking male (on left) has rammed a riding couple with such force that they were knocked off their flower on to a leaf. The female remained stationary for the several minutes needed for a successful replacement of her partner. Comparison of head-widths indicates that the attacker is considerably larger than the rider.