Toxicological Trivia from November 20, 2015: In a recent article we talk about the "Batesian mimicry of a sirphid in Patagonia" (See in Spanish), a fly that imitates a bumblebee’. Hoverflies, sometimes called flower flies, sweat bees or syrphid flies, make up the insect family Syrphidae. As their common name suggests, they are often seen hovering or nectaring at flowers; the adults of many species feed mainly on nectar and pollen, while the larvae (maggots) eat a wide range of foods. In some species, the larvae are saprotrophs, eating decaying plant and animal matter in the soil or in ponds and streams. In other species, the larvae are insectivores and prey on aphids, thrips, and other plant-sucking insects.With a few exceptions, hoverflies are distinguished from other flies by:a) A spurious vein, located parallel to the fourth longitudinal wing vein;b) The eyes, larger than those of wasps and bees, especially in males;c) Both previous assertions are correct.

Correct answer: c. Read more on WP
See the eyes, larger than those of wasps and bees, especially in males