161. Common Drone Fly

This syrphid or hoverfly was introduced to North America prior to 1874 based on specimens. It has spread from Alaska to Florida and is common throughout the range. They are active pollinators, working over a wide range of plants. They are mimics of the European honey bee. 

The aquatic larvae are called rat-tailed maggots. -  The "tail" works like a siphon and will extend out of the fetid water that it is living in to breathe. They need to feed so there must be some food present. The eggs are laid in contaminated water, sewage or decomposing matter. 

The scientific name is Eristalis tenax.