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StumbleUponPosts Tagged: Eristalis tenax
The Imposter
"If it looks like a duck, quacks like a duck, and walks like a duck, it's probably a duck," or so the saying goes.
But if it looks like a honey bee, moves around on blossoms like a honey bee, and feeds on nectar and pollen like a honey bee, it may not be a honey bee.
It could be a flower fly or syrphid in the Syrphidae family.
The syrphids suffer from multiple cases of mistaken identity.
One of the syprhids commonly mistaken for a honey bee (Apis mellifera) is the drone fly (Eristalis tenax).
An imposter!
We spotted a drone fly--the first we've seen this year--on Feb. 5 in Tomales, Marin County. It was nectaring a pincushion flower (Seabiosa columbaria) at the Mostly Natives Nursery.
"There's a bee!" someone exclaimed.
It wasn't. It was a drone fly.
In its larval stage, it's known as a rat-tailed maggot. You'll see it in stagnant water, such as in ditches, ponds and drains. It feeds on stagnant rotting organic material.
In its adult stage, it moves from flower to flower, sipping nectar and pollinating flowers. Watch it hover and you know it's not a honey bee. Look at its two wings, and you know it's not a honey bee (the honey bee has four).
Lots of other differences, too.
It's a good pollinator, but a honey bee, it is not.
Drone Fly
Honey Bee
You're No Honey Bee!
Remember the 1998 U.S. vice presidential debate when Sen. Lloyd Bentsen told Sen Dan Quayle: "I knew Jack Kennedy, and you're no Jack Kennedy!"
Well, in the insect world, there's a fly that looks a lot like a honey bee, but it's no honey bee.
It's a drone fly (Eristallis tenax) from the family Syrphidae. It resembles a drone (male) honey bee.
UC Davis entomologist and emeritus professor Robbin Thorp of the Harry H. Laidlaw Jr. Honey Bee Research Facility, who does research on native pollinators, identified the drone fly below as a female.
The drone fly is brownish black with light yellow triangles at the base of the abdomen.
"It's sometimes called the 'H fly' for the pattern on the front of the abdomen," Thorp said.
So, what's the resemblance between a drone fly and a drone honey bees? The eyes. And the similar bullet-shaped bodies. "The eyes look quite a bit alike," agreed UC Davis apiculturist Eric Mussen.
However, the honey bee has four wings, and the drone fly, two. "But sometimes," Mussen said, "you don't notice the drone honey bee's other pair of wings."
There's no mistaking the larvae, though. They drone fly larvae are aquatic. They live in drainage ditches, sewage, and stagnant ponds or sluggish streams. Each little sausage-shaped larva has a long breathing tube which it extends to the surface for oxygen. It's known as a "rat-tailed maggot."
Did anybody say "Yecch?" Yecch!
Sometimes you'll see the rat-tailed maggots moving around in fresh cattle dung or, shall we say, moist excrement.
Did anybody say "Yecch?" Yecch!
When it's an adult, it visits flowers, like this drone fly did in the Storer Gardens during the recent UC Davis Arboretum Plant Faire.
Drone fly
Drone fly eyes
