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a Syrphid fly? - Eristalis transversa

a Syrphid fly? - Eristalis transversa
College of DuPage, DuPage County, Illinois, USA
July 11, 2013

Moved from Eristalis.

Eristalis transversa - bright yellow scutellum, gray and black fasciae on the thorax. Ron's right as usual!

Aw, shucks...
...he says, looking down at the ground and nudging a clod of dirt with his toe.

*grin* 's true, though!
*grin* 's true, though!

Moved from Syrphid Flies.

Why not E. transversa?
Note vibrant colors, relatively small size of head in relation to thorax, which has lateral stripes.

Sorry for the confusion! I t
Sorry for the confusion! I think you're right about E. transversa - I was just bulk-moving the Eristalis out of Syrphidae. Next plan is to go through and grab all of the E. tenax and E. transversa in Eristalis and put them to species. I appreciate the nudge!

Ah ha. I should have figured that out.
You're so far ahead of me that my arms aren't long enough to nudge.

Hah! Far from it. And I nee
Hah! Far from it. And I need a good nudge from time to time, so I rely on you to reach back and nudge me :^)

Though - I have an odd questi
Though - I have an odd question about this fly. I think I'm seeing some gray and black horizontal banding on the thorax, hidden under the pollen - almost like Palpada vinetorum. Any chance we're wrong about Eristalis???

(abdominal pattern looks like E. transversa, though, so I may be seeing things)

Now you sound like me a couple weeks back.
I think you and Martin cured me, though, and am pretty confident this is not Eristalis, even though the banded thorax continues to give me pause. (Hairiness comes into play here somewhere, but I'm not clear on it.)

Not quite sure I got what you
Not quite sure I got what you're saying there - do you think Eristalis or Palpada? (I can't tell if a "not" got accidentally inserted, but happy to go either way!)

Now I'm confusing myself and am totally uncertain.
(For the record, I did think it was E. transversa earlier.)

Please see Martin's comment here:

Gotcha. There's an impressiv
Gotcha. There's an impressive amount of variation within the abdominal patterns of E. transversa as well, and I hadn't realized it had thoracic patterns quite so close to Palpada.

Looking at the pictures, it looks like many of these guys have hair on the sides of their thorax - both Eristalis and Palpada. I might spend some time in the next few days looking at the difference to make sure I'm solid on it - happy to leave the fly in Eristalis for now?

Yeah, let it rest!
FWIW, I came to the conclusion that E. transversa had a proportionally smaller head than Palpada and that the thorax was also a bit thinner.

I think I remember someone saying one had a bigger gap between head and thorax, but don't recall which.

Eristalis transversa is the only species with the Palpada-like thorax stripes, I'm fairly certain.

I've done enough damage here for one day. Good night, Kelsey.

No damage at all! Far from i
No damage at all! Far from it; you've reassured me and made me less nervous about it (and curious!). Have a good night yourself! Those are good points about the head and thorax.

Why not E. transversa?

Moved from ID Request.

Transverse Flower Fly (Eristalis transversa)

Yup. You've got a lovely spu
Yup. You've got a lovely spurious vein on the right and left wings (the fourth vein down from the outside of the wing... see how it kind of trails off without going anywhere?), which is a nice character for them. Can't help you beyond that, sadly!

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