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Oregon Syrphid #1 dorsal view - Megasyrphus laxus - female

Oregon Syrphid #1 dorsal view - Megasyrphus laxus - Female
Jubilee Lake trail, Umatilla County, Oregon, USA
June 27, 2006
This was a numerous species at the mountain lake we visited, though adults were never found right next to each other. This species is an aggressive flyer, with aerial movements much like those of a yellow jacket. On several occassions, adults followed us in the same manner as a yellow jacket searching for food would (neither my husband nor I were wearing bright colors). I have seen syrphids exhibit territorial behavior towards each other, but have never seen a species quite as aggressive in its flight around humans as this one!

Images of this individual: tag all
Oregon Syrphid #1 dorsal view - Megasyrphus laxus - female OR syrphid #1, ventral view - Megasyrphus laxus

Moved from Megasyrphus.

Moved from Syrphini.

Looks like Megasyrphus/Eriozo
Looks like Megasyrphus/Eriozona (synonyms) - the dipped R4+5 vein is key here. The dark frons and the yellow bands on tergites 3-4 reaching the edges of the abdomen distinguish this from Didea.

thanks much again, Kelsey
could you please direct me to the source of this synonymy, if not too much trouble?

Absolutely! I first ran into
Absolutely! I first ran into it here - a comment by Martin Hauser.

ah! ok, fine --thanks again
Martin didn't delete Megasyrphus from the list of genera he reviewed upon my request back in 2011 when i was putting together the synoptic classification of our fauna for the fam. page(1) --but, as you can imagine, i would readily drop the pseudo-missing taxon! just give me a legitimate excuse...

The list on that page is *so*
The list on that page is *so* helpful - thanks for putting it together!

When I ran my Olympic NP syrphid through the Key to the Genera of Nearctic Syrphidae, it gave Megasyrphus, so I was surprised when that genus was unpopulated here. Fortunately a site search turned up Martin's comment. Confusing, indeed!

Moved from Syrphid Flies.

I've been wondering about tha
I've been wondering about that! Thanks for the very helpful info.

You're welcome!
There's more on this topic in the Images section of Help if you need it.

I linked your images, since it's one specimen.
Another way to do this would be to use the "add image" function (under each image) after you post the first one - that way you don't have to fill out the submission form twice. :)

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