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Photo#915143
Bumble Bee-Mimic Syrphid? - Criorhina nigriventris - male

Bumble Bee-Mimic Syrphid? - Criorhina nigriventris - Male
Fairfield, Somerset County, Maine, USA
April 29, 2014
Size: +/-15-18mm
I searched awhile and keep coming back to either Merodon equestris or Mallota but I see differences
around eyes, face, antennae...so I submit this one to the experts.

I found it crawling up a wooden ladder in a grassy area next to the woods-line. Not within 100 feet of any garden beds.
It seemed to have recently emerged as it was not sluggish, but could not fly and did not open it's wings a single time.

Images of this individual: tag all
Bumble Bee-Mimic Syrphid? - Criorhina nigriventris - male Bumble Bee-Mimic Syrphid? - Criorhina nigriventris - male Bumble Bee-Mimic Syrphid? - Criorhina nigriventris - male Bumble Bee-Mimic Syrphid? - Criorhina nigriventris - male Bumble Bee-Mimic Syrphid? - Criorhina nigriventris - male Bumble Bee-Mimic Syrphid? - Criorhina nigriventris - male Bumble Bee-Mimic Syrphid? - Criorhina nigriventris - male Bumble Bee-Mimic Syrphid? - Criorhina nigriventris - male Bumble Bee-Mimic Syrphid? - Criorhina nigriventris - male

Moved
Moved from Criorhina.

Trying to figure out whether
Trying to figure out whether this is Criorhina aurea or C. latipilosa. The question is whether the fourth abdominal segment is shorter than usual - which would be aurea. If it is of normal length, then it's latipilosa. (Curran 1925)

Opinions?

 
For future reference
Check out a species on Systema dipterorum. If you had checked these you would have seen both are restricted to the west coast.

 
Actually quite fond of SD, th
Actually quite fond of SD, though thanks for the thought. I ruled out C. nigriventris based on Curran's key ("Thorax wholly yellow pilose, or with a narrow, incomplete black pilose band between the roots of the wings") - this fly certainly doesn't fit that description. Unfortunately I can't get the original species description by Walton. Do you have specimens of nigriventris that have such a broad band?

 
Criorhina intermedia
Yes. Try Criorhina intermedia which is a synonym of C. nigriventris. Bumble bee mimetic flies are horrendously variable in setal coloration.

It is possible that several described species are actually just color morphs of one species. I know three extreme cases off the top of my head. C. aurea has a mostly black morph (Which you can see on bugguide) and a mostly yellow morph on which the species was described . C. coquilletti was described from a black morph but it also has a yellow morph. (You can see both on bugguide) One of the undescribed neotropical species has a entirely black morph and a black and yellow morph.

 
Thanks! And yes, someday we'
Thanks! And yes, someday we'll have genetics to deal with the taxonomic issues (to some extent). At least we don't have to deal with polyploidy...

 
I have a lot
of pics of this individual, so if there are any that may help, I will upload them...
Thanks again

 
I'd gladly supply an opinion...
...if only (1) I knew what the "usual" length should be and (2) I could even begin to make out the fourth abdominal segment. But since I don't and I can't, I'm afraid you're on your own. :)

 
Yup, that was my problem too!
Yup, that was my problem too! If the original poster has images showing the rear of the abdomen, those might help, and I guess we could compare to other Criorhina... but I'm at a bit of a loss as well :^)

Moved
Moved from Syrphid Flies.

Moved
Moved from Flies.

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