Syrphidae? - Xylota flavitibia

Moved

Moved from Xylota.

… Ken Wolgemuth, 15 June, 2019 - 7:12pm

Xylota flavitibia .... male

… Bill Dean, 15 June, 2019 - 4:30pm

Moved

Moved from Chalcosyrphus libo.

… Ken Wolgemuth, 14 June, 2019 - 8:51am

Xylota .... male.

Xylota .... male.

Possibly Xylota flavitibia ..... male.
Femur narrows to tip, not to before tip as in Chalcosyrphus.
Humeral callus is not so noticeably white in Chalcosyrphus libo and Chalcosyrphus libo has a triangular black central mark at the middle anterior of tergite 2. Chalcosyrphus libo has brownish black thorax and not coal black like here and it doesn`t have white hairs on pleurae.
The apical veins of the 2nd basal cell and r-m vein are much more heavily infuscated in Chalcosyrphus libo than they are here. The completely white frons and white face don`t fit. The head behind the eyes is dusted white but not in libo. In the species above, the basal half of the hind femora is dull and grayish but more shining in Chalcosyrphus libo.
Then there is the disjunct distribution - Wyoming.

… Bill Dean, 13 June, 2019 - 5:50pm

Note dark arista.

Note dark arista. Pale in Chalcosyrphus libo.

… Bill Dean, 13 June, 2019 - 9:39pm

This may be the female.

This may be the female.
Note the line of white hairs below notopleuron area.

Arista dark.

… Bill Dean, 13 June, 2019 - 9:29pm

Moved

Moved from Xylotina.

Only two Nearctic Chalcosyrphus with the red abdomen as here; yellow hind tarsi separate this fly from C. piger.

… Kelsey J.R.P. Byers, 16 November, 2016 - 4:57am

C libo was also my first thou

C libo was also my first thought, but look at the map and the time, it is much later and much more SW than the rest... but I have no better idea what it could be...

… Martin Hauser, 16 November, 2016 - 10:01am

Hmm, interesting - Systema Di

Hmm, interesting - Systema Dipterorum says it gets down to South Dakota which is adjacent... piger does get much further south, though.

Jeff Skevington's page here does note that libo is in Ontario until late July and piger until late September, so this fly is intermediate there. Would you prefer we move it back to subgenus?

… Kelsey J.R.P. Byers, 16 November, 2016 - 12:53pm

I think we should leave it wh

I think we should leave it where it is right now... BG is not always complete with the distribution of course and it is not a complete impossible location for it... furthermore it is also the best ID I could come up with!

… Martin Hauser, 16 November, 2016 - 2:01pm

Moved

Moved from Syrphid Flies.

… Martin Hauser, 15 November, 2016 - 7:02pm

thank you

Thanks for the confirmation on the xylotina

… smcnpt, 15 November, 2016 - 10:21pm

Moved

Moved from ID Request.

… Ken Wolgemuth, 15 November, 2016 - 6:33pm