I saw several of these syrphids (I think) taking nectar in the Lower Rio Grande Valley, but this was one of the few that held still, on a cloudy, cool day. Size estimated. Thanks for help with identification--see comments. Note the prominent yellowish halteres
This photograph was taken during a field trip as part of the 2006 Texas Butterfly Festival
in Mission, Texas. This was the odonate trip led by Josh Rose
and Bob Behrstock
Image updated 1 January 2021.
Posted at iNaturalist:
edanko suggested an ID
Ultramarine Hover Fly - Ocyptamus dimidiatus