Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington

TaxonomyBrowseInfoImagesLinksBooksData
Photo#147301
I'm Stumped with this one! - Ferdinandea croesus - male

I'm Stumped with this one! - Ferdinandea croesus - Male
Sweeney Ridge, Golden Gate National Recreation Area, San Bruno, San Mateo County, California, USA
September 5, 2007
I tried to key this in Cole (1)...got to family Syrphidae, genus Merodon. But the guide page for Merodon states that the only nearctic species is M. equestris, and this fly didn't seem to fit very well with any M. equestris images on BugGuide (e.g. this fly has two short transverse bars near the mid-wings, a relatively hairless mesonotum, etc.).

This fly seemed to have a small territory staked out among some Lizardtail bushes (Eriophyllum stachaedifolium), so I'm guessing it was a male. It intermittently rested on leaves of Iris douglasiana too.

Images of this individual: tag all
I'm Stumped with this one! - Ferdinandea croesus - male I'm Stumped with this one! - Ferdinandea croesus - male I'm Stumped with this one! - Ferdinandea croesus - male

Moved
Moved from genus page for Ferdinandea to species page for F. croesus. For reasons, see this post...the same criteria from that post apply here.

Syrphid
It is, and indeed it is a male in the genus Ferdinandea!
In your area of the world there are 5 species of the genus, but I don't know which one it is! Probably something like a male Ferdinandea buccata, but tht's a guess!
Greetings,

 
Ferdinandea looks real good!
Thanks Gerard! That definitely fits well. And in hindsight, I can now follow the key in Cole(1) and see how it might lead to Ferdinandea :-)

Really nice find
It looks like the missing link between bee flies and syrphids.

 
Yes, a Protosyrphibombyliid :-)
The long sought missing link!

Indeed, I was searching through Bombyliidae for a while before I figured out they always have terminal styles on their antennae, rather than dorsal aristae. (At least I think!)

A male Syrphid Fly, yes...
But no Merodon (Bulb Fly). These latter have distinctly swollen hind femora and a typical loop (similar to that of Eristalini) in wing venation. I think tribe Cheilosiini (Rhingiini in BG), maybe genus Fernandinea, is a better match. But I'm no Diptera expert...

 
Thanks Richard
You're right...I originally mis-keyed this guy in Cole(1) by underestimating the degree of "wobble" in the curve of the "3rd vein" (r4+5) needed to get to Merodon.

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.