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

Upcoming Events

Discussion, insects and people from the 2018 BugGuide Gathering in Virginia, July 27-29

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

Robber Fly - Efferia tricella

Robber Fly - Efferia tricella
Tucson, Pima County, Arizona, USA
June 25, 2006
Size: approx. 1 in
From guide, I'm guessing subfamily Asilinae, maybe a Pogoniefferia. Although with splitting etc. it's hard to decifer. Can anyone point me in the right direction?

Images of this individual: tag all
Robber Fly - Efferia tricella Robber Fly - Efferia tricella

Moved from Efferia tricella.

Hello Herschel -
I'm a little mystified: Says, "Moved from Efferia tricella," but there is no explanation. Is it not Efferia tricella?? Also, it is still on that species' page. So, if it was moved, why hasn't it moved and if it's not E. tricella, what is it??????????????

New species
Made a new page and moved it to guide.

Happy to add a new species to the site - an excellent and enjoyable site by the way. Hope to add more in the future.

Really beautiful Efferia species. May be in the Pogon group but I doubt it. Will require a shot of the wing to get close. Remember this is one of the largest robber genera in the SW. Dr. Fisher may be able to get close.

Thank you for the information. How do I contact Dr. Fisher? Or will Dr. view this on BugGuide?

He has been checking here more often for robbers from the west.

robber fly - Efferia
Bob, Herschel: This is a splendid shot of Efferia tricella. The complete stump vein (connecting veins R2+3 & R4) can just be seen in the photo - placing this sp. in the anomala group of Efferia (= Efferia s. str.); the elongate knob at the tip of the male genitalia is characteristic of tricella.

Eric Fisher

I'm both surprised and elated that someone could ID "my" Robber Fly to species. Thank you Dr. Fisher.

Your shot was a very clean shot and I am able to see the recurrent wing mark now that he has mentioned it is visible. I would have never been able to get it to species though without more western Efferia experience. However, your species is one of the few in the group with white hairs on almost the entire abdomen. And it is a big species -- over an inch long, which limits the possibilities now that I look at the key.

Again, great shot.

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