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

Information, insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 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


TaxonomyBrowseInfoImagesLinksBooksData
Photo#9130
Robberfly species? - Promachus vertebratus

Robberfly species? - Promachus vertebratus
West Chicago Prairie, Cook County, Illinois, USA
August 31, 2004
Not sure what species...anyone have an idea?

Moved
Moved from Giant Robber Flies.

Robber Fly
I'd venture to say Promachus vertebratus; I've photographed the same fly numerous times at Winfield Mounds Forest Preserve, just a few miles east of the West Chicago Prairie. Huge green eyes, lumbering, buzzing flight - a magnificent beast! Please see my photos at http://cirrusimage.com/Flies_robber_Promachus_vertebratus.htm

 
Promachus
Likely vertebratus and rufipes occur in that area and both have the yellow and black abdominal banding. They are large predators. I have a shot of our species P hinei, that is similar, after it took an adult Halloween Pennant. These and Triorla are the only robbers I have seen take adult dragonflies.

Need more clues:-)
If it was pretty large (inch or more), it is probably a species of Promachus. It is a female, we can tell by the tapered abdomen. Male robber flies have enormous claspers at the end of the abdomen.

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