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

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

National Moth Week 2020 photos of insects and people.

Photos of 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

Trupanea cf nigricornis - Trupanea bisetosa - female

Trupanea cf nigricornis - Trupanea bisetosa - Female
Agoura Hills, Los Angeles County, California, USA
April 3, 2015
I believe this to be nigricornis based on the key linked on the genus page, but if someone could check I would appreciate it.

It was swept from an area with purple sage, fiddleneck (Amsinckia intermedia), and California buckwheat. Also some coyote bush but I don't think it came from that.

Moved from Trupanea.

If you're referring to Foote, I don't see it there.
I've shot a lot of fruit flies - this BTW is a female - but don't recall any with this wing pattern. (Small wonder!) What strikes me as unusual is what I'm calling a "four pane" configuration. Follow the outside edge of the wing from the body to where the large black area starts. The first mostly clear section contains the four panes.

I realize this probably isn't much help, but maybe someone else will check in. I believe there's a more comprehensive version of Foote - using line art instead of photos. At any rate, that source is dated.

What about your pictures of that species at

Looks pretty similar to me. At least Trupanea have the decency to have notable differences that don't require a microscope...

James, I don't know how much variation there is in these flies.
As I mentioned earlier, the "four pane" wing on yours is unusual. (I did look at the OC site before commented before.)Hopefully, an expert will comment.

Fair enough
It does indeed seem there is an extra complete "square" marking. I notice your pictures show a really small spot in the place of the fourth square on mine, whereas some other bugguide images only show three squares and no trace of a fourth spot at all. Yes it will be interesting to hear the verdict on this one. It does look like it might be variation.

Interestingly only a portion of bugguide pictures show the black antennae the species was apparently named for.

Yours is a good, sharp photo with fine detail on the wings.
The only other thing that might aid in ID is knowing what plant you found it on. Note that I couldn't determine species from that, but possibly others could.

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