Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
News
BugGuide has sustained a serious outage and will have to rebuild all of its cached data. It will be slower than normal for the next while. Thanks for your patience. -John

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

National Moth Week photos of insects and people. Here's how to add your images.

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

Photos of insects and people from the 2011 gathering in Iowa


TaxonomyBrowseInfoImagesLinksBooksData
Photo#10358
Wasp or Syrphid Fly - Physoconops brachyrhynchus - male

Wasp or Syrphid Fly - Physoconops brachyrhynchus - Male
Kellogg, Wabasha County, Minnesota, USA
July 27, 2001
A small wasp (?)or Syrphid Fly on Leadplant flower. Any ID's on it?

Moved
Moved from Physoconops obscuripennis.

Considering only the gestalt of this single profile view, there are a lot of initial candidates, e.g. Physoconops brachyrhynchus, P. obscuripennis, P. bulbirostris, and P. excisus. The red humeri might even suggest Physocephala marginata...though the clear profile view of the hind femur (which is clearly not basally swollen) eliminates that genus.

I've tried to figure this one out a number of times. I think I've finally got it.

Notice that the cheeks are clearly white...like the rest of the face. That eliminates both bulbirostris and excisus, as Camras (1955) indicates they have dark cheeks.

To decide between the remaining two candidates, P. brachyrhynchus and P. obscuripennis, I studied the descriptions of those species (and their synonyms) given by Williston and Van Duzee (see appropriate links on the Info pages) and the key in Camras (1955).

P. obscuripennis is described as having legs mostly black; humeri yellow to silvery white pollinose with the pleural stripe only vaguely defined above. The delineation between the hyaline and infuscated portions of the wing are diffuse (which the specific epithet presumably refers to). And the 3rd antennal segment is significantly shorter than the 2nd.

In P. brachyrhynchus, the legs are mostly red; the humeri are red; and the pleural stripe is quite well defined. The 1st basal cell is hyaline, and its forward edge provides a fairly sharp delineation between the infuscated and hyaline portions of the wing. Also, the 2nd and 3rd antennal segments are roughly equal in length.

In light of the above characters, I think this individual...with its mostly red legs; fairly clear pleural stripe; visibly hyaline 1st basal cell, sharply separating infuscated and hyaline portions of wing; and subequal 2nd and 3rd antennal segments...falls under P. brachyrhynchus.

Note: this is a male, since it lacks a theca (= large "bump" below 5th sternite).

Moved
Moved from Physoconops.

Physoconops
THis is likely to be a species of Physoconops.
This genus is divided in three subgenera: Physoconops (5 species, widespread), Gyroconops (1 species, sylvosus) and Pachyconops (6 species, widespread).
I can't tell you which one of these it could be!
Greetings,
Gerard Pennards

Neither:-)
This is a thick-headed fly, family Conopidae. Not sure which genus.

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