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

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#1003353
Calathus gregarius? - Calathus gregarius - male

Calathus gregarius? - Calathus gregarius - Male
Ancram, Columbia County, New York, USA
September 29, 2014
Size: ca 11mm
Using Bousquet, I'm coming out at C. gregarius, rather than C. opaculus, based largely on the elytra being somewhat shiny (and not C. ingratus because of the pronotum). Bousquet lists C. gregarius as one of the common Northeast species and, indeed, we've recorded several which we have attributed to this species.

And yet looking at the Bugguide pictures, I see more C. opaculus logged, and those have varying degrees of apparent shininess. My questions are - Is C. opaculus indeed the common species elsewhere? And, for those of you who look at ground beetles regularly, are these elytra shiny enough to qualify as C. gregarius? They're not as shiny as the pronotum, but I wouldn't describe them as "dull" either. Any thoughts? Unfortunately, I don't have a C. opaculus reference specimen.

Moved tentatively

could be either
It is, of course, difficult to judge the "shininess" from a photograph due to variations in lighting and such. But, it does seem to be somewhat shiny on the elytra, which is consistent with gregarius.

this is a male, so shouldn't be hard to confirm ID...
...through dissection; opaculus looks like a better match to me --hope our experts chime in

Moved from Beetles.

Moved
Moved from ID Request.

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