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Chlaenius chaudoiri - Chlaenius cumatilis - male

Chlaenius chaudoiri - Chlaenius cumatilis - Male
Pena Blanca , Santa Cruz County, Arizona, USA
July 27, 2013
Size: 15 mm
I believe this specimen may be Chlaenius chaudoiri.

This specimen was keyed using the Bell monograph.

Key traits include elongate antennal segment #3, lateral margin of elytra forming a distinct angle with basal margin, abdomen pubescent, pronotal epipleura broad, and proepisterna and center of abdomen coarsely punctate.

Any confirmations or corrections of this identification would be appreciated!


Dear Jesse Ray, I am assembling an
Arizona Beetle Field Guide, mostly based on photos of 1700 species that I took since 2007. Art Evans is writing the text, so the quality should be good. You photo here could add another species. Would you allow me to use it? Right now we are planning to self publish, so I am paying for the printing and have no money to offer for images. If we have success in a planned crowd funding effort, that may change. Thank you already for your consideration
Margarethe Brummermann

Photo Use
Margarethe, I have no problem with you using this photograph, please feel free to do so. Thanks for asking.

Thank you so much!

Moved from Chlaenius sericeus.

I take it back.
Most puctures are seperated from Eachother Near midline At base by twice their own diameters. I had interperated that character incorrectly.


This is actually the lesser c
This is actually the lesser collected form of Chlaenius sericeus, which is usually green with a more widened base of pronotum. What sepperates it is in the Cursor group, the punctures on the pronotum are sepperated from the midline by over twice their own diameter. In this photograph they are nearly touching. In this specimen the punctures are less dense than in most other individuals of sericeus, so I can see how it could have been confused.

Moved tentatively

thinking C. cumatilis...
looking at the pronotal punctuation (but my memory may not be serving me right...)

not leucoscelis, no?

similar, but not C. leucoscelis
In C. leucoscelis, the lateral margin of the elytra curves into the basal margin without an angle (Bell's solitarius group). In this specimen, the margins form a distinct angle.

I tentatively keyed the specimen to the cursor group in Bell's key. Being unicolorous, and having a pubescent abdomen - and given the collection locale - it lands at either cursor or chaudoiri.

Further input or discussion is greatly appreciated!

Other traits?

The Bell key only mentions relative opacity of pronotum as a trait separating these species, not punctuation.

What led me away from C. cumatilis was the presence of abundant hairs on the abdomen of this specimen, and which I believe would be glabrous if C. cumatilis.

Granted I have no experience with either of these species so I have no point of reference other than the key. Are there any other traits I should be looking for?

not that I remember, sorry
...was just a suggestion based on memory gestalt :)

Well hopefully another resident expert can provide further insight, this is the last Chlaenius in my collection without a confirmed name!

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