Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Sphaeroderus nitidicollis brevoorti Lec. - Sphaeroderus stenostomus

Sphaeroderus nitidicollis brevoorti Lec. - Sphaeroderus stenostomus
Lac-St-Charles, Quebec County, Quebec, Canada
May 27, 2006
Size: 13.5 mm
Caught with a pit trap.

Main caracteristics used to identify this species:
More than 13 grooves on the elytra,
Shiny bumps on the apical part of the elytra,
Base of pronotum highly punctate.

The other subspecies in Quebec, S. nitidicollis nitidicollis, is only found on Anticosti Island and is bigger than S. nitidicollis brevoorti, wich is found anywhere else in the province.


Sure it's not stenostomus lecontei?
Both nitidi*collis and stenostomus share those characteristics you listed, and from what I can see in the picture it looks a lot more like stenostomus.
Specifically, the convexivity between the basal impressions and lateral bead, and the elytral striae being more normal apically.

Moved to species level
Moved from Small Snail Eating Beetles.

Very interesting contributions--obviously you have expertise in this difficult family. Incidentally, for difficult-to-identify groups such as Carabids, it would really help the rest of us if you could summarize the basis of the identification--specific printed keys, consultation of an authority on the group, or comparison with museum specimens.
--Many thanks,

S. nitidicollis main caracteristics
See the picture's remarks.

Carabidae identification key
To identify my Carabids, I use this identification key:

André LAROCHELLE, Manuel d'identification des Carabidae du Québec, Curdulia, Supplément 1, 1976

I also compare my specimens with pictures from the Internet and from this book:

Yves DUBUC, Les Insectes du Québec, Éditions Broquet, 2005

Excellent, shortcuts
Excellent details--even more than needed, thanks. You are fairly new to the site, and you might not know you can add reference sources under the "books" tab. I just did that for Les Insectes du Québec, (1), which can be cited as:

I also made a citation for the journal article (2), which can be cited as:
So now, if you like, you can comment simply "keyed by LaRochelle, 1976 (2)"