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Notiophilus semistriatus - Notiophilus biguttatus

Notiophilus semistriatus - Notiophilus biguttatus
Richmond Hill, York Region, Ontario, Canada
May 6, 2007
Size: 5 mm
My sister found this beneath a log. Both the CNC Checklist (PDF file) and CBIF reports four Notiophilus species for Ontario.
This individual is definitely N. semistriatus, based on color and the frequency and arrangement of puncturation on the pronotum and elytra. The rows of puncturation in the elytra of both aeneus and borealis are sparser and less parallel, while in the much darker aquaticus, the rows become less defined as they reach the elytral apex.

Images of this individual: tag all
Notiophilus semistriatus - Notiophilus biguttatus Notiophilus semistriatus - Notiophilus biguttatus


I am not sure this is N. semistriatus, but am leaning towards N. novemstriatus or N. biguttatus. Compare your images to those here.

The second interval on yours seems to much wider than that pictured on the GBC website, more in line with novemstriatus/biguttatus. I do realize that they do not list these species from Ontario, but novemstriatus is known from Nova Scotia and Michigan, and biguttatus is known from NB, NF, and NS (and Europe).

If not
If not semistriatus, then I might lean towards N. biguttatus. Compared to novemstriatus, it has denser rows of finer punctuation. The shape of the margin of the second interval is less straight than in novemstriatus. Overall color goes well with biguttatus also.
biguttatus is a non-native species, and probably expanded its NA range into Ontario. The Coleoptera Checklist is an outdated source, which led to my discounting other Notiophilus species. I was not careful enough on this ID at the time.

vote for biguttatus
and, Stephen: could you please flip your pix so that the specimen faces 'north'? standard orientation makes image recognition a lot easier

regarding N.aquaticus
I may add that the species is different from this one in two more aspects:
1. the smooth band along the suture is less wide
2. the elytra are not pale at the end.

I add a POSSIBLE example of aquaticus:

Maybe you can confirm its identity by exclusion?

Examination of the individual revealed that its elytra are pale-ended and the band along the suture is wide. Thanks for the additional info :-)

Moved from Notiophilus.

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