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Photo#246430
Paratachys - Tachys scitulus

Paratachys - Tachys scitulus
Medfor, (~25 miles east of Philadelphia, PA) Burlington County, New Jersey, USA
June 1, 2008
Size: ~2.7mm
Here's a small Carabid that to me appears to key(1) to Paratachys,
possibly of the same ilk as . Appears at least similar to LeConte's P. scitulus (Tachys) seen here from the MCZ. With the slightly improved imaging technique used on this one, the recurved sutural stria with large puncture can be seen (aligned approx with stria #3). Corrections / suggestions welcome :)

came to UV light

Images of this individual: tag all
Paratachys - Tachys scitulus Paratachys - Tachys scitulus

Moved
Moved from Paratachys.

Moved
Moved from Bembidiini.

 
Paratachys scitulus
in my opinion best accounts for image and given data. However, elytra do not show the expected iridescence - but hopefully this is just a photographic illusion. Recent trend has been to move Paratachys species back to Tachys by mostly European authors.

 
iridescence, or lack there of
well my photo skills have been known to unintentionally remove things like iridescence (and hair, striae, and just about anything else), but I re-looked at this guy under a scope (with different lighting) and only saw slightly more shine than is seen in this image. If it helps, this other species was viewed simultaniously and appeared to posess about same level of shine

 
My specimen of P. scitulus from Wisconsin
shows same dorsal color pattern, is very shiny, but it also shows distinct (but not overwhelming) reflections of the rainbow colors (= iridescence) along discs of the elytra when swiveled back and forth. If this specimen in my hand and under scope failed to demostrate at least some iridescence, I would begin to think of alternate branches in published taxonomic keys on Paratachys/Tachys species.

 
my mistake,
I should have been more precise. "Shine" of course does not equal "iridescence". And just to make sure, I just check again tonight, using yet another type of light source (3,200K halogen), and Yes, this P. scitulus 'shows distinct (but not overwhelming) reflections of the rainbow colors (= iridescence) along discs of the elytra when swiveled back and forth'. It's mainly along the first two intervals and aft of middle, but it's definitely there. Thanks for keeping me honest :)

 
Thanks,
I too noticed that the iridescence was limited to the medial intervals.