''Laemostenus janthinus'' is a species in the beetle family Carabidae.

Subspecies

* ''Laemostenus janthinus coeruleus'' (Dejean, 1828) * ''Laemostenus janthinus janthinus'' (Duftschmid, 1812)

Description

''Laemostenus janthinus'' can reach a length of about .GIANNI ALLEGRO, LUIGI BISI
La carabidofauna della Riserva naturale del Mont Mars (Fontainemore, Aosta) (Coleoptera Carabidae)
/ref> It is a nocturnal predator of other small arthropods.

This species can be found in Austria, Bosnia, Croatia, France, Italy, Poland, Slovenia and Switzerland.Fauna europaea
/ref>

This species inhabits forests and Alpine prairies at an elevation of 2000–2400 meters above sea level.