Laemostenus janthinus is a species in the beetle family Carabidae.
Laemostenus janthinus can reach a length of about 14-.[1] It is a nocturnal predator of other small arthropods.
This species can be found in Austria, Bosnia, Croatia, France, Italy, Poland, Slovenia and Switzerland.[2]
This species inhabits forests and Alpine prairies at an elevation of 2000–2400 meters above sea level.[1]