Monday, June 11, 2012
These are large beetles measuring up to35 mm in length. Their body is black with brilliant bluish-purple margins. Their elytra (wings) are grooved. This beetle is incredibly fast moving and difficult to capture. They often hide under rock or log piles during the day and come out at night to search for food. It is common to find them at lights at night, presumably these are the opportunistic hunters.
The adults of this species overwinter in the ground and emerge when spring returns. At this time they will seek mates.
Because of the voracious appetite this genus has for insects and especially caterpillars, one species was imported; Calosoma sycophanta was brought into the United States in 1905 as a form of biological control against the Gypsy Moth.This species originated in Europe and seems to have a particular fondness for caterpillars.
The Narrow Searcher is a native species and can be found throughout much of the United States. I frequently find them in our implement sheds where they are probably seeking the many insects that seem to live inside the buildings. It is always exciting to find such a large, quick moving beetle.