Mecodema crenaticolle

Mecodema crenaticolle is a medium-bodied ground beetle that is endemic to New Zealand. It is one of the three species within the "ducale" species group and is the only species of this group found in the North Island, New Zealand. Its range extends from the Wellington Region to Hunua Range, southeast Auckland, and is relatively common in most native forest habitats.
Diagnosis.
Distinguishable from other North Island "Mecodema" species by having: 
Description.
Length 21–27.9 mm, pronotal width 5.8–7.3 mm, elytral width 6.7–8.6 mm. Colour of entire body reddish-brown to black.
Natural History.
Flightless and nocturnal predator of ground invertebrates including spiders, other carabids and worms.