Notes on the taxonomy of the Mecodema spiniferum species group (Coleoptera: Carabidae)

Abstract

The taxonomy of some species of the Mecodema spiniferum group is discussed with regard to variations in the shape of the apex of the mid lobe of the male aedeagus. The type locality of Mecodema fulgidum Broun as published by Britton (1949) is corrected. Mecodema constrictum Broun is reinstated from synonymy. The validity of Mecodema gourlayi is queried. The description of Mecodema oconnori Broun is expanded to include some southern North Island specimens that Britton had identified as Mecodema spinifer Broun, and also a population from the Kaikoura coast of the South Island. The chief diagnostic character which Broun used to define M. spiniferum is present on only a few specimens from the type locality. In some species extra setae are shown to occur rarely on the elytra of a few individuals within the species.