A preliminary phylogeny and review of the genus , with descriptions of two new species (Coleoptera, Carabidae, Bembidarenini).

The genus Erwin, a genus of very small carabid beetle endemic to Australia, is reviewed. Although uncommon in collections, they can be abundant and diverse on banks of fine gravel or coarse sand next to bodies of fresh water; samples from southeastern Australia suggest numerous undescribed species. An initial phylogenetic hypothesis for the genus is presented, including 19 of the 32 known species. The inferred phylogeny, based upon one mitochondrial and four nuclear genes, shows the group to be sister to remaining , with the group and (Darlington) also being phylogenetically isolated. Two new species are described: , from the Australian Capital Territory, is a member of the group; , from Tasmania, is a member of the group. Identification tools for described and some undescribed species are presented, including photographs of all known species.