Shards, sequences, and shorelines: two new species of Bembidion from North America (Coleoptera: Carabidae)

Two new species of Bembidion are described from river shores in North America.  One, Bembidion mimbres sp. nov., from the Gila River watershed in the lands of the Mimbres culture in New Mexico and Arizona, is closely related to the widespread Bembidion levigatum. DNA sequences from several linkage groups provide evidence of the distinctiveness of B. mimbres. The second, Bembidion corgenoma sp. nov., has been the subject of recent genomic and transcriptomic studies.  It belongs in the Bembidion transversale subgroup, and occurs from California north to British Columbia, east to Montana and Nevada. The B. transversale subgroup as a whole is reviewed, and characters that distinguish B. corgenoma from the similar and sympatric B. transversale and B. erosum are described and illustrated.  DNA sequences of these three species show no consistent differences in 28S, COI, CAD, and Topoisomerase, and a coalescent species delimitation analysis reveals no notable structure within the complex. This ...