Plateumaris neomexicana is a species in the subfamily Donaciinae ("aquatic leaf beetles"), in the suborder Polyphaga ("water, rove, scarab, long-horned, leaf and snout beetles"). It is found in North America.
References
Further reading Arnett, R.H. Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). (2002). American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea. CRC Press LLC, Boca Raton, FL.
Richard E. White. (1983). Peterson Field Guides: Beetles. Houghton Mifflin Company. Riley, Edward G., Shawn M. Clark, and Terry N. Seeno (2003). "Catalog of the leaf beetles of America north of Mexico (Coleoptera: Megalopodidae, Orsodacnidae and Chrysomelidae, excluding Bruchinae)". Coleopterists Society Special Publication no. 1, 290.