Pachybrachis brevicollis is a species in the subfamily Cryptocephalinae ("case-bearing 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.). (21 June 2002). American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea. CRC Press LLC, Boca Raton, Florida . Arnett, Ross H. (2000). American Insects: A Handbook of the Insects of America North of Mexico. CRC Press. 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.