''Hadrobregmus quadrulus'' is a species in the family Ptinidae ("death-watch and spider beetles"), in the order Coleoptera ("beetles"). ''Hadrobregmus quadrulus'' is found in North America.

References

* American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea, Arnett, R.H. Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL. * * LeConte, J. L. (1859). Catalogue of the Coleoptera of Fort Tejon, California. ''Proceedings of the Academy of Natural Sciences of Philadelphia, vol. 11'', 69–90. * Peterson Field Guides: Beetles, Richard E. White. 1983. Houghton Mifflin Company. * White, Richard E. (1982). A catalog of the Coleoptera of America north of Mexico. Family: Anobiidae. ''US Department of Agriculture, Agriculture Handbook'', 529–570. Anobiinae Beetles described in 1859 {{beetle-stub

References

Further reading