Synonymy

• Eumolpus villosus F. V. Melsheimer, 1806: 23 (nomen nudum)
• Myochrous plagiatus F. E. Melsheimer, 1835: 125 (nomen nudum)
• Eumolpus villosulus F. E. Melsheimer, 1847: 169 [original combination]
• Eumolpus plagiatus F. E. Melsheimer, 1847: 169 [as Eumolpus villosulus, var. ? a].
• Myochrous villosulus (F. E. Melsheimer, 1847): F. E. Melsheimer, 1853: 125
• Xanthonia villosula (F. E. Melsheimer, 1847): Crotch, 1873: 96

Primary references

• Crotch, G.R. 1873. Check list of the Coleoptera of America, north of Mexico. Salem, Massachusetts: Naturalists' Agency. 136 pp. DOI: 10.5962/bhl.title.11476 BHL
• Melsheimer, F.E. 1847. Descriptions of new species of Coleoptera of the United States. Proceedings of the Academy of Natural Sciences of Philadelphia 3: 158–181. BHL JSTOR
• Melsheimer, F.E. 1853. Catalogue of the described Coleoptera of the United States. Washington, D.C.: Smithsonian Institution. xvi + 174 pp. DOI: 10.5962/bhl.title.1562 BHL
• Melsheimer, F.V. 1806. A Catalogue of the Insects of Pennsylvania, part 1. Hanover: W. D. Lepper. vi + 60 pp. DOI: 10.5962/bhl.title.63142 BHL

Additional references

• Riley, E.G., Weisman, D.M. & Quinn, M.A. 2019. A taxonomic review of the Xanthonia species occurring in Texas (Coleoptera: Chrysomelidae, Eumolpinae). Zootaxa 4668(1): 1–29. DOI: 10.11646/zootaxa.4668.1.1 Reference page. 

• Staines, C.L. & Weisman, D.M. 2001. The species of Xanthonia Baly 1863 (Coleoptera: Chrysomelidae: Eumolpinae) in North America east of the Mississippi River. Proceedings of the Entomological Society of Washington 103(1): 157–183. BHL Reference page.