Chilocorus tumidus is a species of lady beetles in the family Coccinellidae. It is native to North America, where it has been recorded from Virginia and Maryland.
Description Adults reach a length of about 4.20-5.75 mm. Adults are dark brown to black, with a transverse spot on the elytron.
References
"The Coccinellidae (Coleoptera) of America North of Mexico", Robert D. Gordon. 1985. Journal of the New York Entomological Society, Vol. 93, No. 1. Gordon, Robert D. (1985). "The Coccinellidae (Coleoptera) of America North of Mexico". Journal of the New York Entomological Society, vol. 93, no. 1, 1–912.
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. 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.