T. C.  Barr, «A new cave beetle of the genus Ptomaphagus (Catopidae) from DeKalb County, Tennessee», Journal of the Tennessee Academia of Sciences, vol 33, pagg 170-171., 1958.

T. C.  Barr, «The Blind Beetles of Mammoth Cave, Kentucky», The american midland Naturalist, vol 68, pagg 278-284., 1962.

T. C.  Barr, «Studies on the cavernicole Ptomaphagus of the United States (Coleoptera, Catopidae)», Psyche, vol 70, pagg 50-58, 1963.