H. G.  Hubbard and Schwarz, E. A., ?The Coleoptera of Michigan?, Proceedings of the american philosophical Society, vol. 17, pp. 593-669., 1878.

E. A.  Schwarz, ?Myrmecophilous Coleoptera found in temperate North America?, PSew, vol. 1, pp. 237-247., 1894.

E. A.  Schwarz, ?A new cave-inhabiting Silphid?, PSew, vol. 4, pp. 57-60., 1898.