G. R.  Crotch, ?On Choleva angustata and its varieties?, The Entomologist, vol. 2, p. 322., 1865.

G. R.  Crotch, ?Revision of the `Catalogue of british Coleoptera'?, The Entomologist, vol. 3, pp. 119-127., 1866.

G. R.  Crotch and Sharp, D., ?Additions to the catalogue of british Coleoptera, with descriptions of new species?, TEsl, 3rd ser., vol. 5, pp. 435-451., 1867.

G. R.  Crotch and Cantab, M. A., ?Descriptions of new species of Coleoptera from the pacific coast of the United states?, TAes, vol. 5, pp. 73-80., 1874.