D. K.  Kevan, ?The aedeagi of the british species of the genera Ptomaphagus Ill., Nemadus Th., Nargus Th., Bathyscia Sch. (Col. Cholevidae)?, EMmg, vol. 81, pp. 121-125., 1945.

D. K.  Kevan, ?The spermathecae of the British species of Ptomaphagus Illiger and Parabathyscia wollastoni (Jansen) (Col. Catopidae)?, EMmg, vol. 99, p. 216., 1963.