W. P.  Mackay, ?Ptomaphagus californicus (Leconte) (Coleoptera: Leiodidae), an inquiline in the nests of the ant Formica haemorrhoidalis Emery?, CObu, vol. 34, pp. 79-83., 1980.

W. P.  Mackay, ?New host record for Ptomaphagus californicus (Leconte) (Coleoptera: Leiodidae)?, CObu, vol. 36, pp. 379-380., 1982.