Usher, M.B., 1968. Megabothris turbidus (Rothschild), a flea new to Scotland. Entomologist?s Gazette 19(1): 43-44., p.533.

Usher, M.B., 1968. A new species of bird flea from the Manx Shearwater in Scotland. Entomologist?s Gazette 19(3): 173-180., p.534.

Usher, M.B., 1968. Notes on Ctenophthalmus nobilis (Rothschild) (Siphonaptera: Hystrichopsyllidae) and other mole fleas in Scotland. Entomologist?s Gazette 19(4): 223-228., p.535.