Mitzmain has described in detail the act of biting on man, as observed in the squirrel flea, Ceratophyllus acutus.
Thus, temperature greatly influences the duration of the pupal period, which in Ceratophyllus fasciatus averages seventeen days.
Dr Dampf introduced a number of common bird-fleas (Ceratophyllus gallin) of both sexes to some hairy caterpillars.
Nuttall readily transmitted the trypanosomes through the agency of fleas, (Ceratophyllus fasciatus and Ctenopthalmus agyrtes).
Among the commonest fowl-fleas which bite man are Ceratophyllus gallin and C. gallinul.
