1866 T. S. Cobbold 41 The pit-headed or broad tapeworm (Bothriocephalus latus)..is indigenous in Ireland.
1890 Pit-headed..is applied specifically (a) to tapeworms, as Bothriocephalus latus (T. S. Cobbold), and (b) to venomous serpents of the family Crotalidæ, known as pit-headed vipers.