Description: English: John Curtis British Entomology (1824-1840) Folio 142 Diptera: Melophagus ovinus (Sheep-louse, Sheep-tick or Ked).The plant is Hydrocotyle vulgaris (Marsh Pennywort). Date: 1836. Source: https://www.biodiversitylibrary.org. Author: John Curtis. Other versions: Derivative works of this file: Britishentomologyvolume8Plate142 cutted.png.