Head of a fly

Image 1. Plate 24 (Schem. XXIV), between pp 174-175 (Observation 39 Of the Eyes and Head of a Grey drone-Fly, and of several other creatures.) in Robert Hooke, Micrographia: or, Some physiological descriptions of minute bodies made by magnifying glasses. London: J. Martyn and J. Allestry, 1665. Dimensions (print): 305mm x 270mm. Source: National Library of Wales via Wikimedia (public domain). 

Image 2. Head of a bluebottle fly. Source: 'skeeze', pixabay (CC0).