Greta diaphanus, the Antillean clearwing, is a species of clearwing (ithomiine) butterflies, named by Dru Drury in 1773.
Upperside: antennae black, and very long. thorax and abdomen dark brown. Wings transparent, vitreous (glass like). Anterior ones with the posterior edges bending as it were inwards. A small narrow border of dark brown runs entirely round the edges of these wings; and on the anterior edges, about a third from the tips, runs a dark brown streak towards the middle of the wing, close to which is a small white spot joining to the anterior edge. Posterior wings having also a very narrow border running about two-thirds round them, and stopping at the abdominal edges; some long yellowish hairs are placed on the anterior edges near the body.
Underside: palpi, breast, sides, ash-coloured. The dark brown borders surrounding the wings appear on this side of an orange-brown colour; the rest as on the upperside. Margins of the wings entire.
Wingspan inches (57 mm).