Cosmosoma fenestrata

Upperside: Antennae nearly black and pectinated (comb like). Head and eyes black. Palpi small and long, and of a fine scarlet. Tongue spiral. Thorax blueish green, almost black. Abdomen dark brown. Anterior wings the same, the middle part being perfectly transparent like glass, wherein is a dark cloud which is joined to the anterior margin. Posterior wings small, transparent, with a dark brown narrow border running round their edges, which at the upper corners is broad where it becomes cloud like.

Underside: Breast dark brown. Legs and thighs scarlet, which colour extends along the middle of the abdomen, almost to the tail, where it becomes a little fainter, being crossed by the rings of the abdomen, which are black and very narrow. All the wings of the same colour as on the upperside.[2]