What causes the opaque green colour in Lepidoptera?
According to this paper, green pigments are found in lepidoptera. The study focused on Geometridae, and found that the primary pigment in emerald moths, such as Hemistola chrysoprasaria is also found as secondary pigment in Pseudoips prasinana. The authors dubbed the substance 'Geoverdin' and suggest it may be a derivative of chlorophyll consumed during the larval stage. I cannot find any further studies mentioning 'geoverdin' or its chemical identity.