According to the criteria provided for Chlorocoma spp. by MoV (Part 4), the lack of a clearly visible yellow dorsal line (thorax and abdomen) and the more prominent (four) discal spots suggested to me this might be C. externa. Both C. dichloriaria and C. externa were said to have a red face, white antennae and thin red collar on the head which is visible on this, presumably female (antennae not visibly branched) specimen. However the outer fringe to the wings is yellowish and not dark red or spotted and the outer margin of the hindwing appears slightly angled - both features which MoV says are consistent with C. dichloraria.
Good points. I think the fringes are pink, and appear pale because they are silhouetted against the dark background, and with the plain green abdomen, I now think it is C. externa. Anyway, BOLD suggests that 32 of the 52 species of Chlorocoma that they illustrate are unnamed, see http://v4.boldsystems.org/index.php/TaxBrowser_Taxonpage?taxid=5657 so there is more than an even chance that this is one of those.