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Xylophanes belti
At moth light after dark
Forest surrounding Rancho Naturalista, Costa Rica
From Wikipedia: "The wingspan is 90–95 mm. The uppersides of the forewings, head, thorax and abdomen are deep olive green. There is a stripe running from the forewing base to the palp. The lateral patch on the abdomen and the undersides of the body and wings are deep carmine-red. The forewing upperside is deep olive green, although the interspaces have a silky blue-grey gloss. There are three antemedian lines, of which the second and third are merged. Adults are on wing year-round in Costa Rica."
Thank you for the ID, DCDruenn! After reading the Wikipedia information and looking up more photos online, not only do I agree with your suggestion - but I found that I had two additional photos of the species that I had not recognized as the same! I've updated my spotting with the correct ID - and added the two additional photos (I trust that is permitted?)