The wingspan of Adhemarius ypsilon is 89–117 mm for males and 107–126 mm for females.
According to Dr. David Lees from the Department of Zoology of the University of Cambridge, United Kingdom, who I met in Madagascar in January 2014, this may be Adhemarius ypsilon, but it should be noted that it is difficult to make a 100% identification from just a photo.

El Dorado Lodge area, Sierra Nevada de Santa Marta, Colombia, 26 October 2014