Field notes from Isla Colon:

This sphinx moth flies both day and night on Isla Colon, though I have only found it once at night. In that instance I saw one individual at a fluorescent porch bulb on an outside wall at the ITEC field station. There were mercury vapor lamps nearby but the moth chose the fluorescent.

During the day, Aellopos ceculus can be found patrolling low shrubs in pastures in bright sun. I have also found it once late in the afternoon right before sunset, nectaring at bushes in the pasture.