The Lettered Sphinx is one of the earliest-flying sphinx moths in eastern North America, appearing in early spring when grape foliage first emerges. Its forewing has distinctive dark brown lines and markings that inspired its common name. Adults are attracted to light and can be found nectaring at flowers on warm spring nights.
Best time to see a Lettered Sphinx
The best time to see a Lettered Sphinx is April–May, when about 69% of U.S. sightings happen, based on 4,292 research-grade iNaturalist observations.
Not certain it is a Lettered Sphinx? What bug is this? walks through what to check first and the lookalikes that catch people out.
Recent Lettered Sphinx sightings near you
Live, research-grade observations from iNaturalist. Allow location to center the map on you.
Spot a Lettered Sphinx? Identify it instantly.
Point Huck at any plant, bird, or animal for an instant ID, its rarity, and a live map of where it is being seen near you.
Get HuckGet an alert when a Lettered Sphinx is spotted
Pick a park, state, or city and we’ll email you when one turns up there. One check a day, only when there’s something new.
Free. Unsubscribe from any email. See our Privacy Policy.
Love insects & arthropods? Get Huck field notes
Spotting tips, new species, and the best of what people are finding in the wild - straight to your inbox.