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
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