The seasonal and geographical distribution and developmental biology of Eupsilia morrisoni (Grote) are described. This species overwinters as an adult and has one generation each year. Head-capsule measurements indicate 6 larval stages. This common noctuid ranges from Nova Scotia west to North Dakota, north to southern Quebec, and south to southern Ohio. Moths are active shortly after sundown when temperatures arc above 52°F in the autumn, winter, and spring. Although larvae are sometimes common on unsprayed deciduous fruit trees at bloom, they apparently do not cause economic injury.