Syllepte segnalis is a moth in the family Crambidae. It was described by John Henry Leech in 1889. It is endemic to Japan.
The wingspan is . The forewings are brownish black, with a pale yellow discal spot and a wavy central band on the wing. The under surface are as above, but the markings are not so distinct.New species of Deltoids and Pyrales from Corea, North China, and Japan
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