Ausonius, Epigrams XVII:
“Old white-haired Myron asked Lais for a night, and received an immediate rejection. He knew the cause: so he darkened his white head with dark soot. So Myron, with the same face but different hair, repeated his earlier request. But Lais, comparing his form with his hair, and thinking him similar but not the same (though perhaps the same), wished to make a joke, so she said, ‘You fool, why are you asking for what I refused? I just said no to your father.'”
Canus rogabat Laidis noctem Myron:
tulit repulsam protinus
Causamque sensit: et caput fuligine
fucavit atra candidum.
Idemque vultu, crine non idem Myron,
Orabat oratum prius.
Sed illa, formam cum capillo comparans,
similemque, non ipsum rata,
fortasse et ipsum; sed volens ludo frui
sic est adorta callidum:
inepte, quid me, quod recusavi, rogas?
Patri negavi iam tuo.
No source?
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It should be listed at the top. I accidentally forgot it in the initial posting. Sorry!