Xylorycta flavicosta is a species of moth in the family Xyloryctidae. It was first described by Thomas Pennington Lucas in 1894. It is found in Australia, where it has been recorded from Queensland.
Description The wingspan is 28–38 mm. The forewings are rich slaty grey, becoming ashy grey toward the basal portion of the costa. There is an orange-red costal band, more brown red in females and with a rich black velvety patch in the apical angle. The hindwings are fuscous grey.
Behaviour and ecology The larvae feed on Eucalyptus eugenioides and Eucalyptus gummifera.McMillan, Ian (30 June 2010). "Xylorycta flavicosta (T.P. Lucas, 1894)". Xyloryctine Moths of Australia. Retrieved 14 July 2020.
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