Lyonetia probolactis is a moth in the family Lyonetiidae. It is known from Mahé and Silhouette islands in the Seychelles. This species has a wingspan of 9–10 mm – head, palpi, antennae and thorax are silvery with, crown smooth. Forewings are pale shiny silvery grey, an ochreous-brown fascia about  2⁄3, triangularly expanded towards costa where it unites with an ochreous-brown apical patch, within which is a small round black apical spot, preceded by two small white costal marks partly in cilia. Cilia are pale grey.