Metathrinca iridostoma is a moth in the Xyloryctidae family. It was described by Diakonoff in 1968. It is found in the Philippines (Luzon). The wingspan is 17-18 mm for males and 16-17 mm for females. The forewings are snow white, with a silky gloss and with the basal fourth of the costa with a narrow marginal fuscous line. The hindwings are glossy silvery white.