Metathrinca loranthivora is a moth in the Xyloryctidae family. It was described by Meyrick in 1937. It is found on Java. The wingspan is 15-18 mm. The forewings are grey-whitish, variably sprinkled or irrorated grey and with the plical and second discal stigmata moderate, black or blackish-grey. There is a moderate or rather narrow posteriorly suffused dark grey fascia at about two-thirds parallel to the termen. The hindwings are grey-whitish. The larvae have been recorded feeding in the shoots of Loranthus species.