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Telphusa necromantis is a moth of the Gelechiidae family. It is found in South Korea, Japan and China.
The wingspan is 10–12 mm. The forewings are cream-white with a rather broad dark grey irregularly edged slightly oblique almost basal fascia, partially suffused blackish. There is a moderate oblique dark grey fascia from the costa before the middle, suffused blackish anteriorly and on the costa, with an irregular projection on the dorsum posteriorly, bearing a small blackish-grey projecting spot beneath the black second discal stigma. A quadrate dark grey blotch is found on the costa at two-thirds and there is an irregular blackish-grey blotch towards the apex, as well as a marginal series of cloudy blackish dots around the apical part of the costa and termen. The hindwings are whitish-grey. Adults are on wing from early June to mid-August in Korea.
The larvae feed on Quercus serrata. They tie together the leaves of their host plant. The species is thought to overwinter in the larval stage.