Teleiopsis diffinis is a moth of the family Gelechiidae. It is found in Europe, North Africa, the Near East, central Asia and Siberia (Transbaikalia).[1]
The wingspan is 13–18 mm. Terminal joint of palpi as long as second. Forewings are ochreous-brownish, violet- tinged, more or less densely irrorated with blackish and whitish; an angulated oblique fascia of three violet-black raised marks about 1/4; stigmata blackish, first discal slightly beyond plical, second forming a transverse mark or pair of dots; an indistinct pale angulated fascia at 3/4, preceded by dark costal and dorsal spots. Hindwings over 1, grey. The larva is brownish-green, reddish-marbled; head and plate of 2 yellow-brown.[2]
Adults are on wing from May to August. There are two generations per year.
The larvae feed on Rumex acetosella and Rumex crispus.