Argyresthia semitestacella is a moth of the family Yponomeutidae. It is found in Europe.
The wingspan is 11–14 mm. The head is yellowish white. Forewings are light ferruginous-brown, faintly purplish tinged; a thick whitish dorsal streak to tornus, interrupted by a dark ferruginous-brown triangular median spot. Hindwings are grey.Meyrick, E., 1895 A Handbook of British Lepidoptera MacMillan, London pdf Keys and descriptionHeath, J. ed. 1996 The Moths and Butterflies of Great Britain and IrelandVolume 3 (Yponomeutidae to Elachistidae)
In the United Kingdom, the moth flies from August to September. The larvae feed on beech.
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