Lasiarchis pycnodes is a moth in the Gelechiidae family. It was described by Meyrick in 1909. It is found in South Africa (Gauteng). The wingspan is 21–22 mm. The forewings are fuscous with an indistinct blackish dot beneath the costa near the base. The stigmata are blackish, partially edged with light greyish-ochreous, the plical larger, obliquely before the first discal. The costa is somewhat suffused with pale greyish-ochreous towards the middle and there is a suffused pale greyish-ochreous spot on the costa about three-fourths, with faint traces of a curved transverse line rising from it. The hindwings are grey, becoming paler and tinged with whitish-ochreous towards the base.