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Dichomeris praevacua is a moth in the Gelechiidae family. It was described by Meyrick in 1922. It is found in China (Shanghai).
The wingspan is about 16 mm. The forewings are pale ochreous-yellow, the costa with a short dark fuscous streak on the base, then shortly strigulated dark fuscous to a spot of dark grey irroration at three-fourths. The dorsal edge is slightly speckled with grey and there are cloudy dark fuscous dots above and below the fold at one-fourth, the upper posterior. The stigmata is blackish, the plical rather obliquely before the first discal and there is some slight grey irroration from the costal spot at three-fourths to a similar spot on the dorsum opposite. There is also an irregular streak of dark grey suffusion along the termen, thickest near the apex, sometimes black-marked on the terminal edge. The hindwings are light grey, paler and thinly scaled towards the base.