Dichomeris barnesiella is a moth in the family Gelechiidae. It was described by August Busck in 1907. It is found in Mexico and Arizona."Dichomeris Hübner, 1818" at Markku Savela's Lepidoptera and Some Other Life Forms. Retrieved July 7, 2017.
The wingspan is about 17 mm. The costal half of the forewings is light creamy yellow in contrast to the dorsal half, which is purplish brown. These two colours are sharply divided in the middle of the wing. The yellow costal part, which reaches nearly but not quite to the apex, has two slight serrations projecting into the dark dorsal part. The hindwings are dark fuscous.Busck, A., 1907. New American Tineina. Proceedings of the Entomological Society of Washington 8(3-4): 92 Adults are on the wing in May and September.Bug Guide
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