''Dichomeris ptychosema'' is a moth in the family Gelechiidae. It was described by Edward Meyrick in 1913. It is found in Assam, India.
The wingspan is . The forewings are whitish ochreous, strigulated with fuscous and dark fuscous irroration (sprinkles) and with a small dark fuscous spot on the base of the costa, a short mark in the middle, another beyond three-fourths, and several dots between these. There is also a small blackish-fuscous spot on the fold at one-fourth. The second discal stigma is moderate, dark fuscous, with the plical and first discal minute or obsolete, the plical beneath the first discal. The hindwings are
iridescent
Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear to gradually change color as the angle of view or the angle of illumination changes. Examples of iridescence include soap bubbles, feathers, butterfl ...