Isophrictis dietziella is a moth of the Gelechiidae family. It was described by Busck in 1903. It is found in North America, where it has been recorded from Colorado and California. The wingspan is about 16 mm. The forewings are fawn coloured, at the base concolorous with the thorax, but becoming deeper toward the tip. There is a small black streak on the fold at the middle of the wing and a small black dot at the end of the disk. A thin white line is found at the beginning of the costal cilia, running obliquely outward across the tip of the wing. Opposite it, from the dorsal edge, another thin white line is curved upward and outward, nearly but not quite meeting the costal streak at the dorsal edge near the tip. Both are continued out into and meet in the dorsal cilia, which is yellowish