Tesagrotis atrifrons is very similar but has a well-defined black transverse line at the base of the thoracic collar that is lacking in piscipellis. (1)
Tesagrotis amia has a unicolorous brown or reddish-brown head and thorax; it also lacks the well-defined black transverse line at base of thoracic collar that is characteristic of atrifrons. (1)
Tesagrotis corrodera has pale shading of the forewing costal area; has a unicolorous brown or reddish-brown head and thorax; lacks the well-defined black transverse line at base of thoracic collar that is characteristic of atrifrons. (1)