From Bandyopadhyay et al 2021. 
Diagnosis: Wing expanse: Male: 32–34 mm, female: 34–36 mm. P. pectinata is typically identified by the pectinated antenna in males, whereas in female it is filiform. It closely resembles P. albovittata in outer morphology. The major differences are observed in the forewing of the two species having a distinct black spot conjoined with the basal patch in case of albovittata whereas it is disjunct from the basal area in pectinata; the submarginal sinuous line is distinctly defined in pectinata whereas it is completely absent in albovittata. Hindwing completely fuscous unlike albovittata where the basal and inner area are whitish.