Phtheochroa percnoptila Meyrick, 1933. Exotic Microlepidoptera 4 (14): 446.
Eugnosta percnoptila: Brown 2005. World Catalogue of Insects 5: 339.
Holotype male. Label data (7): "Type, P. percnoptila "; "Musée du Congo, N. E. Kivu: La Mutura, iii.1928, Ch. Seydel "; " Phtheochroa, percnoptila Meyr., n. sp. typ."; " R. Dét., H, 2238"; "M1497"; " Holotype, Phtheochroa percnoptila, Meyrick (male), Genital prep., 98085 L. Aarvik "; " MRAC / KMMA 00325 "; specimen ID: RMCA ENT 000004927 (Fig. 6).
Male genitalia (Fig. 54). Uncus minute; socius well sclerotized, slender, tapered terminally; vinculum complete; valva distinctly tapered terminally with belt-shaped sclerite extending from base of fold to end of costa; sacculus simple, broad at base; median part of juxta helmet-shaped, with some posterior thorns; aedeagus stout with short ventral termination; coecum penis broad, rounded; cornutus large with basal plate.
Female genitalia (Fig. 118). Sterigma a rectangular plate; ostium membranous, ductus bursae broad, membranous; corpus bursae strongly wrinkled in distal half, with large semicircular sclerite.
Remarks. Described from the male holotype only. The female genitalia are illustrated from a specimen not belonging to the type series with the following labels: “ KENYA: Rift Valley Prov., Turi, 8000 ft., 14.xii.1998, D. Agassiz leg. & coll.”; “Genital prep. LAA 22010”, in the collection of DA.