Perisama tryphena pallida Attal & Crosson du Cormier, 1996

= Perisama tryphena pastaza Attal & Crosson du Cormier, 1996, syn. nov.

Perisama tryphena is one of the most common species of Perisama with a wide geographic range and similar extent of individual variation as in P. bomplandii . Two subspecies were described so far from central and southern Ecuador, respectively: P. t. pastaza Attal & Crosson du Cormier, 1996 and P. t. pallida Attal & Crosson du Cormier, 1996. The distinctive characters of the former are: more compact and rounded FWD inverted pipe mark and thinner HWD ashen band, and in case of the latter, regular outlines of the discal part of the FWD inverted pipe mark, even thinner HWD ashen band and paler underside ground colour. Based on the given characters it is often impossible to define a particular morphotype of a single specimen. Recent data from Sangay National Park show that the extent of individual variation within particular, local populations often exceeds the alleged differences between the aforementioned subspecies (Fig. 12). Therefore, P. t. pallida is now considered a synonym of P. t. pastaza.