Holotype: ♂, PERU, Dept. Ancash, 35 km SE Huaraz, Cerro Cahuish, Quabrada Pucavado, 9°40'50"S, 77°13'32"W, elevation ca. 4100 m, 15–18.ii.1987, O. Karsholt, genitalia slide no. RA566♂ (ZMUC).
type genitalia preparation:
Zoological Museum, Natural History Museum of Denmark, Copenhagen (ZMUC)
The species name is derived from Latin robustus (stout, strong) in reference to the heavily hardened (sclerotized) uncus, large angular inner lobe of valva and large, strongly sclerotized vinculum in the male genitalia.