Maps of the chaetotaxy and scanning electron micrographs supplement a text description of the larva and pupa of Scrobipalpula patagonica Povolný (Lepidoptera: Gelechiidae: Gnorimoschemini). Scrobipalpula patagonica is a gall inquiline of Suaeda divaricata Moq. (Amaranthaceae) in the “Monte” region of Argentina. The habitus of S. patagonica is provided along with images of the semiarid habitat of its host plant and associated gall. The parasitoids known to attack S. patagonica are summarized.