Notoreas galaxias is a species of moth in the family Geometridae. This species is endemic to New Zealand and has been observed in the southern half of the South Island. The species inhabits alpine herbfields and their larvae feed on species in the genera Kelleria and Drapetes. The adults are on the wing February to March.
This species was described by George Hudson in 1928 using material collected in February 1906 in the Old Man Range / Kopuwai in Central Otago at an elevation of about 1200 metres by J. H. Lewis. The genus Notoreas was reviewed in 1986 by R. C. Craw and the placement of this species within it was confirmed. However this species may be of dubious taxonomic status. The holotype specimen is held at the National Museum of New Zealand Te Papa Tongarewa.
Hudson described the species as follows:
This species is endemic to New Zealand. It has been found in Central Otago at its type locality of Old Man Range as well as in the Dansey Ecological District and at Slate Basin and Symmetry Peak in the Eyre Ecological District.
This species is on the wing in February and March.
Notoreas galaxias prefers herbfield alpine habitat. Larvae of this moth have been found to feed on species in the Kelleria and Drapetes genera.