Eupithecia nahuelbuta is a moth in the family Geometridae. It is found in the region of Araucania (the Province of Malleco) in Chile., 1987, The Eupithecia (Lepidoptera, Geometridae) of Chile. Bulletin of the American Museum of Natural History 186 (3): 269-363. The habitat consists of the Northern Valdivian Forest Biotic Province.
The length of the forewings is about 9 mm. Adults have been recorded on wing in February.
Etymology The specific name is based on the type locality.
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