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Charaders of the adult, larva, and pupa of Nanodacna allstrocedrella Landry & Adamski, new species, are described and illustrated. The seed-feeding larvae cause damage to Andean Cedar, cipres de la cordillera [Austrocedrus chilcnsis (D. Don.) Fl. & Bout., Cupressaceae] in Chubut Province, Argentina. The species is compared to other species of Nanodacna and to species of Hornoeoprepes Walsingham from the Neotropics. Criteria for its inclusion in Nanodacna and the phylogenetic Significance of characters of immature stages for relationships within the Agonoxeninae are discussed.