Brachmia opaca is a moth in the family Gelechiidae. It was described by Edward Meyrick in 1927. It is found in China and Taiwan.
Adults are externally identical to Autosticha modicella and Autosticha truncicola.Park, K. T. & Wu, C. S. (2003). "A revision of the genus Autosticha Meyrick (Lepidoptera: Oecophoridae) in Eastern Asia". Insecta Koreana. 20 (2): 195-225.
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