Heteralcis isochra is a moth in the family Lecithoceridae. It was described by Edward Meyrick in 1908. It is found in Assam, India. and Sri Lanka.Meyrick, Edward (1912–1916). Exotic Microlepidoptera. 1 (18): 569.
The wingspan is 12–14 mm. The forewings exhibit a light ochreous yellow color, adorned with four somewhat oblique, broad, and undefined fasciae that are darker, with a deeper ochreous or brownish suffusion. The first fascia is sometimes notably dark fuscous, while the second is the narrowest. The hindwings are also light ochreous yellow and feature a subdorsal groove that encloses a long pencil of ochreous-yellowish hairs.Journal of the Bombay Natural History Society. 18 (2): 444.
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