What physical marker gives the White-shouldered House Moth its common name?
Answer
The shoulders, or the base of the forewings, are notably white.
The common name, White-shouldered House Moth, directly points to a distinctive morphological feature of the adult insect. Specifically, the region corresponding to the shoulders—which is the proximal area where the forewings attach to the body—is distinctly white in coloration. This contrasts with the rest of the forewing, which is a pale creamy white but overlaid with irregular, dusky or greyish-brown speckles and streaks, creating a mottled look. While the hindwings are paler and semi-transparent, and the larvae have dark heads, it is the prominent white color at the base of the forewings that inspired the common nomenclature for *Endrosis sarcitrella*.
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