Thyrocopa alterna
| Thyrocopa alterna | |
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| Species: | T. alterna
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| Binomial name | |
| Thyrocopa alterna Walsingham, 1907
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Thyrocopa alterna is a moth of the Xyloryctidae family. It is endemic to the Hawaiian islands of Maui and Hawaii.
The length of the forewings is 8–15 mm. Adults are on wing at least from May to November. It is very similar to Thyrocopa abusa, but the male antennae are surrounded by cilia, and the male genitalia are without a dorsal ridge. Individuals from Maui generally are smaller than those from Hawaii Island.