Tethea or
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Drepanidae
Genus:	Tethea
Species:	T. or
Binomial name
Tethea or (Denis & Schiffermüller, 1775)
Synonyms
Noctua or Denis & Schiffermüller, 1775 Noctua ypsilon-graecum Goeze, 1781 Noctua gamma-graecum Retzius, 1783 Noctua consobrina Borkhausen, 1790 Noctua octogena Esper, 1791 Phalaena (Noctua) gemina Beckwith, 1794 Tethea flavicornis Aurivillius, 1888 Palimpsestis or hela Rangnow, 1935 Tethea or nigrescens Werny, 1966 Palimpsestis rufa Houlbert, 1921 Cymatophora intermedia Houlbert, 1921 Palimpsestis kurilensis Matsumura, 1929 Palimpsestis akanensis koreibia Bryk, 1948

Tethea or, the poplar lutestring, is a moth of the family Drepanidae. It was first described by Michael Denis and Ignaz Schiffermüller in 1775. The species can be found in Europe, northern and eastern Asia and Japan. The imago resembles Tethea ocularis.

The wingspan is 38–43 mm. The moths flies from April to August depending on the location.

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  ♂
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The larvae feed on willow and poplar, mainly Populus tremula.

• Tethea or or (Europe to Turkey)
• Tethea or akanensis (Matsumura, 1933) (Japan)
• Tethea or terrosa (Graeser, 1888) (Russia, Korea, Mongolia, China: Heilongjiang, Jilin, Liaoning, Inner Mongolia, Beijing, Shanxi, Shaanxi, Ningxia, Gansu, Xinjiang)

• Poplar lutestring on UKMoths
• Lepidoptera of Belgium Archived 2016-07-14 at the Wayback Machine
• Lepiforum.de
• Vlindernet.nl (in Dutch)