The trefoil thick-horned tinea or large clover case-bearer (''Coleophora trifolii'') is a moth of the family Coleophoridae. It is found in Europe, North Africa, Asia Minor, Afghanistan and

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

. The wingspan is 15–20 mm. The forewings have a green metallic sheen.Adults are on wing from June to July. They are active during the day. The larvae feed from July to September on the seeds of '' Melilotus'' species (including ''

Melilotus albus ''Melilotus albus'', known as honey clover, white melilot (UK), Bokhara clover (Australia), white sweetclover (USA), and sweet clover, is a nitrogen-fixing legume in the family Fabaceae. ''Melilotus albus'' is considered a valuable honey plant ...

'', ''

Melilotus officinalis ''Melilotus officinalis'', known as sweet yellow clover, yellow melilot, ribbed melilot and common melilot, is a species of legume native to Eurasia and introduced in North America, Africa, and Australia. Description ''Melilotus officinalis'' ...

'' and ''

Melilotus altissima ''Melilotus altissimus'', known by the common names tall yellow sweetclover, tall melilot and golden melilot is a plant species of the genus '' Melilotus''. Pollinators Melilotus altissimus is a preferred food-plant of Bombus lucorum, B. terre ...

''). They enter

diapause In animal dormancy, diapause is the delay in development in response to regular and recurring periods of adverse environmental conditions.Tauber, M.J., Tauber, C.A., Masaki, S. (1986) ''Seasonal Adaptations of Insects''. Oxford University Press It ...

in nearby vegetation and pupate the following spring in the case.

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trifolii Moths described in 1832 Moths of Africa Moths of Asia Moths of Europe Moths of North America Taxa named by John Curtis {{Coleophoridae-stub