Thereus brocki is a species of butterfly of the family Lycaenidae. It found from eastern Colombia to eastern Peru. The habitat consists of wet forests up to about 1,000 meters elevation.
Etymology The species is named for James Brock of Tucson, Arizona who collected the holotype.Male secondary sexual structures and the systematics of the Thereus oppia species group (Lepidoptera, Lycaenidae, Eumaeini)
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