Two species of Gelechioidea (Lepidoptera), Metharmostis multilineata Adamski, n. sp. (Cosmopterigidae), and Idiophantis soreuta Meyrick, 1906 (Gelechiidae), were collected in southeastern Asia for evaluation as potential biocontrol agents against downy rose myrtle, Rhodomyrtus tomentosa (Aiton) Hassk. (Myrtaceae), which has become an invasive weed in Florida, USA. Metharmostis Meyrick is reviewed and transferred from Yponomeutidae to Cosmopterigidae (Antequerinae). All life stages of M. multilineata are described and illustrated, with notes on its biology. In addition, protocols for rearing and host testing of M. multilineata are described in detail. Idiophantis appears to be associated with Myrtaceae, and the adult stage of I. soreuta is redescribed. Neither species was suitable for release in Florida.
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