Abstract
Chrysobasis is synonymized with Leptobasis. The latter is diagnosed by the combination of rounded frons, CuP reaching hind margin of wing, CuA relatively short, and supplementary pretarsal claw reduced to vestigial, and by the presence on the distal segment of the genital ligula of a pair of chitinized, flap-like, movable processes directed posteriorly. A new species from Peru, L. mauffrayi, is described, and illustrations, maps, and keys for all Leptobasis species are provided.References
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