Abstract
The Mesoamerican Mesorhaga Schiner are revised, illustrated and keyed, and include twelve species, ten of them newly described: Mesorhaga lacrymans Parent (Costa Rica and Panama), M. cocori n. sp., M. hule n. sp., M. sarukhani n. sp., M. baadsvicki n. sp., M. villanuevi n. sp. (all Costa Rica), M. isthmia n. sp. (Costa Rica, Panama, Nicaragua, El Salvador, and Mexico), M. adunca (Van Duzee) (Guatemala), M. mexicana n. sp., M. falciunguis n. sp., M. minatitlan n. sp., and M. nayaritensis n. sp. (all Mexico). A checklist of the New World Mesorhaga fauna is provided along with notes on selected species. M funebris Parent from the tropical Andes is redescribed and the male postabodomen of M. caudata Van Duzee from Georgia, U.S.A. is illustrated.
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