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New records of Myrmeleontidae from Paraguay are presented: Dimares elegans (Perty, 1833), Glenurus croesus Banks, 1922, Glenurus penningtoni (Navás, 1918a) and Vella fallax (Rambur, 1842). The total number of species now recorded from the country is fourteen among 11 genera. Specimens of Dimares elegans from east (Cerrado) and west (Chaco) of the Paraguay River are phenotypically distinct; those west of the Paraguay River are assigned to the form “lepida” Navás, 1912. More research is required to understand the taxonomic limits in this genus.
Descriptions or diagnoses are given for 36 species of New World Eremoleon including 12 new species:
Eremoleon attenuatus, E. durangoensis, E. jacumba, E. jamaica, E. inca, E. monagas, E. morazani, E. pygmaeus, E. samne, E. tanya, E. tepuyiensis and E. venezolanus. A neotype is designated for Hesperoleon atomarius Navás 1933.
The larvae of 25 species are described and keyed. Keys to the adults and larvae are given, and biological notes are provided. Twenty-five species were reared from larvae found in cave mouths, rock overhangs, or other less common habitats; for example, E. nigribasis were found in deep recesses of mammal burrows, E. gracile were reared from reptile holes in the ground, E. punctipennis were found in beetle frass beneath logs, and E. femoralis in small twig holes or abandoned termite galleries in termite frass. Many new bombyliid and chalcidid parasites are listed.