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The subgenus Chalepochile Gonzalez & Engel of Megachile Latreille was known only from males of two species. In this contribution the female of M. ardua Mitchell, type species of Chalepochile, is described, as well as a new species based on both sexes. The new species M. (Chalepochile) bilineata occurs in the provinces of Córdoba, La Rioja and Mendoza in Argentina. The phylogenetic relationships of the subgenus Chalepochile are discussed in the light of characters of the females. [ABSTRACT FROM AUTHOR]

The male and the female of a new species of Smicridea (Rhyacophylax) Müller (Hydropsychidae: Smicrideinae) collected near by El Palmar National Park, Entre Ríos Province, Argentina, are described. The males of this species are characterized by the presence of three points at the apex of the phallus, one dorsal and two lateral, and two lateral internal hooks. The females are easily distinguished by the characteristics of the vagina and the internal plate. [ABSTRACT FROM AUTHOR]

Male of Microcerella lalie sp. nov. from Santa Cruz, Argentina is described and illustrated and new records from Austral Argentinean Patagonia are provided for Microcerella mallochi (Hall). [ABSTRACT FROM AUTHOR]