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The bee fly Toxophora aurea Macquart is reported for the first time in Argentina. One single specimen of this species was reared from a nest of Isodontia costipennis (Spinola) (Hymenoptera: Sphecidae) in the province of Formosa and others were captured in southern Misiones province, and others housed in entomological collections from the provinces Chaco, Santiago del Estero and Santa Fe. Data about the biology of Toxophora leucon Séguy from individuals reared in nests of Cyphomenes anisitsii (Brèthes), Pachodyneurs guadulpensis (Saussure) and Zethus dicomboda (Spinola) (Hymenoptera: Vespidae: Eumeninae) in the province of Formosa are also reported. These are the first data about the reproductive ecology of these parasitic flies in Argentina. [ABSTRACT FROM AUTHOR]

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In an attempt to publicize and increase the limited knowledge on the species of Actinote (Acraeini) in Argentina, data and photographs of various biological and ecological aspects of five species of this genus are presented, with a special focus on the northeastern part of Buenos Aires Province. A new record for that province, Actinote surima (Schaus, 1902), is also presented. [ABSTRACT FROM AUTHOR]

The Trichoptera fauna from Las Yungas from northwestern Argentina and southern Bolivia is poorly known. There are 30 Neotropical species in the genus Marilia Müller, but only in four have the adults been associated with the immature stages in spite of their abundance and ecological importance. In this study, the male genitalia of M. cinerea Navás is re-described and illustrated to complete the original description. The immature stages of M. cinerea and M. elongata Martynov were associated using the metamorphotype method. Illustrations, descriptions and biological observations are included. M. cenerea is a new record for Bolivia and new localities in northwestern Argentina. M. elongata and M. flexulosa Ulmer were registered for the first time for northwestern Argentina. [ABSTRACT FROM AUTHOR]

The worker of Myrmelachista gallicola Mayr is redescribed and mentioned for the first time for La Pampa province (Argentina). The material studied was integrated by workers and was collected on Prosopis caldenia Burkart (Fabaceae) at Santa Rosa, La Pampa within galls of Tetradiplosis sp. (Diptera: Cecidomyiidae). [ABSTRACT FROM AUTHOR]