Abstract Macaria kruegeri Vargas, Hausmann & Parra sp. nov. is described and illustrated based on adults reared from larvae collected on the shrub Adesmia spinosissima Meyen (Fabaceae) at about 3200 m elevation in the Andes of northern Chile. Macaria kruegeri resembles Macaria alba (Bartlett-Calvert, 1893), described from southern Chile. However, the two species can be accurately separated based on subtle differences in wing pattern and the shape of the valvula of the male genitalia. In addition, there is a DNA barcode divergence (COI gene) of 4.9% between both taxa.

Prey identification in nests of the potter wasp Hypodynerus andeus (Packard) (Hymenoptera, Vespidae, Eumeninae) using DNA barcodes. Geometrid larvae are the only prey known for larvae of the Neotropical potter wasp Hypodynerus andeus (Packard, 1869) (Hymenoptera, Vespidae, Eumeninae) in the coastal valleys of the northern Chilean Atacama Desert. A fragment of the mitochondrial gene cytochrome oxidase c subunit 1 was amplified from geometrid larvae collected from cells of H. andeus in the Azapa Valley, Arica Province, and used to provide taxonomic identifications. Two species, Iridopsis hausmanni Vargas, 2007 and Macaria mirthae Vargas, Parra & Hausmann, 2005 were identified, while three others could be identified only at higher taxonomic levels, because the barcode reference library of geometrid moths is still incomplete for northern Chile.

Three species of geometrid moths are reported from the extreme North of Chile. All three are new for the Chilean fauna: Scopula umbilicata (Fabricius, 1794) (Sterrhinae), Cataspilates grisescens Warren, 1897, and Pero obtusaria Prout, 1928 (Ennominae).

Tres especies de Geometridae son reportadas para el extremo norte de Chile. Todas son nuevas para la fauna chilena: Scopula umbilicata (Fabricius, 1794) (Sterrhinae), Cataspilates grisescens Warren, 1897, y Pero obtusaria Prout, 1928 (Ennominae).

A new ennomine species (Geometridae: Ennominae: Macariini) is described from northern Chile: Macaria mirthae sp. nov. Morphology of male and female genitalia of M. mirthae indicates close relationship to Macaria abydata Guenée, 1858. The latter species is widely distributed in the Neotropical and Indo-Pacific regions. Both species can be easily distinguished on the basis of habitus features and male and female genitalia. Larval stages of the new species M. mirthae are associated with Acacia macracantha Humb et Bonpl ex Willd., Prosopis tamarugo Phil. and Geoffroea decorticans (Gill ex Hook et Arn.) Burkart (Fabaceae) in the north of Chile.

Se presenta una descripción del adulto de Macaria mirthae sp. nov. (Geometridae: Ennominae: Macariini) sobre la base de ejemplares colectados en el norte de Chile. La morfología genital del macho y de la hembra de M. mirthae es muy similar a la de Macaria abydata Guenée, 1858, especie ampliamente distribuida en el Neotrópico y en la región Indo-Pacífica. Sin embargo, ambas pueden ser fácilmente separadas. Los estados inmaduros de M. mirthae están asociados a Acacia macracantha Humb et Bonpl ex Willd., Prosopis tamarugo Phil. y Geoffroea decorticans (Gill ex Hook et Arn.) Burkart (Fabaceae) en el norte de Chile