Bird's nests are specialized habitats that are inhabited by a diverse suite of invertebrates, such as insects, spiders, pseudoscorpions, and ticks. This study presents a list of gastropods found in birds' nests from Argentina for the first time. A total of 138 specimens of gastropods, belonging to 11 species, 10 genera and 8 families of snails were present in the nests of 42 birds from 6 families in 6 provinces in Argentina. Fifty eight specimens of the snail Pupisoma latens of different sizes were found alive in a nest, representing a new habitat for this species, which has been previously described from the aerial parts of trees. The remaining species were represented by dead specimens (fragments or empty shells), which can be tentatively attributed to bird diets. Among these, the most abundant species were Bulimulus bonariensis bonariensis and Succinea meridionalis, both as pre-adults. The nests Anumbius annumbi and Furnarius rufus from the province of Buenos Aires had the highest number of specimens. Freshwater snails (Heleobia parchappii, Biomphalaria sp., and Drepanotrema sp.) comprised 13% of the snail species found.

Los nidos de aves son ejemplos de hábitats ocupados por un conjunto de invertebrados, como insectos, arañas, pseudoescorpiones, etc. Por primera vez se presenta una lista de gasterópodos encontrados en nidos aviarios de la Argentina. Un total de 138 especímenes pertenecientes a 11 especies, 10 géneros y 8 familias fueron hallados en 42 nidos de 6 familias de aves en 6 provincias. Sólo Pupisoma latens, representado por 58 especímenes de diferentes tamaños, fue encontrado vivo en un nido, siendo un nuevo hábitat de la especie, previamente encontrada en partes aéreas de árboles. El resto de las especies estaban representadas por animales muertos (fragmentos o conchillas vacías), que podrían estar relacionados a la dieta de las aves. Entre estas, las especies con mayor número de representantes (mayoritariamente pre-adultos) fueron Bulimulus bonariensis bonariensis y Succinea meridionalis. Los nidos de Anumbius annumbi y Furnarius rufus de la provincia de Buenos Aires tuvieron el número más elevado de ejemplares de gasterópodos. Especímenes de gasterópodos de agua dulce (Heleobia parchappii, Biomphalaria sp. y Drepanotrema sp.) constituyeron 13 % del total.

The insect-host plants associations for 48 species of Cerambycidae (Coleoptera) from Buenos Aires province (Argentina) are summarized, including the previous records given in the literature, 12 associations in native plants (11 species of Cerambycidae in 6 species of plants) and 50 associations in exotic plants (18 Cerambycidae in 16 species of plants). To them are added the previous associations given for the Province of the Espinal, and the data now gathered of 6239 specimens (34 of Prioninae, 4564 of Cerambycinae, and 1641 of Lamiinae) belonging to 42 species of Cerambycidae reared from 108 species of plants. This last data includes 329 associations: 91 (27,6%) of them were found in native plants (36 species of Cerambycidae in 24 species of plants), and 240 (72,4%) in exotic plants (69 spp.) and some native plants (15 spp.) cultivated outs of its natural range (29 species of Cerambycidae in 84 species of plants). With the amount of localities of each insect- host plant association, the total number of associations increases to 501 records, 199 (39,8%) in native plants and 302 (60,2%) in exotic plants.

Se enumeran las asociaciones insecto-planta hospedadora para 48 especies de Cerambycidae (Coleoptera) de la provincia de Buenos Aires (Argentina), incluyendo los registros dados previamente en la literatura, 12 asociaciones en plantas nativas (11 especies de Cerambycidae en 6 especies de plantas) y 50 asociaciones en plantas exóticas (18 Cerambycidae en 16 especies de plantas). A ello se suman las asociaciones previamente dadas para la Provincia del Espinal y los datos ahora obtenidos de 6239 especímenes (34 de Prioninae, 4564 de Cerambycinae y 1641 de Lamiinae) pertenecientes a 42 especies de Cerambycidae criados de 108 especies de plantas. Estos últimos comprenden 329 asociaciones: 91 (27,6%) de ellas fueron encontradas en plantas nativas (36 especies de Cerambycidae en 24 especies de plantas) y 240 (72,4%) en plantas exóticas (69 spp.) y algunas plantas nativas (15 spp.) cultivadas fuera de su área natural (29 especies de Cerambycidae en 84 especies de plantas). Con la cantidad de localidades de cada asociación insecto-planta, el número total de asociaciones se incrementa a 501 registros, 199 (39,7%) en plantas nativas y 302 (60,3%) en plantas exóticas.

A situação taxonômica de Apterocaulus Fairmaire, 1864 e a validade de Apterocaulus heterogama heterogama (Burmeister, 1861) são discutidas. Apterocaulus heterogama durnfordii (Burmeister, 1879) é considerada como subespécie válida, sendo aceito os argumentos de Di Iorio (2002).

The taxonomic situation of Apterocaulus Fairmaire, 1864 and the validity of Apterocaulus heterogama heterogama (Burmeister, 1861) are discussed. Apterocaulus heterogama durnfordii (Burmeister, 1879) is considered as valid subspecies, being accepted Di Iorio's (2002) arguments.

Revision of 973 specimens of Heterachthes flavicornis (Thomson, 1865), mostly emerged from a same individual of different host plant species, shows that this species has a high phenotypical variation in the color of elytra, antennae and legs. This variability is not related to the geographical distribution or to the host plants. Heterachthes flavicornis sexsignatus (Thomson,1865), and Heterachthes flavicornis bonariensis (Thomson,1865) are considered into the synonymy of Heterachthes flavicornis (Thomson, 1865).