RESUMO O comportamento de oviposição da rara borboleta Minstrellus grandis (Lepidoptera: Riodinidae) é registrado pela primeira vez. Duas fêmeas depositaram ovos sobre folhas velhas de uma Triplaris (Polygonaceae) não identificada, uma planta mirmecofítica conhecida popularmente como ‘pau-formiga’ ou ‘novateiro’, habitadas por formigas ‘taxi’ agressivas do gênero Pseudomyrmex (Hymenoptera: Formicidae). Estas observações sugerem que as lagartas de M. grandis vivem associadas com um dos mais perigosos tipos de simbiose formiga-planta da Amazônia.

ABSTRACT The oviposition behavior of the rare butterfly Minstrellus grandis (Callaghan, 1999) (Lepidoptera: Riodinidae) is recorded for the first time. Two females laid eggs on the old leaves of an unidentified Triplaris Loefl. ex L. (Polygonaceae), a myrmecophytic plant typically known as ‘Triplaria’ or ‘novice’ tree, inhabited by aggressive ‘taxi’ ants of the genus Pseudomyrmex Lund. 1831 (Hymenoptera: Formicidae). These observations suggest that M. grandis caterpillars live associated with one of the most harmful types of Amazon ant-plant symbiosis.

The immature stages (egg, larva, and pupa) morphology, larval and oviposition behavior, and host plant of the "eighty-eight" butterfly Diaethria clymena janeira (C. Felder, 1862) are described. Eggs are laid singly under leaf, and have pronounced vertical ribs ending up in a crown. Larvae of early instars construct stick-like frass chains where they rest when not feeding. Late instars are green with reduced body scoli and long branched head scoli. Pupae are entirely green, and pupation occurs on the upper leaf surface. In general, morphology and behavior of immature stages are similar to those of related species in the tribe Callicorini.

Os estágios imaturos da borboleta Magneuptychia libye (L.) são descritos, e sua morfologia é comparada com a de outros Satyrinae Neotropicais.

The immature stages of the butterfly Magneuptychia libye (L.) are described, and their morphology is compared with other Neotropical Satyrinae.

As estruturas externas do ovo, larva e pupa de Dryadula phaetusa (Linnaeus, 1758) são descritas e ilustradas, baseadas em microscopia óptica e eletrônica de varredura.

The external features of egg, larva and pupa of Dryadula phaetusa (Linnaeus, 1758) are described and illustrated, based upon light and scanning electron microscopy.

As estruturas externas do ovo, larva e pupa de Dione moneta moneta Hübner, 1825 são descritas e ilustradas, baseadas em microscopia óptica e eletrônica de varredura.

The external features of the egg, larva and pupa of Dione moneta moneta Hübner, 1825 are described and illustrated, based upon light and scanning electron microscopy.

É registrado pela primeira vez o lepidopterismo provocado pela mariposa Hylesia nigricans (Berg) para o sul do Brasil. São apresentados alguns aspectos da biologia da espécie e relatadas medidas como estratégia preventiva de controle.

Lepidopterism by Hylesia nigricans (Berg) moth is recorded for the first time in southern Brazil. Preventive strategies of control are proposed based on information on the biology and ecology of this moth.

As estruturas externas do ovo, larva e pupa de Agraulis vanillae maculosa (Stichel, [1908]) são descritas e ilustradas, baseadas em microscopia óptica e eletrônica de varredura.

The external features of egg, larva and pupa of Agraulis vanillae maculosa (Stichel, [1908]) are described and illustrated, based upon light and scanning electron microscopy.

Utilizando-se da microscopia de luz e de varredura, são descritos e ilustrados os ovos dos seguintes Heliconiini (Lepidoptera, Nymphalidae) do Rio Grande do Sul (Brasil): Agraulis vanillae maculosa (Stichel, 1907), Dione juno juno (Cramer, 1779), Dione moneta moneta Hübner, 1825, Dryadula phaetusa (Linnaeus, 1758), Dryas iulia alcionea (Cramer, 1779), Philaethria wernickei (Röber, 1906), Eueides isabella dianasa (Hübner, 1806), Eueides aliphera aliphera (Godart, 1819), Heliconius ethilla narcaea Godart, 1819, Heliconius besckei Ménétriés, 1857 e Heliconius erato phyllis (Fabricius, 1775). Com base em diferenças morfológicas genéricas e ultraestruturais, associadas aos padrões de uso das plantas hospedeiras, elaborou-se uma chave dicotômica para a identificação das espécies.

Based upon light and scanning electron microscopy, the external morphology of the egg stage is described and illustrated for the following Heliconiini (Lepidoptera, Nymphalidae) from Rio Grande do Sul State, Brazil: Agraulis vanillae maculosa (Stichel, 1907), Dione juno juno (Cramer, 1779), Dione moneta moneta Hübner, 1825, Dryadula phaetusa (Linnaeus, 1758), Dryas iulia alcionea (Cramer, 1779), Philaethria wernickei (Röber, 1906), Eueides isabella dianasa (Hübner, 1806), Eueides aliphera aliphera (Godart, 1819), Heliconius ethilla narcaea Godart, 1819, Heliconius besckei Ménétriés, 1857, and Heliconius erato phyllis (Fabricius, 1775). A dichotomic key is provided for their identification, based upon differences at the levels of generic and ultrastructural morphology, and variation in host-plant use.

The external features of egg, larva and pupa of Dryas iulia alcionea (Cramer, 1779) are described and illustrated.

The external features of egg, larva and pupa of Dione juno juno (Cramer, 1779) are described and llustrated, based upon light and scanning electron microscapy.

The externaifeaturesof egg, larvaandpupa of Heliconius erato phyllis (Fabricius, 1775) are described and illustrated, based upon light and scanning electron microscopy.