Duas espécies novas de Anthidiinae do Brasil (Hymenoptera, Megachilidae) Two new species of Anthidiinae from Brasil (Hymenoptera, Megachilidae)

<abstract language="eng">Saranthidium marginatum, sp.n. from Brazil (Minas Gerais and Parana) and Argentina (Misiones) and Hypanthidium erythrogaster, sp.n. from Brazil (Bahia, Espirito Santo, Rio de Janeiro, Minas Gerais and Mato Grosso do Sul) are described

Rhynosteus, gen.n. e notas sobre Hoplostelis Dominique (Hymenoptera, Apoidea, Megachilidae) Rhynostelis,gen.n. andtaxonomic notes on Hoplosteus Dominique (Hymenoptera, Apoidea, Megachilidae)

<abstract language="eng">Rhynosielis, gen.n. is proposed as new genus for Anthidium multiplicaium Smith, 1879. It has in commom wilh Hoplostelis a strong basal tooth on upper border of mandibles. Main differences with Hoplostelis are: mandibular shape, configuration of mandibular teeth on apical border, a rounded tubercule on upper clypear third, mesoscutum posteriorly bigibbous, scutellum transverse-bigibbous, preepisternal carina laminate and almost complete, basal portion of propodeum without foveae and a median carina on last three terga

Biologia e ecologia de Anthodioctes moratoi Urban (Hymenoptera, Megachilidae, Anthidiini) em matas contínuas e fragmentos na Amazônia Central, Brasil Biology and ecology of Anthodioctes moratoi Urban (Hymenoptera, Megachilidae, Anthidiini) in continuous forests and forest fragments in Central Amazonia, Brazil

<abstract language="eng">Anthodioctes moratoi Urban, 1999 was described based on specimens collected in tlhe state of Amazonas during a study of the ecology of trap-nesting bees and wasps. Sampling was done between 1988 and 1990 north of Manaus, in areas of the "Forest Fragment Biological Dynamics Project". Wooden trap-nests were set in different heights inside continuous forests, forest fragments of different sizes, natural gaps inside continuous forest, and in cleared areas between forest fragments. A total of 61 nests were collected from which 33 males and 46 females emerged. The majority of nests was collected in continuous forests, at 15 m height, in holes 4.8 mm in diameter. No nest was collected in cleared areas. There was no correlation, neither between number of nests and monthly precipitation, nor between the monthly number of nests constructed in the two consecutive years. No nest was constructed between January and June 1989. Overall, this coincided with the period of least activity of other trap-nesting bees in the studied areas. The nests consisted of a linear series of brood cells with walls made of resinous material mixed with small wood chips. The average length of the provisioned cell was 13,4 mm. Half of this length was occupied by a pollen mass. The number of provisioned cells varied between two and nine. In 52% of the nests there was brood mortality in at least one cell. The phorid fly Phalacrotophora (Omapanta) sp. was the only nest associate, emerged, from just one cell