Observations on Nests of Ceratina in Costa Rica (Hymenoptera, Apoidea)

Abstract

Ceratina ignara appears to be active and probably provisions nests throughout the year although all the nests studied were found in March. The principal features of the nest that differ from those of certain other species of Ceratina are as follows: no very long cells, empty cells or double partitions between cells; partitions concave below, not aboye; pollen mass firm, concave on outrer surface, with margins not amate; thickness of pollen mass rather uniform. The principal features of the nest of C. (Ceratinula) sp. that differ from those of certain other species are: very short cell series suggesting construction of two or more nests by each female; no very long cells, few empty cells or double partitions; partitions very thin and slightly concave on both surfaces; polien mass firm, scarcely longer than broad, margins rounded.