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In the Dept. de Antioquia, Colombia, Neocorynura pubescens is active throughout the year. Females collect pollen from weedy Compositae. Many nests in the banks of a small ditch were surprisingly similar in number of inhabitants, structure, manner of construction, and re-use to those of the strikingly different looking species, N. fumipennis, in Costa Rica. Mating presumably occurs in the nesting area; a clump of males prepared to pass the night on a perch in that area.

This papel contains descriptions of nests and information on seasonal cycles and social behavior of four halictine bees, Habralictus bimaculatus, Caenohalictus eberhardorum, Lasioglossum (Dialictus) seabrai, and L. (D.) breedi. Data are also included on two parasitic halictine bees, both of the genus Microsphecodes. The Habralictus and Caenohalictus nest in aggregations; individual nests are occupicd by one to several bees. There are no castes and within a nest containing two el more bees the relationships are communal or possibly quasisocial. The two species of Lasioglossum (Dialictus) nest in diffuse and often small aggregations. The colonies have mean populations of little over two bees, but there are weakly differentiated queens and workers, especially in L. seabrai. Activities were similar in both wet and dry seasons, so far as known. Este estudio ofrece descripciones de los nidos e información sobre los ciclos estacionales y sobre el comportamiento social de cuatro abejas halíctidas, Habralictus bimaculatus, Caenohalictus eberhardorum, Lasioglossum (Dialictus) seabrai. y L. (D.) breedi. También se incluyen datos sobre dos halíetidos parásitos, ambos del género Microsphecodes. Las especies Habralictus y Caenohalictus nidifican en agregaciones y los nidos individuales son ocupados por una o por varias abejas. No hay castas y dentro de un nido con dos o más abejas las relaciones son comunales o posiblemente cuasisociales. Las dos especies de Lasioglossum (Dialictus) nidifican en agregaciones a menudo disperas y pequeñas. Las colonias tienen un promedio de poco más de dos abejas, y hay reinas y obreras que se diferencian muy poco de las demás, especialmente en L. seabrai. Las actividades de las abejas parecen ser iguales durante la estación seca y la lluviosa.

Pauly ( 1984a) has recently named an African halictid as Paradialictus synavei, based on a single female specimen from Zaire. Because of the lack of a pollen-carrying scopa, we believe he was correct in assuming that this species is parasitic, although no behavioral data exist for it.