A3: Packer, L. 1985. Two social halictine bees from southern Mexico with a note on two bee hunting philanthine wasps (Hymenoptera: Halictidae and Sphecidae). Pan-Pacific Entomologist. 51:291-298.
Abstract: A nesting aggregation of Lasioglossum (Dialictus) exiguum and Halictus hesperus was discovered in the state of Chiapas, Mexico in January 1985. Both of these species are primitively eusocial with well developed morphological and physiological caste differentiation. H. hesperus has been studied in Costa Rica and Panama and details of the biologies of the different populations are compared. The social organisation of L. exiguum is compared with that of its close relative L. umbripenne. Philanthus gibbosus is recorded as a predator upon both halictine species and Trachypus gracilis preyed upon H. hesperus.