Abstract
Abstract In northwestern Costa Rica, Agelaia yepocapa (Richards) nests in cavities within living hollow trees in lower montane mesic forests; A. panamaensis (Cameron) nests in very large cavities in premontane gallery forests. Nests of both species have vertical combs with horizontal cells that face outward from the nest center; the nests have no enclosing envelope. In January 1996, an A. yepocapa colony was in full brood production, while an A. panamaensis colony was in the last stage of colony decline, and a nearby A. panamaensis colony had terminated only weeks before. The appearance of a small aggregation of A. panamaensis in a montane cloud forest site, too small to support a colony as large as those that had recently reached the end of a colony cycle in a nearby premontane gallery forest, suggests that the colony cycle of A. panamaensis in northwestern Costa Rica has a seasonal pattern that includes elevational migration and possible non-nesting quiescence at cool high elevations. Morphometric contr...
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