Several species of Centris bees (Family: Anthoporidae) are known to occur sympatrically in many areas of the Costa Rican dry forest. In some areas, up to a dozen species of these solitary bees can be found together. Their “togetherness” stems from the various pollen and nectar resources they share and may compete for. The bees are considered one of the most important pollinator groups for a wide variety of plant species in the dry forest. Their importance is directly related to their high relative abundance and efficiency as outcrossing agents (Bawa, 1974; Frankie et al., 1976; Heithaus, 1979a bc; Frankie et al., 1983).