Species richness, evenness, and diversity of the insects visiting coffee flowers were studied under four different management regimes, at the peak of the blooming season of 2004. Floral visitors were censused four times at each site. Species richness, measured as Margalef Indexes, was lower for unshaded and specialized shaded coffee plantations, on the one hand, and higher for rustic (organic) and commercial policulture plantations on the other hand. Diversity, measured as Shannon-Weaver Indexes was below 0.70 for all sites; it was highest for the rustic site, intermediate for the unshaded and commercial policuture sites and low for the specialized shade site. Equitability values were low (between 0.15 and 0.31) for all sites, due to the disproportionate abundance of honeybees in the censuses. This abundance is explained by the introduction of managed beehives to the study area during the main blooming period of coffee, a common practice for Mexican beekeepers. Insect visitors other than honey bees were different for the different sites.