Measuring biodiversity of large areas, such as entire countries or regions, is a difficult and costly process. One largely untapped and potentially useful source of biodiversity information is museum collections databases. But how does one go from a large database of collection records to a succinct description of biodiversity? This paper describes a number of ArcView GIS scripts that use a museum database to generate biodiversity information such as species/area counts, species area curves, endemicity plots, and species contours representing Central American freshwater fish.